HP C2488A, C2486A, C2490A Technical Reference Manual

HP

C2486Aj88Aj90A

3.5-inch

Technical

SCSI-2 Disk Drives

Reference

Manual

Fli;-

~~

HP

Printed in U.S.A. September 1992

DRAFT 1/18/93

HEWLETT

PACKARD

Part No. xxxx-xxxx

Edition 1

09:58

Printing

History

This manual will be revised without notice in order it

describes. New editions are complete revisions of

change only when a new edition is published. Many

product

may be done

Edition 1

updates

without

.................................................................

do

not

require manual changes and, conversely, manual corrections

accompanying product changes.

to

the

reflect

manual.

the

latest

The

version of

dates

on

the

product

the

title

page

September 1992

DRAFT

1718/93 09:58

iii

Contents

1.

Product Product Key Features . . Interface Options . Specials Related Documentation Disk Drive Capacities . Operating DC Power Characteristics Environmental Requirements

Specifications Description

.....

Specifications

1-1 1-1

1-2 1-2 1-2

1-4 1-6 1-9

1-10

Product

2. Introduction

Handling Guidelines . . . . . . . .

Protection Protection

Unpacking

Inspecting Inspecting Recording

Disk Drive

Return

Re-Packing For Shipment

Mounting Information . . . . . . . .

Safety Chassis Dimensions Physical Mounting

Airflow Requirements . . . . . . . .

Front Panel LED Indicator . . Address

Drive To Interface Connections . . . .

Interface Connectors

Connector Dimensions

SCSI Connector

DC

Mating

Cabling Requirements

Installation

. . . . . . . . . . .

From Mechanical Shock from Electrostatic Discharge (ESD)

the

Disk Drive

the

Shipping Container

the

Disk Drive

the

Serial Number

Returns

Shipment Addresses Vendor Purchases Hewlett- Packard Direct Purchases .

/Regulatory

and

Configuration Pin-Set Set-ups

Power Connector

Connector Requirements

Single-ended Cable Differential Cable .

. . . . .

Compliance . . .

and

......

.....

....

and

Mounting Screw Locations

Cables

and

Locations

..

. . . .

.

2-1

2-2

2-3

2-5 2-5 2-5 2-5 2-5

2-6 2-6

2-8

2-9 2-9 2-9 2-9

2-9

2-10 2-10

2-10

DRAFT

1/18/93

09:58

Contents-1

3.

Product Features

Introduction Functional Description .

Disk

Format Sector Addressing Error

Track Sparing

Head Alignments

Command

Synchronized

Assembly

Head/Disk

Block Diagram

SCSI Interface RAM Buffer Disk Controller Data Microcontroller Servo Processor . Data Actuator Servo Spindle Power Distribution

Format

Structure

Correction Code

Cyclic Redundancy Check

Look Ahead Reads

Head Alignment Head Alignment Modes Typical Head Alignment Times

Queuing

Error

Recovery

Descriptions .

Assembly Disks Heads Actuator Head Interface Electronics Atmospheric Controls Vibration Isolators Spindle Assembly

Encoder/Decoder

Head Interface

and Latch Assembly

Driver

Timing

Motor

(CRC)

States

Spindle Operation

.

Driver

.-

3-1 3-1 3-1

3-1

3-1 3-1 3-2 3-2 3-2 3-3 3-3 3-3 3-4 3-4 3-6 3-6

3-6

3-6 3-6 3-7 3-7 3-7 3-7 3-7 3-7 3-8 3-8 3-8 3-8 3-8 3-8

3-9

3-9 3-9 3-9

3-9

4.

SCSI Interface

Introduction Supported Functions Status

SCSI Message Support .

Contents-2

Byte

Target

Message Command

lllegal Messages .

Reselection

Error

Out

or

Conditions

Phase

Data

Timeout

Parity

Out

.

Error

Phase

Parity

Error

4-1 4-1 4-6 4-7 4-8 4-8

4-8

DRAFT

1/18/93 09:58

A.

SCSI

Command

Command Control

Change Format

Byte

Descriptions

Details .

Definition.

Unit A-7 Inquiry Mode Select, -Mode Sense Read A-31 Read Buffer Read Capacity A-33

Data

Read Defect

. A-34 Read Long A-36 Reassign Blocks . Receive Diagnostic Results A-39 Release Request

Sense A-42 Reserve Rezero

Unit A-49

Seek.

Diagnostic

Send Start/Stop Synchronize

Unit Ready A-55

Test

Unit

Cache

Verify Write Write Write Write Write

And Verify Buffer Long. Same

A-I A-I A-2 A-6

A-ll A-15

A-32

A-37

A-41

A-48

A-50 A-51 A-53 A-54

A-56 A-57 A-59 A-60 A-62 A-63

B. Vendor Unique

Command

Access

Log. Change SCSI ID Change Execute Interface Manage Media

Test. Read Full Read Headers Reformat Track . Write Full

DRAFT

1/18/93 09:58

Command

Descriptions

Wide SCSI ID

Data.

Control

Primary

Descriptions

B-1 B-2 B-7 B-8

B-9 B-I0 B-ll B-16 B-18 B-20 B-21 B-22

Contents-3

C. Vendor Unique Status Codes

D.

Reference

E. Narrow, Single-Ended Drive Configurations

Terminator Power Source

Options.

. . . .

Index

E-4

Contents-4

DRAFT

1/18/93 09:58

Figures

1-1. Disk Drive Major Components 1-3

Single-Unit Packaging . . . . 2-3

2-1.

2-2. Ten-Unit Packaging . . . . . 2-4

3-1. Disk Drive Addressing Structure 3-2. Formatted Physical Sector Allocation 3-14

3-3. Disk Drive Block Diagram . . . . . 3-15

E-1. Narrow, Single-Ended: Disk Drive Dimensions and Mounting Locations E-2. Narrow, Single-Ended: Interface, Address and Option Connectors E-2

..

E-3. Narrow, Single-Ended: Connector Dimensions E-4. Narrow, Single-Ended: Temperature Measuring

. . E-5

Points.

. . . . E-6

Tables

3-10

E-l

1-1. HP C2486A/88A/90A SCSI Disk Drive Capacities

1-2.

HP

C2486A/88A/90A Operating Specifications . . 1-3. HP 1-4. 2-1. Address/Configuration 2-2. Address/Configuration 2-3. Recommended Mating Connectors 3-1. 4-1. HP C2486A/88A/90A Supported SCSI Commands

A-I. Supported SCSI-2 Commands

B-1. Vendor Unique Commands C-1. Vendor Unique

D-1. Reference Appendix Contents

E-l.

E-2. Narrow, Single-Ended: On-Board Terminator Power (TermPwr)

E-3. Narrow, Single-Ended: SCSI Connector Pin Assignments

C2486A/88A/90A DC Power Characteristics .

HP

C2486A/88A/90A Environmental Requirements

Pin-Set Information Locations Option Descriptions

......

C2486A/88A/90A Cylinder

DERROR

Narrow, Single-Ended: Address and Option Connector Configurations

Allocation.

...

.....

Status

Codes

....

. . .

. .

.

..

.....

Sources

1-4 1-6 1-9

1-10

2-6

2-7

2-9

3-11

4-4

A-3

B-1 C-l

D-l

E-3 E-4

.

E-5

DRAFT

1/18/93 09:58

Contents-5

Product Specifications

Product Description

The

HP

C2486A/88A/90A single-ended and differential disk drives are reliable, low cost,

high capacity, high performance, random access mass storage devices. Each

The

sputtered thin-film 3.5-inch (95 mm) disks as storage media. is compatible with 1-1

shows

the

major

industry

components of

standard

Small Computer System Interface (SCSI-2). Figure

the

disk drive.

disk drive electrical interface

product

1

utilizes

These drives incorporate an advanced Digital provides alignment of an embedded servo system. High capacity and fast average transfer rates are achieved with Multiple Zone Recording.

The

Capacities Operating Specifications DC Power Characteristics Environmental Requirements

the

flexibility and performance of a dedicated servo system

product specifications are listed in

............................................

.........................................................

........................................................

....................................................

Signal Processor

the

following tables:

(DSP)

.-

..........................

hybrid servo design

and

the

dynamic head

Table Table 1-2 Table 1-3 Table 1-4

Key Features

• High reliability (500,000 hours

• Synchronous

• Digital Signal Processor (DSP) hybrid servo sytem.

• High performance HP-designed balanced

•

Industry

• Fast and Wide Embedded SCSI-2 controller.

• Powerful HP-designed Reed-Solomon ECC.

data

standard

transfer

3.5-inch form factor and voltage requirements.

rate

MTBF).

of up

to

20

megabytes per second.

actuator.

that

1-1

DRAFT

1/18/93

09:58

Product Specifications 1·1

Interface Options

The

following interface options are available:

Interface

001

002 012

Option

Description

SCSI-2 Fast, Narrow, Single-Ended SCSI-2

Fast, Narrow, Differential

SCSI-2 Fast, Wide, Differential

Reference Appendix

E

F

'.

G

Specials

For customer needs can provide specially modified products. These modifications are ordered, defined, engineered, and

manufactured under "special" contract negotiations.

that

differ from

the

products described in this manual, Hewlett-Packard

Related Documentation

The

following documentation provides information related

C2486A/88A/90A disk drives:

• Small Computer Systems Interface:

II

Common Command Set (CCS)

ANSI

XT39.2/86-109 (Rev 10h), XT39/89-042

of

the Small Computer System Interface (SCSI):

XT39.2/85-52 (Rev 4B)

to

the

operation of

the

HP

ANSI

1-2 ProductSpecifications

DRAFT

1/18/93 09:58

w3101

Figure 1·1. Disk Drive Major Components

DRAFT Product Specifications 1/18/93 09:58

1·3

Disk

Drive

Capacities

Table 1·1.

HP

C2486A/88A/90A SCSI Disk Drive Capacities

These

nuniliers

are

for

comparison

only. Capacities

are

calculated

using

a 512-byte sector.

When

other

sector

sizes

are

used,

formatted

capacities will change.

Unformatted

capacities

are

given

in

parenthesis ( ).

Zone

0

Zone

1 .

Zone

2

Zone

3

Zone

4

Zone

5

Zone

6

(Outer)

Data

Tracks

per

Surface:

478 171 136 150 140 178

144

Data

Sectors

per

Track:

116 112 108

104

100

96

92

Data

Bytes

per

Track:

59,392

57,344

55,296 53,248

51,200 49,152

47,104

(71,572) (69,104) (66,636) (64,168)

(61,700) (59,232)

(56,764)

Data

Sectors

per

Cylinder:

C2486A 1,276 1,232 1,188 1,144 1,100

1,056 1,012

C2488A

1,624

1,568 1,512 1,456

1,400 1,344 1,288

C2490A

1,972 1,904 1,836 1,768 1,700 1,632 1,564

Data

Bytes

per

Cylinder:

C2486A 653,312 630,784 608,256 585,728 563,200

540,672

518,144

(787,292)

(760,144) (732,996)

(705,848) (678,700) (651,552)

(624,404)

C2488A

831,488

802,816 774,144 745,472

716,800

688,128

659,456

(1,002,008) (967,456) (932,904) (898,352)

(863,800)

(829,248) (794,696)

C2490A 1,009,664

974,848 940,032 905,216 870,400 835,584

800,768

(1,216,724) (1,174,768) (1,132,812) (1,090,856) (1,048,900) (1,006,944)

(964,988)

C2486A

C2488A

C2490A'

Data

Surfaces

per

Drive:

11

14 17

Data

Bytes

per

Sector:

512 (617) 512 (617)

512 (617)

Data

Sectors

per

Surface:

230,168 230,168 230,168

Data

Bytes

per

Surface:

117,846,016 117,846,016 117,846,016

Data

Cylinders

per

Drive:

1

2,467 2,467 2,467

Data

Sectors

per

Drive:

2,531,848 3,222,352

3,912,856

Data

Bytes

per

Drive:

1,296,306,176

1,649,844,224

2,003,382,272

(1,562,150,216)

(1,988,191,184) (2,414,232,152)

...

Notes:

1.

There

are

2531

total

cylinders

per

drive,

allocated

as

follows: 2467

data

cylinders, 63

spare

cylinders,

and

2

cylinders

reserved

for

logs

and

maintenance

infonnation.

Partial

cylinders

have

been

rounded

to

the

number.

Refer

to

Chapter

3,

Table

3-1 for a complete cylinder

allocation

list.

(continued

on

1·4

Product SpecHications

DRAFT

1/18/93 09:58

These sizes

Data Data Data

Data

numbers

are

used,

Tracks Sectors Bytes

Sectors

Bytes

Table 1-1.

are

for

comparison

formatted

per

Surface:

per

Track:

per

Track:

per

Cylinder:

C2486A 968 924 C2488A C2490A 1,496 1,428 1,360 1,292 1,224

per

Cylinder:

C2486A 495,616 473,088 450,560 428,032 405,504

HP

C2486A/88A/90A

only.

capacities

will change.

(597,256) (570,108)

SCSI

Capacities

Zone

152

88

49,056 43,008

(54,296) (51,828)

1,232

Unformatted

7

Zone

are

148

84

1,176

calculated

Disk Drive Capacities (continued)

using a 512-byte

capacities

8

Zone

146

40,960

(49,360) (46,892) (44,424) (41,956)

880 836

1,120 1,064 1,088 952

(542,960)

are

Zone

9

80 76

38,912 36,864

(515,812) (488,664) (461,516)

given in

10

136

sector.

When

parenthesis ( ).

Zone

11

164

72

792

other

sector

12

Zone

(hIDer)

180

64

32,768

(39,488)

704 896

1,088

(434,368)

Zone

144

68

34,816

748

1,156

382,976 360,448

13

Notes:

1.

There cylinders whole

are

2531

reserved

number.

C2488A 630,784 602,112 573,440

(760,144) (725,592) (691,040) (656,488)

765,952

(923,032) (881,076) (839,120)

per

drive,

maintenance

3,

Table

731,136

allocated

information.

3-1 for a

as

follows: 2467

complete

total

for

Refer

C2490A

cylinders

logs

and

to

Chapter

544,768 516,096 487,424 458,752

696,320 661,504

(797,164) (755,208)

dMa

Partial

cylinder

cylinders,

cylinders

allocation

(621,936) (587,384) (552,832)

626,688 591,872

(713,252) (671,296)

62

spare

have

been

list.

cylinders,

rounded

to

the

and

2

DRAFT

1/18/93 09:58

Product Specifications 1-5

Operating Specifications

Table 1·2.

Note:

The

HP C2486A/88A/90A disk drives must be operated within

Requirements specified in Table 1-4 in order for them to function properly.

Interface Controller:

Overhead Buffer size Buffer type Sector size Interleave Logical block size

Seek Times

Track

Head Switch Time

A verage Random

Maximum Seek

Notes:

Seek time

settled over the target track.

overhead time. measured under normal temperature and voltage conditions.

.............................................................

time

...........................................................

.........................................................................

......................................................................

........................................................

.................................................................................

.......................................................

(includes settling time)

to

Track Seek

............................................................

Seek

Reads

Writes

....................................................................

.....................................................................

...............................................................

is

defined

The

HP

C2486A/88A/90A Operating Specifications

the

..........................................................

as

the titne from when the actuator begins to move until the head has

It

does not include any controller overhead time or any initiator

values above are derived from a representative sample of disk drives

Disk Drive Environmental

Industry

Standard

SCSI-2

< 500 microseconds

256

kbytes

Dual-ported

180

- 744

Data

Field Bytes

1:

512, 1024,2048, 4096

2.5 milliseconds

< 1 millisecond

8.75 milliseconds

9.5 milliseconds 18

milliseconds

1

Track

to

track seek time is the mean value of all seek times measured when performing all

possible single track seeks.

A verage random seek time is the time to

possible. Maximum seek time

Spin-up Time

From

Power-On to Ready for Access

Typical:

From

Typical: Maximum:

Disk Rotating Rotational Latency (Average time)

........................................................................

Power-On

.........................................................................

Speed

is

the time

to

SCSI Bus Selection

.......................................................................

...................

1·6 Product Specifications

do

all possible seeks divided

it

takes

to

seek 2531 physical cylinders.

,

.......................................

.....................................

by

the number

4.69 milliseconds ±O.5%

6400

of

seeks

14 seconds

3 seconds 5 seconds

rpm

±0.5%

DRAFT

1/18/93 09:58

Table 1·2.

HP

C2486A/88A/90A Operating Specifications (continued)

Internal Data Transfer Rates (Controller/Disk)

Burst Rates (for single sector transfers):

Inner Zone to

Outer Zone

....................

4.2 to

7.1

Mbytes (34

Sustained Rates: (for continuous transfers; excludes controller overhead)

Inner Zone to

Outer Zone

.................

2.1

to 3.7 Mbytes (17.1

External Data Transfer Rate (Host/Controller)

to

57

Mbits) per second

tq

29.5 Mbits) per second

N arrow

Single-Ended/Differential Asynchronous Synchronous

.......................................................

.................................................

2.5 Mbytes per second

up to 10.0 Mbytes per second

Wide Differential

Asynchronous Synchronous

.......................................................

.................................................

up

5.0 Mbytes per second

to

20.0 Mbytes per second

Recoverable Data Error Rate

Less

than

ten (10) errors in

13

10

bits transferred when the disk drive

is

operated within the

specified environmental limits.

data

Note: A recoverable with the execution of a recovery algorithm. The recovery action is reported Sense

Key

of

1.

(Refer to the Request Sense command in Appendix A.) Mode pages must be in

error occurs when a read or write operation sucessfully completes

to

the host with a

the factory default states.

Unrecoverable Data Error Rate

Less

than

ten (10) errors in

15

10

bits transferred when the disk drive is operated within the

specified environmental limits.

data

Note: An un-recoverable

error occurs when a read or write operation does not sucessfully

complete with the execution of a recovery algorithm. The unsuccessful operation is reported to

Sense

Key

of

3.

the host with a

must be in the factory default states.

pages

(Refer to the Request Sense command in Appendix A.) Mode

Seek Error Rate

Less

than ten (10) seek errors in

environmental limits.

seek

Note: A

error occurs when the drive does not successfully locate the desired cylinder and

head.

Recording Density

Bit Density: Track Density:

Coding System

DRAFT

..........................

......................................

............................................

1/18/93 09:58

107 seeks when the drive

:

...............

2303

108

is

operated within the specified

bits per

mm

(58,500 bits per inch)

tracks per mm (2750 tracks per inch)

1,7 Run Length Limited (RLL) Code

Product Specifications 1·7

Table

Electromagnetic Emissions

1·2.;

HP

C2486A/88A/90A

Operating

Specifications

(continued)

Current Electromagnetic Compatibility the component (standalone) level since EMC is highly dependent upon the characteristics of the system in which the product is installed.

Although regulatory testing is not required, these products have been characterized as individual components using Hewlett-Packard standardized tests.

Acoustical Noise: Typical values measured as average sound pressure

converted to average sound power (in bels) per

Idling:

A-Weighted Sound Power:

Seeking:

A-Weighted Sound Power:

Safety

This product will be evaluated as a component (incomplete in nature) to the following specifications. A complete test and evaluation program should be performed on the end use application.

lEe

.................................................

UL

.......................................................................

CSA EN

............................................................................

TUV DEMKO

Sound Pressure:

......................................................................

Sound Pressure:

......................................................................

...................................................................

................................................

....................................................

.....................................................

(EMC) regulations

ISO 7779.

do

not specify or require testing

at

one meter per ISO 7779;

950,

1st Edition, Amendments 1 and 2

1950, 1st Edition

C22.2

No.

60950,

EN

60950,

1988;

DIN

VDE 0805/05.90

EMKO-TUE (74-SEC) 203/91

37

4.9 bels

39

5.1 bels

950-M89

at

db(A)

1988

Physical Characteristics

Unit Weight Shipping Weight (Single-Unit Package) Shipping Weight (Ten-Unit Package)

Dimensions:

Length Width Height

(Dimensions exclude front bezel. Additional information is provided in Chapter 2.)

..................................................................

........................................

.............................

.................................................................

..................................................................

".:.:

..........

1.1

kg (2.4 Ibs)

1.7 kg (3.7Ibs)

12.5

kg

(27 Ibs)

146.1 mm (5.75 in.)

101.6 rom (4.00 in.)

41.3 rom (1.63 in.)

1·8

Product

Specifications

DRAFT

1/18/93 09:58

DC

Power

Characteristics

All values assume in Table 1-4.

+5 V dc Narrow, Narrow, Narrow, Wide, Wide, Dual

(Idle)

Dual

(Active)Note 3

+12 All

Current Single-Ended Differential (Idle)

Differential (Active)Note 3

Differential (Idle) Differential (Active)Note 3

Port,

Vdc

Narrow,

(ave)

Differential

Current

input

voltages

Table 1·3.

Note

4

are

within

HP

C2486A/88A/90A

Start-Up

Typ/Max Typ/Max

1.08

1.3

A / tbd tbd tbd tbd

tbd

limits specified

A /

1.18

A

1.44

A

A /

tbd

A

A /

tbd

A

A /

tbd

A

A /

tbd

A

A /

tbd

A

DC

under

Input Power Requirements

Power Characteristics

Running

(Note

1)

1.08

A /

1.18

A

1.3

A /

1.44

A

tbd

A /

tbd

A

tbd

A /

tbd

A

tbd

A /

tbd

A

tbd

A /

tbd

A

tbd

A /

tbd

A

0.95

A /

1.05

A

Seeking

Typ/Max

(Note

1.08

A /

1.3

A / tbd tbd

tbd

1.02

A /

A / A /

A /

2)

1.18

1.44

tbd tbd tbd tbd

tbd

1.12

A A A A A A

A

+12

Vdc

All

Power

Narrow, Narrow, Wide,

Differential

Dual

Port,

Notes:

1.

Spindle

2.

Assuming

3.

Differential

4.

Typical

currents

5.

Peak

(peak)

Current

Single-Ended Differential

Narrow,

up

+12

(running

values

Differential

to

speed

random

tranceivers

Vdc

shown

and

operation

transmitting

currents

and

seeking)

are

for

Notes

4, 5

actuator

with

are

for

are

occurrences

3.20

tbd tbd tbd tbd

is

track

a

30%

seek

and

receiving.

sustained

for

initial

greater

A /

3.20

W /

tbd

W /

tbd

W /

tbd

W /

tbd

following.

duty

drive

than

A

W

W W W

cycle.

operation

turn-on

at

5 milliseconds

at

25°

0°

tbd tbd tbd tbd

ambient

C

ambient

duration.

W /

tbd

W /

tbd

W /

tbd

W /

tbd

temperature.

W

tbd

tbd tbd tbd tbd

Maximum

A /

W / W / W / W /

+12

tbd

tbd tbd

tbd

Vdc

A

W W W W

DRAFT 1/18/93

09:58

Product Specifications 1·9

Environmental

R~quirements

The environmental requirements for proper operation of the HP C2486A/88A/90A Disk Drive are listed in Table 1-4.

Table 1-4.

Input Power

Voltages

Regulation

(±10% tolerance allowed for +12V during start-up.)

Ripple and Noise:

+5 V .........................................................................

+12 V

Ambient

Operating Nonoperating

(Maximum rate of change shall not exceed 20°C (36°F) per hour.)

Airflow Requirements

Narrow, Single-Ended Drives Narrow, Differential Drives

Wide, Differential Drives

For more information:

General installation guidelines Narrow, Single-Ended Drives Narrow, Differential Drives Wide, Differential Drives

........................................................................

..............................................................................

........................................................................

Air

Temperature

.......................................................

.................................................

HP

C2486A/88A/90A Environmental Requirements

.......................................................

.........................................................

...........................................................

...........................................

.............................................

..............................................

+5

V,

+12 V

±5%

<

100

mVp-p

<

200

mVp-

5°C

to

50°C (41°F to 122°F)

-40°C to 65°C (-40°F to 149°F)

3 to 5

cfm 3 to 5 cfm 4 to 6 cfm

refer to Chapter 2 refer to Appendix E refer to Appendix F

refer

to

Appendix G

p

Relative Humidity

Operating Nonoperating (storage and shipping)

(Excludes all conditions which can cause condensation in or on the disk drive.)

Altitude

Operating Nonoperating

Tilt

The disk drive will meet all performance specifications on any of the major mounting axes. Refer to Chapter 2 for mounting instructions.

1·10 Product Specifications

.............................................

........................

....................

..................

-

305 m (-

-

305 m (-

8%

to

80%

with wet bulb limit of 28°C

5%

to

90%

with wet bulb limit

1,000 ft) to 3,048 m (10,000 ft) above sea level.

1,000 ft)

to

15,240

IIi

(50,000 ft) above sea level.

of

28°C

DRAFT

1/18/93 09:58

Table

Shock

Operating:

Applied Acceleration The

drive meets recoverable

1-2)

with

default

state.

1·4.

HP

C2486A/88A/90A Environmental Requirements (continued)

(half

no recoverable

sine)

................................

and

unrecoverable

or

unrecoverable hardware faults. Mode pages must

data

error

3.0 g (peak),

rate

specifications (refer

11

milliseconds

to

be

in

factory

Table

Applied Acceleration The

drive meets unrecoverable

(half

sine)

unrecoverable hardware faults. Mode pages

Nonoperating:

(half

Applied Acceleration

The

drive meets recoverable 1-2) with no recoverable Mode pages

must

be

sine)

and

or

unrecoverable

in

factory default

Notes:

A recoverable or

track

hardware

following error, recovery algorithm. to

the

Request Sense

fault

occurs when the drive detects a

and

successfully completes the

The

recovery action is

command

states.

to

the

states.

fault

and

Request Sense

An un-recoverable hardware

or

track

seek execution Sense Key in

the

Swept Sine

factory default

following error,

of

a recovery algorithm.

of

4.

(Refer

Vibration

Operating:

..............................

data

error

rate

specifications (refer

must

be

in factory default

................................

unrecoverable

data

hardware

error

faults

rate and

state.

operation

reported

to

the

in Appendix A.) Mode pages

occurs when

does

not

The

unsuccessful

the

drive

detects a hardware

successfully complete

operation

command

in

Appendix

10.0 g (peak),

to

Table

state.

50 g (peak),

specifications (refer

no

damage

hardware

host

with

must

is

the

reported

error, such

with

the

a Sense Key

be

in

operation

A.) Mode pages

11

milliseconds

1-2)

with

11

milliseconds

to

the

mechanism.

as

execution

of

the

factory default

error, such as a

with

to

the

host with a

no

Table

a seek

of

1.

the

must

a

(Refer

be

Applied Acceleration The

drive meets recoverable 1-2) with no recoverable default

state.

Applied Acceleration The

drive meets unrecoverable

unrecoverable hardware faults. Mode pages

Nonoperating:

Applied Acceleration The

drive meets recoverable 1-2) with no recoverable Mode pages

must

be

DRAFT

1/18/93 09:58

............................................

and

unrecoverable

or

unrecoverable

data

hardware

..............................................

data

error

rate

specifications (refer

must

be

..............................................

and

unrecoverable

or

unrecoverable hardware faults

in factory default

state.

data

0.25 g

error

rate

specifications (refer

faults. Mode pages

0.5 g

to

Table

in

factory

default

2.0 g (peak), 5

error

rate

specifications (refer

and

no

damage

Product Specifications 1·11

(peak), 5 to

must

be

(peak), 5 to

1-2)

state.

to

the

500 Hz

to

Table

in

factory

500

with

no

to

500

to

Table

mechanism.

Hz

Table 1·4.

Electromagnetic Compatibility (EMC)

HP

C2486A/88A/90A Environmental Requirements (continued)

Current EMC regulations do not specify or require testing since EMC is highly dependent upon the characteristics of the system in which installed.

Although regulatory testing is not required, these products have been characterized individual components using Hewlett-Packard standardized tests. These tests are summarized below.

Electromagnetic Susceptibility

Radiated Conducted

+5 V ..............................................

+12 V .............................................

Magnetic

.....................................................

...........................................................

at

the component (standalone) level

the

<

3V

1m

from

14

<

200

m Vp-p from

100

kHz to 250

< 400 mVp-p from 100 kHz

< 4 gauss, 47.5 to

product is

as

kHz

to

250

1 GHz

MHz

198

Hz

1·12 Product Specifications

DRAFT

1/18/93 09:58

Product Installation

Introduction

2

This chapter provides information for drive.

Handling

The purpose of a correct installation is Continually subjecting results in stress on possible combinations of stresses have not been tested applying worst case extremes of several environment parameters are unpredictable.

Protection From Mechanical Shock

Before installation, during shipping

Caution

Guidelines

the

product and can result in early failure or less reliable operation. All

the

disk drive is susceptible to damage from excessive shock

and

handling.

Always handle

and setting

disk drive

the

it

down too

the

mechanical and electrical installation

to

provide

to

the

disk drive carefully

hard

an

extremes

or dropping it.

optimum environment for

of

the

environmental specifications

and

the

to

results

reduce

the

of

simultaneously

danger

of

the

and

losing control

,

Always place Always install a grounded cushioning

storage racks used for handling and storing disk drives.

the

drive top side up on a fiat surface when

pad

on

hard

it

is unmounted.

surfaces such as tables

the

disk

disk drive.

vibration

and

Never stack drives on top of each other.

Protection from Electrostatic Discharge (ESD)

The

electronic components in these products can (hidden) damage by hands

Caution

and

table surfaces.

the

currents generated from

Never handle

surfaces and is first discharged

I

Always

before grounded

DRAFT

1/18/93 09:58

put

it

is handled by a non-grounded person, before moving

(ESD safe) work area, and before

be

permanently destroyed

the

normal

the

drive outside its anti-static bag unless

the

operator

to

the

drive inside

are grounded and

the

surroundings.

the

anti-static

static

the

bag

it

is

electricity

outside of

or

other

to

be stored.

or

. suffer

that

the

surrounding

the

anti-static

approved container

it

Product Installation 2·1

latent

resides on

bag

away from a

Unpacking

the

Disk

Drive

Note

The disk drive is shipped in a reusable shipping container. Retain container and all packing material for re-shipment.

Inspecting the Shipping Container

When your shipment arrives, ensure lading. Inspect

during transit.

be

present when

the

shipping container immediately upon receipt for evidence of mishandling

IT

the

container is damaged or water stained, request

the

container is unpacked.

that

.-.

it

is complete as specified by

the

carrier's bill of

that

the

shipping

carrier's agent

Inspecting the Disk Drive

Remove the disk drive from the shipping container and inspect that

may have occurred during shipment.

Hewlett-Packard and

file

a claim with any carrier involved.

If

any damage is observed, immediately notify

it

for any mechanical damage

Recording the Serial Number

Each drive carries an individual serial number. Keep a record of all serial numbers and dates of purchase. recovery, as well as for any insurance claims.

IT

your drive is lost or stolen, this information is often necessary for tracing and

Disk

Drive

Returns

Return Shipment Addresses

Vendor

Return the drive(s) ordering information for

Hewlett-Packard Direct

Purchases

to

the vendor from which

that

address.

Purchases

it

was purchased. Refer

to

your original

H you purchased your drive(s) directly from Hewlett-Packard, contact your Hewlett-Packard

sales representative for instructions.

..

2-2

Product

Installation

DRAFT

1/18/93 09:58

Re-Packing

For

Shipment

Use the original container and packaging material supplied with

If

the original packaging material is not available, contact your Hewlett-Packard sales

representative for replacements. Figure

the

illustrates

ten-unit packaging.

2-1

illustrates

the

single-unit packaging and Figure 2-2

SEAL ANTI-STATIC AFTER INSERTING

the

drive for any shipments.

BAG

DRIVE.

WSPDH201

DRAFT

1/18/93 09:58

Figure

2-1.

Single-Unit

Length: Width: 8 5 in Height: 6.25 in

10.0 in (254mm) (216mm)

(159mm)

Shipping Weight: 3.5

Packaging

Product

lbs

(1.6kg)

Installation

2-3

SEAL ANTI-STATIC

BAG

PACK EVENLY OUTWARD LESS THAN DRIVES

WHEN

10

..

WSPDM103

FROM

SHIPPING

••

CENTER

.-.A

Dimensions: Length: Width: Height 9.75 in (248mm) Shipping Weight: 25

17.75

136

in

(451mm)

in (346mm)

lbs

(1125kg)

2-4

Product

Installation

~igure

2-2.

Ten-Unit

Packaging

DRAFT

1/18/93 09:58

Mounting

Information

The disk drive can be mounted in any of

Safety /Regulatory

• When installing an HP C2486A/88A/90A Disk Drive into

regulatory Conditions of Acceptability must be considered. Contact your sales/service representative for a-copy of

•

If

the

front bezel option has been installed,

application.

•

If

installing an HP C2486A/88A/90A Disk Drive with an

complete installation should be evaluated in

Chassis

The the only and do not include clearances for power and interface connectors.

Physical

There are twelve (12) threaded mounting holes (for no. 6-32 screws) on each side, and four on the respective appendices for each option.

Dimensions

physical dimensions and mounting screw locations for each interface option are shown in

respective appendices for each option.

Mounting

Compliance

the

Hewlett-Packard Conditions

and

Mounting

bottom

(see Figure 2-3).

the

major

Screw

The

mounting axes.

an

end

of

Acceptability.

it

should be evaluated in

adaptor

the

intended end use application.

Locations

length dimensions shown are for

Use

the mounting guidelines listed in

use

product, safety

the

intended end use

mounting frame,

the

disk

drive: four on

and

the

chassis

the

Airflow

The

drive is maintained within

1.

Airflow

drive should be operated as cool as possible.

option are listed in Table 1-4. function

The

measuring points on

respective appendix for each interface option.

All temperature measurements should be made under worst case operating conditions, These

conditions should be maintained for

before making any measurements.

Requirements

disk drive must be installed

is

required to maintain disk drive performance and reliability. For best results,

of

the

specific airflow

airflow

pattern

around

the

HDA and

so

that

the

ambient air temperature surrounding

the

limits specified under Environmental Requirements in

The

airflow requirements for each interface

The

majority of

pattern

the

drive should be adjusted to prevent

inside

the

PCA

at

least one hour

the

air should

the

cabinet where

from exceeding

to

allow

flow

across

the

maximum limits shown

the

drive

the

disk drive is installed.

the

temperature

to

the

disk

Chapter

the

PCA. This is a

in

the

reach equilibrium

DRAFT

1/18/93 09:58

Product Installation 2·5

Front

The the

Panel

light

emitting

operational

status

normal operation.

LED

Indicator

diode (LED) on

of

the

front of

the

disk drive is

drive from power-on, through

an

activity light

the

self-test diagnostics, and into

that

indicates

LOn

2.

Flashing

3.

Intermittent

Address

The

location

interface option

and

Configuration

and

set-up of

and

its

the

associated

contained in its own appendix

use .

• Table

2-1

lists

the

currently supported interface options, their associated electronics/controller peA

.

peAs,

At

Power-On,

turns

off.

If

the execution and

If

the execution

A flashing portion

After

the

light

and

writing.

address

to

this manual. Save any removed shorting jumpers for future

and

the

LED

turns

Auto-SpinUp

of

testing

Auto-SpinUp

of

LED

of

the

internal

power-on diagnostics will go

If

the

option

the

SpinUp

the

read/write

option

the

SpinUp

(approximately

diagnostic

on

any

LED

is off,

Pin-Set

and

configuration pin-sets depends upon

peA.

the

appendices

The

information for each interface option is

on

until

jumper

sequence,

system.

is

not

sequence only.

1 Hz)

tests.

have

time

the

disk

the

drive is idle.

Set-ups

that

provide configuration details for each

the

Power-On

is

installed,

calibrating

installed,

indicates

completed,

drive

is

sequence

the

Power-On

the

head

the

Power-On

that

the

LED

executing a command,

is

sequence

positioning

sequence

controller

functions

complete

has

the

as

and

includes

electronics,

includes

failed

all

an

activity

reading,

drive

then

or

a

• Table 2-2 lists explanation of each.

Table

Interface

001 SCSI-2,

002

012 SCSI-2,

2-6

Product

Installation

the

currently supported configuration options

2-1.

Option

AddressiConfiguration

Fast,

SCSI-2,

Fast,

Pin-Set

Interface

Narrow, Single-Ended

Narrow, Differential

Wide,

Differential

Information

peA

and

provides a brief

Locations

Appendix

E

F

G

DRAFT

1/18/93 09:58

Table

2·2.

Address/Configuration

Option

Descriptions

Configuration

Auto

Spin

Up

Parity

SCSI-l/SCSI-2

SCSI Address Selection Narrow SCSI drives

Synchronized

Option

Spindle.

When

shorted,

not

will spin

up SENSE, INQUIRY, RESERVE, RELEASE, access.

When

shorted, drive does shorted.

When

open, default is SCSI-2.

pin-sets which sets factory

These

pinsets

if

the

Synchronous Spindle Mode is disabled.

the

Stand power-on Select

command

these

functions, including positional offset from

•

When

It It

•

When

It It

•

When

It It

the

spin

up

until

mode

the

not

check for parity.

the

drive checks Mode

with

shorting

control

Alone, Slave,

default

for all drives is

page

the

drive is

does

not

the

not drive is not

sync

drive is

transmit a sync sync

transmit a sync

to

does

will

transmits

syncs internally

Description

disk drive will automatically

the

Initiator

drive will

disk drive checks

When

shorted

are

shipped

up

a SCSI Address

jumpers the

routing

and

04 infomation

in

the

to

allY

set

to

an

externally sourced slave

set

to

a sync signal

to

return

Parity

the

from

across

Master

the

Stand

signal.

externally

the

SIa1le

signal.

the

Ma8ter

on

the

same signal.

sends a Start

"Not

Ready"

parity

on

bits

are

Page

09,

drive is forced

the

factory

of

7.

all

four pin-sets which

of

the

Synchronized Spindle signals.

modes,

Stand

Alone Mode. Refer

in

Appendix A for more details

Alone

mode:

sourced slave sync

mode:

the

sync

spin

up

Unit

command.

to

all

and

START

commands

generated

byte

8,

bit 4 and

to

with

Wide

SCSI

The

C2486A/88A/90A

but

not

the

input

sync

signal.

pin.

at

power on. H

When

commands

UNIT

and

whether

respond shorting

drives

Master

except

until

data.

this

responds accordingly.

as

a SCSI-! device.

jumpers

are

shipped

sets

up

Control

to

the

sync

signal.

inputs.

open,

the

not

in

the

REQUEST

the

drive

is

ready

When

open,

pin-set

across

a SCSI Address

They

disk drives

mode.

Mode

about

the

is

open

all

from

the

have

no

support

The

Sense/Mode

implementing

drive auto

disk

or

The

three

of

effect

for

15.

Synchronous Request

Termination Unit Write

(SDTR)

Attention

Protect

Data

Transfer

Power Source

When open, host-initiated

Determines Controls When

the is

NOT

A for more details.

DRAFT

1/18/93 09:58

shorted,

the

shorted,

Write

drive will

the

Unit

Protect

write

protected.

the

SDTR

power

Attention

the

function

drive will

not

initiate

message

source

entire

drive is forced

Refer

initiate

an

whether

and

function:

can

be

to

an

SDTR

SPTR

this

routing

Shorted

into

controlled

the

Mode

message

message.

pin-set

is

for

the

on-board

= disabled;

the

media

with

the

Select/Mode

at

power-on

The

drive

open

or

terminators. Open = enabled.

Write

Mode

Sense

Product

and

willl'espond

shorted.

Protect

Select

command.

explanation

RESET.

to

a

mode.

When

The

in

Appendix

Installation

When

open,

default

2·7

Drive

You should be aware bus.

To

Interface

Connections

,

of

the following considerations when connecting

the

drive

to

the

SCSI

• Static

• Resistive/Capacitive Loading • "Glitch" Generation

Caution

I

The effects of connecting a drive

• Drive powered

1. Connecting or removing a powered-off drive

2.

3.

Damage

1. A void static damage handling and grounding procedures.

When plugging

ground

When unplugging SCSI connector before disconnecting

2.

The active terminators must have terminator power (TermPwr) applied all times; either from

off:

Connecting or removing a powered-off drive the

bus

is

loaded and terminated according

The

SCSI bus will operate properly with one or more drives connected

• Stub Length • Terminator

to

all components of a bus system by observing proper

a drive into an active or inactive bus, connect

to

the

system ground before connecting

a drive from an active or inactive bus, disconnect

the

SCSI bus pin 26, or from

to

the

SCSI bus are as follows:

to

the

power connector.

to/from

an inactive bus will have no effect. an active bus will have no effect

the ANSI specification.

Power

the

SCSI connector.

the

drive, or both.

but

the

drive's

the

at

if

powered-off.

4. Applying power is loaded and terminated according to

• Drive powered on:

1. Connecting

2.

Connecting or removing a powered-on drive

the

bus is loaded and terminated according

3. Removing power from a powered-on drive connected

bus is loaded and terminated according

to

a powered-off drive connected to

or

removing a powered-on drive

the

ANSI specification .

to/from to/from

to

the

bus will have no effect if

an inactive bus will have no effect. an active bus will have no effect

the

ANSI specification.

to

the bus will have no effect

ANSI specification.

the

if

bus

if

the

2-8 Product Installation

DRAFT

1/18/93 09:56

Interface Connectors and Cables

Connector Dimensions and Locations

The

physical locations

appendices for each interface

SCSI Connector

The

SCSI device connector is a nonshielded 50-pin (narrow drives)

connector.

The

physical construction and pin assignments for SCSI specifications. Mating connector information is listed assignments

are

listed in

DC Power Connector

and

dimensions

PCA.

the

respective appendices for each interface

of

Refer

the

interface connectors

to

Table

2-1

for a list

of

the

in

Table 2-3.

are

shown in

the

respective

these appendices.

or

a 68-pin (wide drives)

connectors conform

The

connector pin

PCA

(refer

to

Table 2-1).

to

Power requirements for the disk drive are listed in

the

power connector are shown in

respective appendices for each interface

Chapter

2-1). Mating connector information is listed in Table 2-3.

Mating Connector Requirements

Table 2-3. Recommended Mating Connectors

Connector

SCSI

Connector

single-ended

SCSI

Connector

DC

Power

Synchronized

Shorting

Notes:

1.

2.

jumpers

Contact (For

AWG 20-24 wire,

Contact (For

AWG 26-30 wire,

/Function

(narrow:

and

differential)

(wide: differential)

Spindle

insert

inserts

Connector

(2.0

mm

required;

spacing)

refer

use

AMP®

refer

use

Dupont®

to

3M®

AMP@

AMP®

vendor

Equivalents

3425-6600

786090-7

1-480424-0

Housing

2x1

shorting

2x2

connector

2x3

connector

2x5 COlmector

documentation

1-87309-4.)

documentation

77138-101;

Recommended

may

4-87456-9 I

jumper:

for

Dupont@ housing: housing: housing:

to

select

to

select

AWG 32-36 wire,

be

used.

Dupont® Dupont® Dupont®

the

1.

Mating

86730-001

69307-004 2

69307-006 2 69307-010 2

proper

contact

proper

use

Dupont®

assignments for

Connector

(HP

1258-0209)

set

for

contact

set

for

77139-101.)

PCA

the

(refer

installed

the

dc

to

wire

wire size.

Table

size.

DRAFT

1/18/93 09:58

Product

Installation 2-9

Cabling

The

Requirements

disk drive adheres to

specifications. Refer

to

the

cabling requirements and limitations

the

SCSI specifications for additional details.

set

forth in

the

ANSI SCSI

• Cables with a characteristic impedance of 100 ohms flat

or

twisted

• Cables with a characteristic impedance of

pair

ribbon cable.

90

ohms ±10% are preferred for shielded cables.

±1O%

are recommended for unshielded

• To minimize discontinuities and signal reflections, do not use cables with different

the

impedances on

• A minimum wire size of

distribution of termination power. Note: because connector designs,

same bus.

28

AWG should be used

a wire size

to

minimize noise effects and ensure proper

of

physical size limitations of current

of

30 AWG should be used for wide differential cabling.

• Cables must be properly terminated.

Single-ended Cable

• A 50-conductor flat cable or 25-signal twisted-pair cable should be used. Cable length

should be equal

to

or

less

than

6.0 meters. This refers

to

internal and external cable length

(except stubs).

• A

stub

length of no more

than

0.1

meter is allowed off

the

main line interconnection within

any connected device.

Differential Cable

• For narrow differential drives, a 50-conductor flat cable

should be used. For wide differential drives, pair cable should be used. Twisted should be equal to or less

than

pair

25

meters. This refers to internal and external cable length

a 68-conductor flat cable

cabling

is

or

preferred

25-signal twisted-pair cable

or

34-signal twisted

to

minimize noise. Cable length

(except stubs).

• A

stub

length

of

no more

any connected device.

2-10 Product Installation

than

0.2 meter is allowed off

the

main line interconnection within

1/18/93 09:58

DRAFT

Product Features

Introduction

This chapter provides an overall functional description, major assembly descriptions, and a

block diagram description.

3

Functional

This section provides a functional description of

Disk

Format

The head/disk assembly (RDA) contains the magnetic disks (see Figure 3-1). Table the

physical allocation of the cylinders. Each physical sector can store 512 bytes of user

in

the

standard format. The user can choose sizes (from which are

Description

the

RP

C2486A/88A/90A SCSI disk drives.

3-1

to

format the drives using other physical sector

180-744 bytes in increments of 2 bytes). The user can choose logical block sizes

1,

2,

4, or 8 times as large as the physical sector size.

lists

data

Sector Format

The smallest directly addressable storage area on a is

accomplished when the controller specifies the address of

The formatted sector bytes are allocated as shown in figure 3-2.

Addressing

All

addressing between the disk drive and the host is logical. converts the logical block address into the appropriate physical address (Le. cylinder, head, sector), allowing for any sparing operations blocks larger physical sectors into the currently specified logical block size.

Structure

that

than

the physical sector size, the drive automatically blocks and deblocks the

data

surface is a sector. Accessing a sector

the

cylinder, head, and sector.

.

The

drive's embedded controller

have been performed. To support logical

'

Error

The disk drives use a Reed-Solomon error correction code (ECC) for detection and correction of information, and writes

read operation, the controller generates an 18-byte code from

compares from

The ECC function is enabled or disabled via the DCR (Disable Correction)

page 01R of the MODE SELECT command. When enabled,

DRAFT

1/18/93

Correction

data

errors. During a write operation,

it

to

the

ECC field, a

09:58

Code

the

ECC field created during the write operation.

data

the

ECC function generates

information into the ECC field as

error is detected and the ECC field is used

the

sector is written. During a

the

data

If

the

ECC algorithm divides a

18

bytes of

field being read, and

I8-byte code differs

to

correct

Product

bit

ECC

the

data.

in

parameter

Features

3·1

sector's two, 72 contiguous bytes is 65. Therefore, boundaries of nine contiguous bytes, contiguous bytes, been executed (Le. read

The Span field Span field value is bytes-per-interleave by dividing it

Cyclic Redundancy Check (CRC)

ECC miscorrection. assumed,

data

field

into

three interleaves, or rows, with a selectable correction factor of one,

or

three

bytes per'interleave. Mathematically, this converts to a maximum

bits

per

number

up

to

sector. However,

it

will be flagged as unrecoverable after

of

bytes

in

parameter

stated

the

nearest

byte

.

that

the

maximum number of bits

if

an error

it

will be corrected.

retry

count, recalibrations, read with offset, reseek, etc.).

will

be

corrected in an interleave is selectable via

page 01h

of

in bits-per-sector.

it

by 24 (8-bits per byte times

the

'.

MODE

The

value.

is aided by a 2-byte cyclic redundancy check (CRC)

With

the

correction span set

the

calculated probabilities of error misdetection

to

burst

SELECT

ECC

72

bits,

that

is guaranteed

longer

than

65

bits falls exactly within

If

it

spreads across more

the

error correction algorithm has

command.

The

Correction

algorithm converts this value

three

interleaves)

to

decrease

if a random

and

miscorrection are as follows:

the

probability

error distribution is

burst

to

fit

the

Correction

and

size

into

nine

than

to

rounding

of

the

nine

error

• Probability

1 x

10-

• Probability than

less

79

of

misdetection (an error exists,

.

of

miscorrection

47

1 x

10-

.

(an

error

is

detected,

but

Track Sparing

Refer

ta

Table

3-1

far a complete track allocation list. eight "pools", one located given zone have been used, the drive will use to

the

outer

diameter.

Track sparing is implemented for any defect within

may

operation During a

and

the

logical volume is slipped one

defective

exist in

Format

track

is passed over

operation, "Slip Track Sparing" is used: defective tracks are passed over,

For a Reassign Block operation, is reassigned in

a RAM look-up encounters to

the

original

to

an

alternate track located in

table

the

defective track,

track

the

and

to

continue

at

the

inside diameter of each zone.

the

header,

and

data

field,

track

the

read continues

or

into

the

"Skip Track Sparing" is used:

the

supplied

it

to

will seek

the

read.

the

servo system prior

to

the

spare cylinders

any

spare pool.

alternate

ECC does

but

The

the

other

not

recognize

it)

is less

is improperly corrected) with

spare cylinders are divided

If

all of

the

spare cylinders in a

in

the

adjacent zones

track. Defects causing a spare

area

within

the

physical sector.

than

spare pool. During subsequent reads,

at

the

next logical track.

the

data

in

the

defective

The

"new" location is maintained

to

seeking. When.

location, read

the

data,

the

and

drive

CRC

into

nearer

the

track

return

is

Look Ahead Reads

The

Look Ahead Read capability can improve READs by preloading the READ command. After a READ command is received by

proper to track on

3·2 Product Features

the

track

host,

into

same

and

loads

the

Look Ahead Read function continues

the

buffer.

track,

If

in subsequent READ requests,

they will already be in

track

buffer with

requested

data

the

into

the

performance

data

most

the

buffer. While

to

buffer,

and

likely the

controller,

read

the

host asks for

the

data

of

a drive doing sequential

to

be requested with

the

drive seeks

that

data

is being transferred

remainder of

the

will be

the

current

following blocks

returned

1/18/93 09:58

to

the

DRAFT

the

host without the delay of a media access. However, the controller is optimized

requested

If a

data

to

the host as fast as possible.

new

READ command requests

data

not contained in the buffer while

performing a Look Ahead Read, the process is aborted, and the drive will immediately seek

the new track with no effect

unrequested

data

has a lower priority

on

access or transfer performance. Filling the track buffer with

than

delivering requested

data,

Other conditions

the

to

return any

drive is

to

that may affect completing a full-track READ before receiving the next READ command are: head position relative to the requested data, transfer size, and the host

tr~nsfer

rate.

Head

The drive executes periodic head alignments During the

Alignments

Power-On sequence,

to

maintain proper track following tolerances.

the

drive executes a complete calibration and head alignment

for all heads. For subsequent operation, there are two modes for head alignments: the

automatic mode, and

Initiator-controlled mode. In the automatic (default) mode,

the

the drive automatically implements single head alignments in Seek, Read, and Write commands. In the Initiator-controlled mode, head alignments are executed upon receipt

of

a Rezero Unit

command.

Head Alignment States

The drive will enter either a head alignment needed or critical

temperature since the last head alignment, or the elapsed time since

Temperature

H a

temperature

defined

thresholds,

needed

state.

the

needed

state. H the second (higher) accomplished,

change

the

H a

head

threshold

the

drive

Considerations

exceeds

drive

enters

alignment

temperature

before a

enters

the

first

of

the

head

occurs

the

change exceeds

head

alignment

critical

two

factory alignment drive cancels

state.

is

the

Under

normal alignment drive

enters alignment the

expected

drive

enters head

alignments

reliable

operation

calibrations

occurs

state

Elapsed

conditions,

the

needed

the

time

interval

the

critical

are

under

according

the

Time

Considerations

the

drive

at

preset

state

at

drive

cancels passes

state.

pre-defined

start-up

to

changes in

last head alignment.

schedules intervals these

the

without a calibration,

The

time

at

the

and

after

intervals.

needed

periods

factory

long

term

head

spin-up.

H a

head

state.

between

to

assure

conditions.

H twice

The

the

Head Alignment Modes

The Mode Select command (page 09H, byte 8, bits 6 and 7), allows

head alignment function as follows:

DRAFT 1/18/93

09:58

the

Initiator

to

control

Product Features 3·3

the

Drive

State

Automatic

(bit

6 =

Mode

0)

Initiator

Controlled

(bit

6 =

Mode

1)

Norm4/

,

Needed:

CritiC4i:

Perlonn RezeroUnit

Embed Write

Rezero

Write Read,

Rezero

no

automatic

behavior:

bit 7 =0: command bit

7 = 1: align: all

Command

single-head alignments

commands.

Unit

bit

7 = 0: align command bit

7 = 1: align all command

Protect or

Write

Unit

bit

7 = 0: align command bit

7 = 1: align all command

align

current

behavior:

current

until

alignment

command.

behavior:

current

head

heads

Typical Head Alignment Times

alignments.

head

on

in

Seek,

head

on

head

on

Read,

on

Rezero

Unit

and

Rezero

Unit

Rezero

Unit

Disable Rezero

Unit

Disable alignments

Rezero

Unit

Disable to a head alignment occurs

Rezero

Unit

automatic

Unit

behavior:

bit

7 = 0: align

command bit

7 =

1:

Command

automatic

upon

Unit

behavior:

bit

7 = 0: command bit

7 = 1: align all

command

automatic

that

Unit

behavior:

bit

7 = 0: command bit

7 = 1: align command

head

alignments.

current

head

on

align

all

heads

on

alignments.

receipt

of

Rezero

align

current

head

on

heads

on

needs alignment. Write

align

alignments except for a

on

current

head

all

heads

on

Rezero

Execute

commands.

Rezero

Protect

Rezero

Unit

write

until

Unit

The time requirements for head alignments will vary according

to

how they are executed.

Some typical values are listed below:

Single

Head

Alignment:

All-Heads Alignment:

13

data

heads

....................

................•.....

110 milliseconds

;.:

..

820 milliseconds

Command Queuing

The

disk drives support the following SCSI command queuing operations:

• Head

• Simple Queue Tag. Instructs the Target

• Ordered Queue Tag. Instructs the Target

of

Queue Tag. Instructs the Target

the

command queue and execute

it executed. A command in the process of being executed will not be executes multiple Head-of-Queue commands

to

put

the command

that

follows

at

the front of

immediately following the command currently being

to

in

last-in, first-out order.

put

the command

pre~empted.

that

follows

The Target

at

the end of command queue. The Target executes multiple Simple-Queue commands in any order will enable

it

to

minimize actuator seek times

to

block locations if

the

queue algorithm

modifier allows it.

to

put

the command

the

command queue. The Target executes Ordered-Queue commands in the order they were

received. All Simple-Queue commands received prior

to

an

that

follows

Ordered~Queue

at

the

command are

the

that

end of

3·4 Product Features DRAFT

1/18/93 09:58

executed before an Ordered-Queue command are executed after

the

Ordered-Queue command. All Simple-Queue commands received after

the

Ordered-Queue command.

• Clear Queue Message. Clears from queue for terminated. All pending is sent for any of initiators with The additional sense code for

• Abort Tag Message. the execution is halted. Any pending or ending message is sent active or queued

Command queuing is activated by a one-byte queue one-byte queue are:

20H = Head of Queue Tag

21H 22H

A queue

to

tags

is assigned

to

a LUN, all commands are aborted for

the

specified logical unit (LUN). All active

the

I/O

processes

device goes

current

I/O

tag

to

the

Bus Free phase following successful receipt

Instructs

process.

I/O

processes are not affected.

tag

message

value

that

= Simple Queue Tag = Ordered Queue Tag

tag

value can be any hex value from

a LUN. A queue

to

is completed.

tag

status

the

If

and

processes. A Unit Attention condition is generated for all other

that

Unit Attention is: Commands Cleared by Another Initiator.

the

target

to

the

initiator. Pending

the

that

specifies

uniquely defines

value becomes available for reassignment after

If

more

the

queue all

data

for

either were active or were queued for

target

status

than

to

has already

or

Target when

the

one command with

that

I/O

that

LUN are cleared.

abort

a tagged command.

started

data

for

the

type

the

I/O

OOh

to

initiator.

processes from all initiators

I/O

processes for

No

.of

this message.

execution

the

I/O

process is cleared

status,

of command queuing, followed by a

FFh.

data,

Initiator

process.

An

Initiator

the

of

and commands for

precedes a command with

The

queue

same queue

in

the

that

LUN are

status

that

The

the

can assign 256 queue

or message

target.

target

I/O

tag

the

tag

clears

process,

and

no

message values

I/O

process

value is sent

The

the

status

other

it

The

Clear Queue and Abort Tag operations are activated by one-byte messages with no

follow-on values. These message formats are:

OEH

= Clear Queue

ODH = Abort

If

an Initiator sends a tagged command

Target will send a Queue Full

and

time,

Untagged commands are also accepted by

• An untagged command sent by an commands (tagged or untagged) in

• A tagged command sent by an command already in

The drives will clear

then

Note

Tag

to

a Target when

status

send

the

command again.

the

queue

the

queue in either case.

Error

recovery is an exception

to

required while a Target is executing a command.

send

to

the

Initiator. The

the

drives with

Initiator

the

Initiator

that

was sent by

an

untagged REQUEST SENSE command if

will not be accepted

queue

that

will not

to

were sent by

be the

the

command queue is full,

Initiator

the

accepted

same Initiator.

above restrictions because

should wait a period of

following restrictions:

if

there are any

the

same

Initiator.

if

there is

an

untagged

"

the

other

the

Initiator

an

error occurs

is

DRAFT

1/18/93 09:58

Product Features 3·5

Error Recovery

If

an error occurs while a Target is executing a queued command, the following error recovery

sequence is performed

1.

Target sends a Check Condition

2.

A Contingent Allegiance condition is established for the current Initiator. This means all

commands in

Initiator (normally a

Initiators will be queued normally.

3.

If

QErr=l Sense commands), all commands in clearwhich clears Additional Sense Key all other Initiators

in the Control Mode Parameter Page

to

ensure proper handling of any commands still in the queue:

status

the

queue are suspended until the next command is received from

REQUEST SENSE command). Commands received from other

the

Contingent Allegiance condition. A Unit Attention condition with

of

Tagged Commands Cleared by Another Initiator is established for

that

had

commands in the-queue.

to

the current Initiator.

OAh

(refer

to

the

Mode Select and Mode

the

queue are aborted upon receipt of a command

the

current

to

an

Current Initiator sends

4. REQUEST SENSE, it is'executed immediately by the Target. command other command is queued or rejected according to normal queuing procedures.

5.

The

Contingent Allegiance condition is removed, and any commands still in the queue are

executed by

Synchronized

Synchronized spindle operation (Master or Slave modes) is enabled via Mode Page 04R. Refer to

Table

A), for more details about implementing these functions.

2-2

Assembly

The

assemblies in electronics/controller printed-circuit assembly mechanical and electromechanical assemblies of the disk drive. The drive electronics/controller

PCA

provides the SCSI interface and all electronic control over the RDA. The following

paragraphs describe

than

the

Target in a normal manner.

Spindle

(Chapter 2), and the Mode Sense/Mode Select command information (Appendix

Descriptions

the

next command.

an untagged REQUEST SENSE, error recovery is terminated and the

If

the next command is an untagged

lithe

next command is any

Operation

disk drive include the head/disk assembly (RDA) and the drive

(PCA). The sealed RDA contains

the

major functional components of each assembly.

the

Head/Disk

The head/disk assembly (RDA) contains disks, heads, circuits, atmospheric controls, vibration isolators, and a spindle assembly. A stainless steel baseplate and cover provide sealed and is not field repairable.

Disks

The disks are 3.5-inch (95 mm) diameter aluminum substrates with sputtered thin-film surfaces. information.

3·6 Product Features DRAFT

Assembly

Data

is stored on

an

actuator

the

supporting structure for these parts. The entire assembly is

both

surfaces of all disks except for one surface reserved for servo

assembly, head interface

1/18/93 08:58

Heads

Thin film

each unit is used

Actuator

A rotary actuator positions the heads. A shipping latch captures the inside diameter of the disks (away from user data) whenever power is removed from drive. This prevents the heads from moving over are spinning, causing power-up sequence, the processor releases

Head

The head interface circuits (located inside the RDA), process between the read/write heads and the drive electronics/controller write drivers which provide the necessary current read preamplifiers circuit on the drive electronics/controller

data

and

Latch

Interface

heads in the RDA write and read user data. An additional thin film head in

to

recover the servo information.

Assembly

the

Electronics

that

amplify

heads to

data

fly

at

a safe distance above

the

latch, allowing normal movement of

read from

peA.

the

Additional functions performed by

actuator

data

until power is applied

the

disk surfaces. During

the

data

signals transferred

peA.

to

the heads during write operations, and

These circuits include

disk before transferring

it

arm

and

to

at

the

disks

the

read/write

the

disk

the

heads.

head

interface include head selection and write control.

Atmospheric

Controls

The atmospheric controls in the RDA consist of a breather filter and a recirculating filter. The breather filter equalizes air pressure within the RDA to ambient air pressure

and prevents contaminants from entering the RDA. The recirculating filter maintains the internal cleanliness of

the

RDA.

Vibration

The RDA is mounted on vibration isolators

Isolators

to

protect

it

from high frequency external

vibrations.

Spindle

Assembly

The spindle assembly provides the mechanical mounting for the disks. The spindle rotates on a bearing system and is driven by an "in motor is supplied by the spindle driver circuit on the drive electronics/controller

hub" brushless

dc

motor.

The

drive current for the

peA.

DRAFT

1/18/93 09:58

Product

Features 3·7

Block Diagram

Refer

to

figure 3-3.

including head positioning,

SCSI Interface

The

SCSI interface is electronics. configuration information.

The

SCSI interface handles SCSI protocol without intervention from and is capable of automatically controlling each transaction. Full arbitration and disconnectJreselection are implemented by interface.

It

RAM Buffer

The

RAM buffer contains 256-kilobytes of

the

and

disk must pass through

Disk Controller

The

disk controller coordinates SCSI interface and of

data

between

the

accesses and

the

256-kilobyte

disk controller.

The

drive electronics/controller

data

transfer, spindle speed, and power distribution.

the

direct electrical interface between

handles all SCSI timing and protocol, and

the

static

the

RAM buffer.

the

flow

of

data

the

disk controller.

the

SCSI interface,

static

RAM buffer

It

contains a DMA section which controls

the

buffer RAM

to

PCA

proper sequence of bus phases involved in

RAM. All

by interleaving RAM accesses between

and

match

the

controls

the

transfer

data

the

transfer speeds of

the

operation

SCSI channel

of commands,

the

microprocessor,

transferred between

disk controller.

and

The

the

of

the

drive,

the

drive

status

SCSI interface

the

SCSI

the

transfer

DMA

and

host

the

The

disk controller also performs error checking on RAM buffer and generates ECC on data

controller also does header verification during

data

transferred from

data

being transferred from

the

RAM buffer

read/write

operations.

to

the

Data Encoder/Decoder

The

primary Return

1,7)

data information provided by normal Read and Write operations.

function of

to

Zero)

transferred

the

datal

clock present on

to

and from

the

Data

Encoder/Decoder is

the

SCSI channel and RLL (Run Length Limited,

the

disk surface. This includes sector length

host during format operations as well as

to

convert between

the

NRZ (Non

and

data

transfers during

Microcontroller

The

microcontroller used on

micro controller is responsible for decoding incoming SCSI commands, controlling

processor

and

the

read/write

the

drive electronics/controller

circuitry, and managing

PCA

is a single-chip device.

the

head alignment function.

the

disk.

the

disk

to

The

content

The

servo

the

3·8

Product

Features

1/18/93

DRAFT

09:58

Servo Processor

The

servo processor provides index and start-of-sector timing signals,

movement,

motor

spin-up and speed control, and synchronized spindle operation. movement control consists of track-to-track seeks, track following, DC

and

repeatable AC errors. Motor spin-up

drive

motor

current modified by information derived from Synchronized spindle control is derived from an external sync position information from

the

disk surface.

and

speed control consists of regulated

the

dedicated servo surface.

input

Data Head Interface

The

data and the

head interface processes

the

data

encoder / decoder. This includes head selection, providing analog write

heads,

and

amplification and conversion of impulses from

the

data

signals transferred between

the

Actuator Driver

The

actuator driver amplifies

resultant current

driver provides

the

control information provided by

to

the

actuator.

current necessary

to

operate

the

servo processor, and

Servo Timing

and

correction for

that

the

heads

to

actuator

controls

actuator

Actuator

is compared

read/write

RLL

data.

assembly.

outputs

both

to

heads

current

The the

to

The head

function

into

of

the

position

servo timing circuit is

and

Spindle Motor Driver

The

spindle

in-hub spindle

motor

motor.

driver provides 3-phase current

Power Distribution

The

+5

and +

12

voltages provided by an external dc power supply are spindle alerts in a predefined

motor

the

driver,

other

actuator

circuits when power-on occurs

manner

rotation

to

the

to

amplify and convert impulses from

speed information for

to

the

servo processor.

start,

drive,

and

control

the

speed

distributed

driver, analog amplifiers, and digital circuitry. A reset

and

when power is lost. Each circuit responds

reset condition.

servo

to

output

the

of

the

DRAFT

1/18/93

09:58

Product Features 3·9

3addrs

ACTUATOR

[

'-'

0

,...,

16

L..J

1

,....,

15

2 1

'-'

,...,

14

3 2

'-'

,...,

13

4

'-'

"""SERVO

5

'-'

,...,

12 10

L-J

6

,...,

11

7 6

'-'

10

'-'

8

,..,

9

0

13

12

11 3

·SERVO

4

5 9

8 6 7

0

10

1 9 2

SERVO

3 8

4 7

5

"490'

C248M C2486A

r-

}

HEAD

GIVEN LOGICAL FORMA T

y i i

"'"

LANDING CYLINDER CYLINDER

ZONE

Figure 3·1. Disk Drive Addressing Structure

NUMBERS

IN

2530

0

3-10 Product Features

DRAFT

1/18/93 09:58

Table 3·1. C2486A/88A/90A Cylinder Allocation

Function Zone 0 (Outer

Defect List

Logs,

Mode

Pages

Maintenance

User

Data

Spares

Zone

1

Zone)

Product

C2486A/88A/90A

C2486A/88A/90A C2486A

C2488A

C2490A 0 4

C2486A

C2488A

C2490A

C2486A C2488A C2490A 480

CYlinder(s)

0 0

0 1 o

0 1

1

2

thru

479 o

1 4

2

thru

479 o

1 2

thru

479 o

480

thru

493(14

480

thru

493 (14

thru

493 (14

1

ea) ea) ea)

Head(s)2

0,1,2

3 4

thru thru

4

thru

o

thru3 thru

o

thru thru

4

thru thru

4

thru

o

thru

o

thru

o

thru

10 3

13

16 3

10 10

13 13

16 16

10 13 16

User

Spares

Zone

User

Spares

Zone

User

Spares

Notes:

1.

Cylinder

2.

Head

Data

2

Data

3

Data

references

are

given

C2486A 494 C2488A 494 C2490A 494

C2486A 665 C2488A 665 C2490A 665

C2486A C2488A C2490A

C2486A 811 C2488A 811 C2490A

C2486A C2488A C2490A

given

in

physical

logical

format.

thru thru thru

67a

thtu

670

thru

670

thru

806

thru

806

thru

806

thru

thru thru

811

thru

961

thru

961

thru

96lthru

664 o 664 o 664 o

669 (5

ea)

669 (5

ea)

669 (5

ea)

805 o 805 805 o

810 (5

ea)

810

(5

ea)

810

(5

ea)

960 960 960

964 (4

ea)

964 (4

ea)

964 (4

ea)

(continued

o o o

o

o o o

thru thru thru

on

10 13 16

DRAFT

1/18/93 09:58

Product Features 3·11

'Table 3·1. C2486A/88A/90A Cylinder Allocation (continued)

Zone

User

Spares

Zone

User

Spares

Zone

User

Spares

4

Data

5

Data

6

Data

Function

C2486A

C2488A C2490A

C2486A C2488A C2490A

Product

Cylinder(s)l

965

thru

965

thru

965

thru

1105 1105 1105

1109 1109 1109

1287 1287 1287

1291 1291

1291

1435 1435 1435

1104 1104 1104

thru

1108

(4 thru thru

thru thru thru

ea)

1108

(4

ea)

1108

(4

ea)

1286 1286 1286

1290

(4

ea)

1290

(4

ea)

1290

(4

ea)

1434 1434 o

1434

1439 (5 1439 (5 1439 (5

ea) ea) ea)

Head(s)2

o

thru

o

thru

o

thru

o

thru

o

thru

o

thru

o

thru

o

thru

o

thru

o

thru

o

thru

o

thru

o

thru thru

o

thru

o

thru

o

thru

o

thru

10 13 16

10 13

16

10 13 16

Zone

User

Spares

Zone

User

Spares

Notes:

1.

Cylinder

2.

Head

7

--

Data

8

Data

references

are

given

in

C2486A C2488A C2490A

in

physical

logical

fonnat.

1440 1440 1440

1592 1592 1592

1595 1595 1595

1743 1743 1743

thru

1591

thru

1591

thru

1591

thru

1594

(3

thru

1594 (3-ea)

thru

1594

thru

1742 o

thru thru

thru thru thru

ea)

(3

ea)

1742 o 1742

1747

(5

ea)

1747 (5

ea)

1747

(5ea)

(continued

o

thru

o

thru

o

thru

o

thru

o

thru

o

thru

thru thru

o

thru

o

thru

o

thru

o

thru,16

on

10 13 16

10 13

3·12

Product Features

DRAFT

1/18/93 09:58

Table 3·1. C2486A/88A/90A Cylinder Allocation (continued)

Zone

User

Spares

Zone

User

Spares

Zone

User

Spares

9

Data

10

Data

11

Data

Function

Product

C2486A C2488A C2490A

C2486A C2488A C2490A 1894

C2486A C2488A C2490A

C2486A 2032 C2488A C2490A 2032

C2486A C2488A C2490A

C2486A 2200 C2488A 2200 C2490A

1748 1748 1748

1894 1894

1896 1896 1896

2032

2036 2036 2036

2200

CYlinder(s)

thru thru thru'1893

thru thru thru

1

1893 1893

1895

(2 (2

(4

(3

ea) ea) ea)

ea) ea)

ea)

1895

1895 (2

2031 2031 o 2031

2035 (4 2035 2035 (4

2199 o 2199 2199 o

2202 2202 (3 2202 (3

Head(s)2

o

thru

o

thru

o

thru

o

thru

o

thru

o

thru

o

thru thru

o

thru

o

thru

o

thru

o

thru

o

thru thru

o

thru

o

thru

o

thru

10 13 16

10 13

16

10 13

16

Zone

User

Spares

Zone

User

Spares

Notes:

1.

Cylinder

2.

Head

12

Data

13

(Inner

Data

references

Zone)

references

are

given

C2486A C2488A C2490A

C2486A C2488A C2490A 2347

C2486A 2349 C2488A C2490A

C2486A 2529 C2488A 2529 C2490A

given

in

physical

logical

fonnat.

2203 2203 2203

2347 2347

2349 2349

2529

thru

2346

thru

2346

thru

2346 o

thru

2348 (2

thru

2348 (2

thru

2348 (2

thru

2528 o

thru

2528 o

thru

2528 o

thru

2530 (2

thru

2530 (2

thru

2530 (2

ea) ea) ea)

o

thru

o

thru

o

thru

o

thru

o

thru

thru thru thru

o

thru

o

thru

0·dlJ'lll6

10

13

16

10

13

16

10

13

16

10

13

DRAFT 1/18/93

09:58

Product Features 3·13

INDEX/SECTOR

) Write

1 4

"Zpdm303

Splice

Bytes

ipost

i Gap

i

14

NOTES:

1.

2.

---~----------.---------.-

Sector

4

Bytes

Data

PLO

Sync

Byles

(00)

FOUR

BYTE BYTE BYTE n3: PHYSICAL TRACK ADDRESS LSB BYTE n4:

~CLUDES

Write

Splice

4

Bytes

Data Sync

Pattern

1

Byte

(BE)

BYTE HEADER ADDRESS FORMAT

n1:

FLAG BYTE

n2: PHYSICAL

LOGICAL

SPEED TOLERANCE BYTES.

Header

PLO

23

bytes

(00)

Dala Field

512

Bytes

TRACK

SECTOR

Sync

Data

18

(NUMBERS

ADDRESS

Header

Sync

Pattern

1

Byte

(BE)

ECC

Bytes

IN

PA TTERN

..

Header

Address'

4

Bytes

Note 1

Data

CRC

2

Bytes

PARENTHESIS REPRESENT

WRITTEN

MSB

Header

2

Data

Pad

6

Byte

(0)

CRC

Bytes

ON

Intersector

7

DISK)

Header

Pad

8

Bytes

(00)

Gap

Bytes

Note 2

)

(

Figure

3·2.

Formatted

Physical

Sector

Allocation

3·14

Product

Features

DRAFT

1/18/93 09:58

<:

SCSI

CHANNEL

SCSI

INTERFACE

~;

RAM

BUFFER

~;

DISK

CONTROLLER

"

A

...

.A

"

A

ELECTRONICS/

CONTROLLER

DISK

PCA

DATA

-~

"

ENCODER!

"

DATA

DECODER

w2Ddm304

SECTOR

PROCESSOR

i r

SERVO

INDEX

...

DATA

HEAD

POSITION

ACTUATOR

MOTOR

CONTROL

SERVO

INFORMA

HEAD

POSITION

SPEED

TION

SPINDLE

MOTOR

CONTROL

Figure 3·3.

..

MICRO-

CONTROLLER

...

HEAD

ALIGNMENT

ACTUATOR

DRIVER

SERVO TIMING

SPINDLE

MOTOR

DRIVER

Disk

Drive Block Diagram

/'"'II

r----

i

I I

I

I I

I

----------------

DATA

HEAD

INTERFACE

1

r----o

f----D

~

f----D

~

"-

f----D

v

~

----

,-

f----DSERVO

~

f----D

r--t::J

~

r--t::J

~

'--

I HALL EFFECT

SENSOR

J

MOTOR

i

DATA

HEADS

r---

=:Jf

FEEDBACK

CURRENT

HDA

DRAFT

1/18/93 09:58

Product Features 3·15

SCSI Interface

Introduction

4

This chapter describes the implementation the

HP C2486A/88A/90A Disk Drives. The information includes an overview of features, options, and commands supported by these products. Any operating characteristics relevant the HP C2486A/88A/90A Disk Drives.

Table which commands are

implementations. Appendix A provides detailed descriptions of the

These descriptions are in alphabetical order and include Command Descriptor Block

formats, further command specific details, refer

Appendix B provides descriptions of the Vendor These descriptions include Command Descriptor Block

device specific information involved in command execution.

Supported

The Target supports

to

SCSI implementation are also discussed. In this manual

1-1

provides a list of all the commands supported by

SCSI implementations and which commands are Vendor Unique

data

formats, and all device specific information involved

Functions

the

following:

of

the Small Computer System Interface, SCSI on

the

Target and identifies

SCSI commands supported by

to

the ANSI SCSI Specification.

Unique commands supported by

(CDB) formats,

the

SCSI

the

term Target refers

the

Target.

(CDB)

in

command execution. For

the

Target.

data

formats, and all

to

• Command Queuing. Command queuing is supported.

• Write Cache. Write caching is supported.

• Arbitration. Full arbitration is supported.

• Disconnect. significant delay occurring during a

• Linked Commands. Command linking is supported.

DRAFT

1/18/93 09:58

If

allowed, the Target may disconnect after a command is received, and for any

data

transfer operation.

SCSI

Interface 4·1

• Power-On Sequence Sequence. At Power-on, Turn on LED

Microprocessor Microprocessor RAM Test Data

Controller Test

ECC

Verification Test

Buffer RAM Test, first 64 bytes

and

Test Initialize SCSI interface

If

Auto Spin-Up is not enabled: turn

If

Auto begin spin-up sequence:

Initialize Servo Processor .

off LED

Spin-Up is enabled:

Start Test buffer RAM while spindle is gaining speed Settle heads on track and calibrate servo system Perform head alignments Write/Read Initialize Initialize Logs Initialize Turn off LED and wait for a command

Self Test

and

wait for a command

spindle motor (See Note below)

Test

Spare Table

Saved Pages Information

the

Target performs

the

following:

the

Note: While (except subsequent

•

Data

Head Alignment. These drives incorporate

data

head alignments. A full head alignment is executed

alignments may be executed relative

power-on.

• Bus Reset. In response to a SCSI bus reset or Bus Device Reset message,

perform

Turn on LED Abort Initialize Initialize Controller Initialize

Initialize Logs

Initialize Turn

REQUEST SENSE and INQUIRY) with a

the

following:

Any Command

SCSI interface

Spare Table

Saved Pages Information

off LED

spindle

REQUEST

and

wait for a command

motor

SENSE command will

is spinning up,

the

to

temperature

the

drive will respond

return

capability

changes

- '

in

Progress (reads/writes are aborted

status

byte

of Check Condition.

a Sense Key Code of Not Ready.

to

perform periodic

at

power-on. ,Subsequent head

and/or

elapsed time since

at

sector boundaries)

to

all commands

the

Target will

The

4·2

SCSI

Interface

DRAFT

1/18/93 09:58

• SCSI Messages.

The

following SCSI messages are supported:

Code (hex)

00 1 01

01 03

00 02 04 1 05 1 06 07 08

09 OA OB OC OD OE

20 2

21

22 2

80-FF

Notes:

1.

In = Target

2.

2nd

byte

Length (bytes)

to

Initiator;

indicates

22

The 3* 2*

1

1 1

1 1 1

2

1

additional

Conunand Extended

following

Request Wide *

added

Abort Save Disconuect Initiator Abort Message No Message Linked Linked Bus Abort Clear Simple Head Ordered Identify

Out = Initiator

Complete

Message

extended

for

Data

length

Tag

Data

Pointers

Detected

Reject

Operation

Parity Command Command

Device

Tag

Queue

of

Queue

length

of

Transfer

SDTR

in

error

Reset

Tag

to

extended

Message

to

Follow

message

Request

bytes

Error

Complete Complete

Target.

message

is

supported:

With

.

Flag

Direction!

In

In/Out

In/Out In/Out

Out

In In

Out

In/Out

Out

In In

Out

In/Out

Out Out

In/Out

•

Status

Codes.

The

following

status

Code (hex)

byte

codes are supported:

Status

Good

00

Check Condition

02

Busy

08

Intermediate

10

Reservation Conflict

18

Queue Full

28

DRAFT 1/18/93 09:58

SCSI

Interface 4·3

Table

4·1.

HP

C2486A/88A/90A

Supported

SCSI

Commands

Command

Access Log

Change

Definition 40

Change

SCSI

Change

Wide

Execute

Fonnat Inquiry Interface Manage Media Mode Mode Mode

Mode

Read Read Read Read Read Read Read Read Reassign Receive Reformat Release Request Reserve Rezero

Data

Unit

Primary

Test Select Select Sense Sense

(6-byte) (lO-byte) Buffer Capacity Defect

Full

Headers Long

Diagnostic

Sense

Unit

ill

SCSI

Control

(6-byte)

(lO-byte) (6-byte) (lO-byte)

Data

Blocks

Track

Name

ill

Results

Opcode

(hex)

(Appendix

F2

Cl C2

FE

04 12

EF

FD

Fl

15

55 lA 5A

08

28 •

3C

25

37

FO

EE

3E

07

IC

ED

17 03 16 01

SCSI

Command

*

* *

*

•

*

* *

*

* *

•

'.

*

* *

A)

Vendor

Command

(Appendix

Unique

B)

*

* *

*

* *

*

4·4

SCSI

Interface

DRAFT

1/18/93 09:58

Table 4·1.

HP

C2486A/88A/90A Supported SCSI Commands (continued)

Command

Name

Opcode

(hex)

Seek (6-byte) Seek (lO-byte) 2B Send

Diagnostic Start/Stop Synchronize Cache 35 Test Verify Write Write Write Write Write Full Write Long Write

Unit

Ready

(6-byte) (to-byte)

and

Verify 2E

Buffer 3B

Same

.

·~lB

OB

10

00

2F OA 2A

FC

3F

41

SCSI

Command

(Appendix

* * * *

*

* * * * * *

*

A)

Vendor

Command

(Appendix

*

Unique

B)

DRAFT SCSI Interface 1/18/93 09:58

4·5

Status Byte

A

status termination of each command as specified, unless the command is cleared by an message, by a format, code values, and code descriptions are shown below.

byte is sent from the Target to the Initiator during the Status phase

Bus

Device Reset message, or by a "hard"

Reset

condition. The

at

the

Abort

status

byte

Byte

00

Value

3

S 4

0

0 0 1 0 0

0 1 0 0

0

2 1

0 0 0

0 0 1

7

Reserved

Good

Check

Busy

0

Intennediate

6

I

Status

Condition

Status

S

Byte Format

Bit

4

I

Status

I

Byte

3

Code

Status Byte Code Descriptions

Description

Indicates

Caused to

Check Condition

The accept a command to

This

(except condition retum.ed, the

by

be

set.

Target

issue

the

status

the

series will

that

Target

any

The

is

busy.

conunand

is

retum.ed

last causes the

chain

be

has

error,

exception,

REQUEST

status

This

from

again

for

GOOD

a Check

of

linked

requested.

successfully

or

SENSE

to

determine

status

is

an

Initiator.

at a later

every

conunand),

conunand

Condition

conunands

abnonnal conunand

retum.ed

2

I

completed

the

nature

whenever a Target

The

nonnallnitiator

time.

in

unless

an

status

to

is

broken;

I

the

condition

should

be

of

the

a series error,

exception,

be

set.

no

1 0

conunand.

that

causes

issued

condition.

recovery

of

linked

IT

this

status

further

Reserved

sense

following a

is

unable

action

commands

or

abnonnal

is

not

commands

data

to

is

in

0 1 1 0

0

1

1 0 0

4·6

SCSI Interface

Reservation

0

Queue

Conflict

Full

This unit

This

Head

I/O

status

that

is

status

oj

Queue

process

is

retum.ed

reserved

is

retum.ed

Tag

is

not

whenever a SCSI

to

another

when

message

placed

in

is

the

device

and

the

queue.

attempts

command

SCSI

device.

a Simple Queue Tag, Ordered

received

conunand

to

access

a logical

Queue

Tag,

or

queue

is full.

The

DRAFT

1/18/93 09:58

SCSI Message Support

The

disk drive supports messages received from

the

Initiator

in

the

following manner:

• Multiple

byte

message

out

phases are allowed.

• Any message out may be prefixed with an optional Identify byte.

• An optional number by

the

disk drive prior

• Only one message type be accepted per message treated

as an illegal message.

• A maximum of 16-message out bytes will be accepted by still set after type, except

The

following message types are supported:

Message Parity

Initiator Detected

Abort

Reset

No-Op

Message Reject

16

that

Error

of

No-Op message bytes

to

the

final message byte.

(other

out

than

phase.

the

If

more

may

be embedded in

Identify prefix and

than

one type is received,

the

bytes have been received, the disk drive will

the

disk drive will always

If

either of these messages

Error

will abort the command in process

Command

valid has

Condition

This message will cause the disk drive to process, clear the Initiator's status and go

This message will cause the disk drive process, reset to

Bus Free state.

This message will be treated by

some legal message byte, except when the No-Op message type received immediately following a Re-select this case, the Target will re-select phase.

If

a Message Reject message

normally be treated like an Illegal Message.

Message In phase and attempting

will

with the sense code set to Initiator Detected Error.

LUN

has been received in an Identify or CDB, and a

not

yet begun, then the command will be terminated with a Check

status; otherwise the Target will go to the Bus Free state.

it

be treated differently.

terminate

Power On conditions for all Initiators, and go to the

in a Bus Free

is

received from the Initiator, the disk drive

as

an illegal message type if

attempt

is

received from

the

optional N o-Op bytes) will

disk drive.

treat

and

set the sense key to Aborted

to

proceed with the interrupted

to

send one of the following messages

the

message

the

if

out

received

message will

the

ATN line is

this as an illegal message

state.

If

a

status

abort

the command in

to

the Bus Free state.

abort the command in

not

attempt

Only if the Target

by the Target. In

the

Initiator

it

phase

followed

will

is

in the

be

is

DRAFT

1/18/93 09:58

Disconnect Message will not disconnect and will proceed with the command in process. This

will

not

prevent the disk drive from

from the Initiator Synchronous

an asynchronous transfer is expected. This will affect all later transfer phases.

Data

In, Save

at

a later time.

Transfer Message In.

Data

Pointer

The

Message.ln~

attempting

Target will assume

The

to

disconnect

SCSI

Interface 4·7

Target

data

that

Extended SDTR Message

Target Error Conditions

The SDTR (SynChronous Data Transfer Request) message type will only be accepted prior to the

Command phase, and only prior

to

the

first

Command phase in a linked command set. At any other time

it

will be treated as an illegal message type. If the negotiation process

is

started

by

the Initiator, the drive will respond with its SDTR message.

If

the Initiate SDTR Message Option

is

enabled, the drive will initiate

an

SDTR message

a.t

Power On and Reset.

Under some error conditions

the

Target may proceed

to

the

Bus Free phase without

terminating

the

command (i.e. no Disconnect

or

Command Complete message sent

to

the

host). In this case,

the

Target will not

attempt

to re-connect with

the

Initiator.

The

Initiator

should consider this as a catastrophic error. Information regarding

the

cause

of

this abnormal

response can be recovered by

the

Initiator with

the

REQUEST SENSE command.

Message Out Phase Parity Error

If

parity checking is enabled and a message out parity error is detected

the

disk drive will

abort

the

command

in

process and set

the

sense key

to

Aborted Command with

the

sense

code set

to

Parity Error. If a valid

LUN

has been received in an identify or in

the

CDB, and

status

phase has not yet begun, then

the

command will be terminated with a Check Condition

status; otherwise,

the

Target will go the

the

Bus Free

state.

Command

or

Data Out Phase Parity Error

If

parity checking is enabled and a Command or

Data

Out

phase parity error

is

detected then

disk drive will

terminate

the

command in process with a Check Condition status.

The

sense

information will have the sense key set

to

Aborted Command with

the

sense code set

to

Parity

Error.

Illegal Messages

If

an illegal or unexpected message out is received from

the

Initiator,

the

disk drive will

abort

the

command in process and set

the

sense key

to

Aborted Command with

the

sense code set to

Inappropriate/megal Message.

If

a valid LUN has been received

in

an identify or in

the

CDB,

and

the

status

phase has not yet begun, then

the

command will be terminated with a Check

Condition status; otherwise

the

Target will go

to

the

BUS

FREE

phase.

Reselection Timeout

If

the

Target

attempts

to reselect

the

Initiator

and

the

Initiator does not respond within a

Selection Timeout Delay,

the

Target will

attempt

to

reselect a second time.

If

the

second

attempt

fails,

the

Target will

abort

the command

in

process

and

make no further

attempts

to

reselect

the

host.

The

sense information will be set with a sense key of Hardware Error and a

sense code

of

Select/Reselect Failed.

4·8

SCSI

Interface

DRAFT

1/18/93 09:58

SCSI Command Descriptions

A

This appendix provides descriptions of A-I is a list for each command.

Command

Detailed descriptions of following pages. These descriptions include Command Descriptor Block (CDB) formats,

formats, and all device-specific information involved

ofthe

SCSI commands supported by

Descriptions

the

SCSI commands supported by

the

SCSI commands supported by

the

Target with brief descriptions included

the

Target are provided in

in

command execution.

the

Target. Table

the

Command Details

The

following information applies

•

The

abbreviations "MSB" and "LSB" in

and

most significant byte

•

The

Target only supports a single Logical Unit Number (LUN). All commands

addressed

•

All reserved fields in each command must be set to

• All reserved and vendor-unique fields in each command are tested for proper values (normally

to

LUN 0, except an INQUIRY command which

0).

least significant byte, respectively.

to

all commands:

the

CDB

and

O.

other

descriptor blocks refer

may

be directed

must

to

any LUN.

to

data

the

be

DRAFT

1/18/93 09:58

SCSI

Command

Descriptions A·1

Control Byte

The

control byte is the

last

byte of every Command Descriptor Block (CDB).

Byte

Last

Link. Command linking

7

Vend

I

Unq

6

= 0

is

desires an automatic link to

Control

5

supported. A Link bit set

the

next command upon successful completion of

I

Byte

Bit

4

Reserved

Format

3

I

to

one (1) indicates

2 1 0

I

Flag

that

the command. After successful completion of the current command, the Target will status

Flag. Typically, the FLAG bit is used

of INTERMEDIATE and will then send one of

to

cause an interrupt in

the

messages defined by

the

Initiator between linked

commands.

When LINK::: 0 (zero), then FLAG will = 0 (zero).

When LINK

= 1 (one), and FLAG = 0 (zero), the Target will return a LINKED

COMMAND COMPLETE message when the command completes successfully, When LINK

COMMAND COMPLETE (WITH FLAG) message when

= 1 (one), and FLAG = 1 (one), the Target will return a LINKED

the

command completes

successfully,

Note

For the Mode Select command only, bit 7 of the control byte (1) or disable parameter list header reports

(0) the Write Protect mode. The

the

Write Protect status:

WP

bit in the Mode Sense

is

the

Initiator

current

return

the

FLAG bit.

used

to

Link

a

enable

1

= enabled

o = disabled.

A-2

SCSI

Command

Descriptions

DRAFT

1/18/93 09:58

Table

A-1.

Supported

SCSI-2

Commands

Command

Change

Definition

Format

Unit

Inquiry

Mode Select

(6-byte) 15

(to-byte)

Opcode

(hex)

40 No No

04

12

55

Use

Before

Spinup

No No

Yes

No 2

Use

When

Wpl

Enabled

Yes

Description

Requests definition.

Formats

Defect sources include P, formatting, list (FMTDAT=O). However, list, The Interleave field.

Requests Initiator. Data. requested

Provides a drive

•

• Block Length: multiples

•

Use

• Disable Correction

•

• Recovery Limit (converts

the

Target

Supported

Target

media

it

is recommended

it

must

be

Target

Additional

parameters

Media Density Code: 0 Number

Page

of

the

Data Post

Transfer Block Retry

in

uses

an

that

information regarding

Target

by

the

means

Type:

0

of

Blocks:

Codes (hex):

following is

Termination

Error

(PER)

Count

to

change

definitions

into

Initiator

0,

the

physical

interleave

returns

36

Vital

Product

Initiator.

for

Initiator

to

Target.

used

to of

01,02,03,04,08,09,

supported:

(OCR)

on

Error

(TB)

to

the

specified

are

SCSI (CCS)

addressable logic blocks.

and

G lists

(no C list).

that

the

Initiator

if

the

Initiator

sector

or

of

bytes

to

The

set

1, 2, 4, 8,

(DTE)

to

Retry

bytes

1 regardless

Target

of

SCSI

Data

specify media, logical

following values

capacity

Standard

(VPD)

of

and

Count)

operating

does

from

of

the

be

sent

may

drive

16

of

OA

and

SCSI-2.

When

not

include a 0

index

value

to

the

Product

be

supplied

unit,

are

supported:

blocking

format. in

if

or

factor

Mode Sense

(6-byte)

(IO-byte)

Read

(6-byte) 08 10-byte (extended)

(to-byte)

Read

Buffer

Notes:

1.

WP

= Write

2. Mode Select

Protect

and

Mode

lA 5A

28

3C

Sense commands

DRAFT

1/18/93 09:58

No 2

No

Yes

that

Yes'

Yes

Provides a drive supported:

•

Page vaIues)j

•

Page

The parameters description.

.

Requests

Used buffer. Recommend executing data

do

not

involve saved pages

means

parameters

Control

10

(default values);

Codes (hex):

Target

default block size is 512

are

listed

Target

with

WRITE

integrity.

for

Target

to

Initiator.

Field:

to

transfer command

BUFFER

to

The

00

(current

01,02,03, 04,08,09,

in

the

MODE

data

formats

command

may

be

used

SCSI

Command

report

its

following

values);

11

(saved values)

bytes.

SENSE

to

Initiator.

are

RESERVE

before

media,

logical

COB

values

01

(changeable

OA

Default

supported.

to

test

command

spinup.

page

command

Both

6-byte

the

Target's

Descriptions

unit,

are

to

guarantee

or

and

data

A-3

Table

A-1.Supported

SCSI-2

Commands

(continued)

Command

Read

Capacity

Read

Defect 37

Data

Read

Long

Reassign Blocks

Receive

Diagnostic Diagnostic

Results Release 17

Request

Sense 03

Reserve

Opcode

(hex)

25 No Yes

3E

07 No No

lC

16

'Use

Before

Spinup

No

Yes Yes

Yes

Yes Yes

'Use

When

Wpl

Enabled

Enables logical supported

Yes

Yes Requests

Yes

Requests Target index

of Requests

logical defect list

Requests

Releases previously reserved logical Release

Only Pointer

Unit Reservations

one

Initiator

unit.

Target

returns

format.

Target

physical sector.

Target

unit

supported.

the

and

to

Use

of

(REL=O) .

to

P,

G,

to

reserved for

contain

the

target

command

Extended

Field

Third-Party

are

not

Description

request

information regarding

PMI

bit

supported.

..

transfer

return

reassign defective logical blocks

only one defect

Extent

Sense

Pointer

media

or

P+G

the

this

purpose.

to

send

the

to

the

initiator.

Release

Data

fields

Reservations

supported.

lists

header,

Format

Relative Addressing

defect

data

in

physical

data

It

is recommended

location

results

of

a previous

units.

Unit

not

supported. is

supported,

are

not

used.

are

supported.

"

to

sector

field

per

command.

capacity

Initiator.

or

and

ECC

to

Send

and

Third-Party

Extent

bytes

an

The

bytes

area

that

Bit

of

not

from

on

the

Rezero

Seek

(6-byte)

(lO-byte)

Send

Diagnostic

Start/Stop

Synchronize

Cache

Test

Ready

Verify

Notes:

1.

WP = Write

2.

Mode

Unit

Select

Protect

and

Mode

01

OB

2B

to

IB

35

00

2F

Sense

commands

No Yes

No

No Yes

Yes Yes

No No

Yes Yes

No No

Yes

that

Requests logical

address

Requests

lO-byte (extended)

status

when seek is complete.

Self-test (Power-On) self-test·fails, CHECK are

available via

Both

modes

Ensures

their

Checks

status

Requests

performing a selectable

addressing

do

not

that

most

Target

if

involve saved pages

Target

to

perform

O.

Target

to

seek

to

formats

and

CONDITION

REQUEST

are

supported.

specified logical blocks

recent

data

value recorded

spindle

for

drive is

up

to

speed.

Target

to

verify

ECC

not

supported.

may

a recalibrate

a specified address.

are

supported.

Translate

SENSE

proper

the

data

check

(REL=O).

be

used

Address

status

command.

in

the

on

speed.

Target

written"on

or a byte

before

and

the

spinup.

then

Both

Target

are

supported.

indicates

cache

memory

media.

returns

the

compare.

to

seek

6-byte

returns

that

media

Relative

to

and

GOOD

IT

results

have

GOOD

by

A-4

SCSI

Command

Descriptions

DRAFT

1/18/93 09:58

Table

A·1.

Supported

SCSI·2

Commands

(continued)

Command

Write

(6-byte)

(lO-byte)

Write

And

Verify

Write

Buffer

Write

Notes:

1.

WP = Write

2.

Mode

Long

Same

Select

Opcode

Protect

and

Mode

(hex)

OA 2A

2E

3B

3F

41

Sense

Use

Before

Spinup

No No

No

No No Allows

No

commands

Use

When

Wpl

Enabled

No

that

do

Requests the supported.

The byte

May avoid

RESERVE

command.

header,

Requests

media

not

media.

Target

compare.

be

possible

involve

Target

Both

perfonns a write

Relative

used

to

data

command

Initiator

data,

and

the

Target

a specified

saved

pages

to

write

6-byte

test

Target's

corruption,

be

to

write

ECC

to

number

may

Description

the

data

and

lO-byte

followed

addressing

data

it

executed

one

complete

fields.

write

the

of

times.

be

used

transferred

(extended)

by

an

not

supported.

buffer

or

is

recommended

prior

to

physical

supplied

before

spinup.

by

formats

ECC

download

the

WRITE

sector,

block

of

the

Intitiator

verify

(REL=O).

code.

that

a BUFFER

including

data

are

pass

to

To

the

or

to

a

DRAFT

1/18/93 09:58

SCSI

Command

Descriptions

A·5

Change

Definition

The

CHANGE DEFINITION command requests

the

Target

to

change

to

the

operating

definition specified in the Definition Parameter field for

all further interaction with subsequent

Initiators.

Change

Definition

Command

Description

Block

(COB)

Bit

Byte

7

I

6

I

5

I

4

I

3

I

2

I

1

I

0

00

Opcode

= 40H

01

Logical Unit

Nwnber

I

Reserved

02

Reserved

I

Save

03

Reserved I

Definition

Parameter

04-07

Reserved

08

Parameter

List

Length

= 0

09

Control

Byte

Save. This

bit

is ignored by

the

Target.

The

Target will save

the

new operating definition

regardless of

the

state

of

the

Save bit.

No

error will be declared based on the

state

of this

bit.

Definition

Parameter.

This field indicates

the

new operating definition the Target

is

to

use

after

the

command is implemented. Any value other

than

those listed below will result in a

status

of Check Condition and a sense key of Illegal Request.

Field

Value

(hex)

00 01

02

03

Operating

Definition

The

CWTent

Operating

Definition is

not

changed SCSI X3.131-1986 1 SCSI (CCS) 1 SCSI-2 X3.131-19xx

1.

The

implementation

of

SCSI X3.131-1986

and

SCSI (CCS) is identical

in

these

products.

Parameter

List Length. Any value other

than

0 (zero) will be rejected with a

Status

of

CHECK CONDITION and a Sense Key

oflLLEGAL

REQUEST.

A·6

SCSI

Command

Descriptions

DRAFT

1/18/93 09:58

Format Unit

Format

The blocks according command, controlled by instructions (if any) are contained in phase of

The can be accessed. Any lost. Any log information will be cleared by operating zero

Unit

FORMAT UNIT command formats

to

the

command.

FORMAT

parameters

(0).

Initiator

Target may perform a media defect management algorithm (which can be

Initiator

UNIT command ensures

data

will become

defined options. During execution

using optional forms

the

residing on

the

saved values

the

Target media

of

the

Defect List supplied

that

the

media is

into

Initiator-addressable logical

of

the

FORMAT

command). Defect management

to

the

formatted

Target

so

that

in

all

media before this command is issued will

the

format operation.

if

the

DSP

bit

The

current Mode Select

in

the

defect

There are four possible sources of defect location information during execution FORMAT UNIT command:

Plist

(Primary manufacturer. Plist is accessible by

the

by Plist

Initiator

is

not

Clist (Target Certification List). This list includes defects detected optional certification process executed during added

to

subject

the

Glist.

Defect List).

The

Plist is stored outside of

the

except through

to

change.

The

Target

list

(to

the

The

of

permanent

the

defects supplied by

Initiator-accessible logical block space. reference while formatting), READ

DEFECT

command. Once created,

Format Unit command does

the

FORMAT UNIT command.

but

not

is

not

affect

by

the

original

normally accessible

the

Target during an

UNIT

the

data

list

of

the

Plist.

This

Data

Out

blocks

be

header is

The

original

list will

be

Dlist

(Data

Defect List). Supplied by

the

Initiator

in

the

Data

Out

phase

of

the

UNIT command. Glist (Grown Defect List.) Maintained by the Target and includes all defects sent

Target from current command.

Byte

00

01

02

03-04

05

FMTDTA information (Dlist)

there the

Target will all previous defect information (Glist) and

the

FORMAT

The

(Format

will be no

the

CMPLST

Initiator

UNIT

Glist does

7

Logical Unit

Data

not

(the

operations,

NOT

Format Unit Command Descriptor Block (COB)

6

I

Number

Data). to

Indicates whether

the

Target.

Out

receive a new Dlist,

bit

and

Dlist), any defects identified by

and

any defects identified by a REASSIGN BLOCKS

include

I

(MSB=03)

If

5

set

the

to

Plist.

Bit

4

I

Opcode - 04H

I

FMTDTA I CMPLST

Vendor Unique

Interleave

Control

the

I

Byte

Initiator will send additional defect

zero (0),

phase,

is

retained,

the

Defect List

Format

field will have no effect.

the

3

1

(LSB=04)

Target during previous

I

2

Defect List

1

Format

FORMAT

to

the

and

0

I

DRAFT

1/18/93 09:58

SCSI Command Descriptions A-7

Format Unit

If

set to one (1), a new Dlist will be supplied by the Initiator and the CMPLST bit

Defect List Format field will provide additional parameters.

and

the

CMPLST (Complete List). Determines whether or not existing defects

If

set

to

retained during the format. to

it.

If

set to

1,

the defects in the Dlist are used

zero (0), the Glist is retained and

to

create a new Glist which replaces

Glist. Defed

List Format. The supported field values are:

Field

Value

o 0 0 Block

o 0 1 Reserved

format

Description

(defect list

length

of

zero)

o 1 0 Reserved

o 1 1 Reserved

FMTDTA

1

0

1 0

1 1 1

Notes:

1.

The

preferred

2.

The

Format

3. Defect list

CMPLST

option

Unit

length

X

is

FMTDTA command of

zero only.

0 0

1 1 0 1 Physical sector 1 1 1 1 1 Reserved

Defect

Format

XXX

101

or

100

or

000

01

or

100

or

000

=

always leaves

Bytes

from index

0 Reserved

format

(recommended)

FORMAT UNIT Defect Sources

List

Field

3

O.

the

Defect

Supplied

Plist

List

No

Yes

unaltered.

• No

Data

• No Dlist

•

Retain New Dlist supplied

•

Retain

•

Append

New Dlist

•

Build

• Replace

new Glist from

Target

Out

Phase.

supplied

current

new Dlist

supplied

old

Glist

by

Glist

with

.

in

the Glist will be

the

Dlist is appended

Instructions

Initiator.

2

•

by

Initiator.

2

•

to

current

Glist.

by

Initiator.

supplied

Dlist.

new Glist.

the

old

Vendor Unique Byte. This byte must contain all zeros.

Interleave. These bytes specify

Any interleave value will be accepted, value of (1) so

A-8 SCSI Command Descriptions DRAFT

that

logical blocks are placed in consecutive physical order.

the

order in which logical blocks are related

but

the

Target will ·always use

to

physical blocks.

its

default interleave

1/18/93 09:58

Format Unit

Defect List

The defect list consists of a 4-byte header followed by zero or more 8-byte defect descriptors.

Each descriptor consists of an 8-byte physical address or bytes from index address. Each

is

address

bounds-checked by the Target.

REQUEST Sense Key

is

generated, and the format operation is discontinued.

If

any address

is

out of bounds, an ILLEGAL

FORMAT

Byte

00 01 FOV

02-03

7

6

I

DPRY

I

(MSB=02) Defect List Length

FOV (Format Options Valid). (Disable Primary), DCRT (Disable Certification),

UNIT Defect List Header Format .

Bit

1)

I

DCRT

I

If

the FOV bit is set to one (1), the drive will accept a DPRY

I I

4

Reserved

STPF

3

I

IP=O

I

(Stop Format)

2

I

DSP

I

(LSB=03)

1

I I IMED=O I

and/or

DSP (Disable

I

0

VU=o

Saving Parameter) bites) set to one (1). All other options must be set to zero (0). DPRY (Disable Primary). A DPRY

the

of

media identified

as

defective in Target cannot locate the Plist or action specified by the

Plist

to

identify defective areas of

nCRT

(Disable Certification). A DCRT

STPF

bit. A DPRY bit of one (1) indicates

the

a media certification operation to generate a

bit

of zero (0) indicates

the

Plist for Initiator addressable logic blocks.

it

cannot determine

the

media. The Plist is not deleted.

bit

of zero (0) indicates

Clist. A DCRT

that

if

a Plist exists,

bit

Target will

it

that

the

not

use portions

will perform the

the

target will not use

Target will perform

of one (1), indicates

If

the

that

the

target will not perform any media certification process or format verification operation while

the

executing

STPF

(Stop Format). The

FORMAT UNIT command.

STPF

bit

controls

the

behavior of

the

Target when one

of

the

following events occurs:

1.

The Target has requested the use of is

set

to

zero) and the Target cannot locate

2.

The target has been requested (CMPLST is set

A

STPF

bit

of zero (0) indicates

to

zero), and

that, Target will continue to execute the CHECK CONDITION status

at

the Key will be set to RECOVERED ERROR and DEFECT ERROR

A

STPF

will terminate

LIST NOT FOUND if condition 1 described above occurs, or

if

condition 2 occurs.

bit

of

one (1) indicates

the

FORMAT UNIT command with a status of CHECK CONDITION, a

that,

the

Plist (DPRY

the

to

use

the

Plist (DPRY

the

Target encounters an error while accessing

if one or

both

is

set

list or determine whether

is

set

of the above conditions occurs, the

FORMAT UNIT command. The Target will

completion of

if one or

the

FORMAT UNIT command.

the

Additional Sense Code will be set

both

of the above conditions occurs,

Sense Key of MEDIA ERROR, and an Additional Sense Code

FOUND IP

Initialization it

formats

DRAFT

1/18/93 09:58

if condition 1 occurred,

(Initialization

Pattern).

Pattern

the

media.

or

DEFECT

The IP bit must be set

LIST ERROR

to

zero (0), indicating

will be sent. The Target will use its default initialization

to

zero), or the Glist (CMPLST

the

list exists.

to

zero)

or

the

Glist

the

Dlist.

return

The

DEFECT

LIST

the

of

either

if

condition 2 occurred.

DEFECT

that

no

LIST NOT

pattern

SCSI

Command Descriptions A-9

Sense

to

either

Target

when

Format Unit

DSP (Disable Saving

the

MODE

SELECT

VU {Vendor Unique}. This

Parameter). parameters.

bit

must

A DSP

Defect List Length. This field specifies

follows. A sector number of

Byte

00-02

03

04-07

7

1

(MSB=04)

Each defect descriptor specifies cylinder number of

from index

to COMDITION if of

the

address is

the

defect, or the the

the

defect descriptors are not in ascending order. cylinder number.

number of bytes from index

format chosen. More

than

FFFFFFFFH

Defect Descriptor Format

6

(MSB=OO) Cylinder

Defect

defect,

the

to

1>

I

Bytes

the

location of a defect. Each descriptor is comprised of

the

head number of

defective sector number.

the

defect, or

one block may be affected by each defect descriptor.

be set

the

Head

From

The

bit

of one (1) specifies

to

zero (0).

total

length in bytes of

indicates

I

Number

Index

Bit

4,

Or

that

I

Of Defect

Of

Defect

Defective

the

defect,

least significant

the

defective sector number, depending on

that

the

Target will

the

defect descriptor

the

entire

3

Sector

The

part

track

will

be

I

Number

and

2

(LSB=02)

either

1

I

(LSB=07)

the

number of bytes

Target will reeturn CHECK

The

most significant

of

the

address is either

not

save

that

reallocated.

0

J

the

part

the

A defect bytes from index of defective sector number of

entire

track

will

be

reallocated.

FFFFFFFF(h)

indicates

that

the

A-10 SCSI Command Descriptions

DRAFT

1/18/93 09:58

Inquiry

The INQUIRY command requests to

the Initiator.

The INQUIRY command will return a CHECK cannot return the requested Inquiry data. Inquiry peripheral device may not be ready for other commands. The execute even

If

an INQUIRY command is received from an Initiator with a pending UNIT ATTENTION

if

the drive is reserved

condition (before the Target reports CHECK the INQUIRY command and will not clear the

Note

An INQUIRY command directed to an invalid

that

information regarding parameters of the Target be sent

CONDITION status only when the Target

data

will be returned even though the

INQUIRY command will

to

another Initiator.

CONDITION status), the Target will execute

UNIT ATTENTION condition.

LUN

(

=I

0) will return a

Peripheral Device Type of 7FH (Logical Unit Not Present) in byte 0 of

9

Byte

00 01 02 03 04 05

parameter list. This condition is not considered an error. The INQUIRY

if

command will be executed with no error reported even

reserved by

7

(Logical Unit Nwnber)

LUN

Ito

a different Initiator.

Inquiry Command DeSCriptor Block

Bit

I

6

I

5

4

I

Opcode = 12H

I

VPD Page Code

Reserved

Allocation Length

Control

I

Byte

(COB)

3

Reserved

I

the Target is

2

I

1

I I

the

0

EVPD

EVPD (Enable Vital Product Data) and VPD Identifier. The VPD Identifier field determine the information combinations are:

EVPD

bit

If

EVPD is set

to

0 (zero), and the VPD Page Code

Allocation Length. This field specifies the number of bytes returned Inquiry data. An Allocation Length of zero indicates transferred. This condition will not be considered as an error. Any other value indicates the

DRAFT

1/18/93

09:58

to

be returned

VPD

Page

Code

o

1

OOH OOH SOH EOH

Sense

Additional Sense Code: INVALID FIELD IN CDB.

Target

Standard Supported Unit Serial Number VPD Manufacturing Information VPD

Status:

Key: ILLEGAL REQUEST

Will

Inquiry

Parameter

VPD Page List

is

set

CHECK CONDITION

to

Return:

Page

to

1 (one),

that

SCSI

status

of

the EVPD bit and the

the Initiator. The supported

Page

the

Target will return:

the Initiator has allocated for

that

no INQUIRY

Command Descriptions A·11

data

will be

Inquiry

maximum number

of

bytes

that

will be transferred. The Target will terminate

the

DATA IN phase when the specified number of bytes have been transferred or when all available Inquiry data

have been transferred

Byte

00

01 02 03 04

05-06

07

P

-

/.

i

..

,(.'

1

.'

..

08-15

08

09

10-15

16-31

---

-

16 = C (ASCII) 17 18 = '4 (ASCII) 19

20

21 22 23 24

25-31

32-35

Notes:

1.

For narrow drives, WBUS16 = 0; for wide drives, WBUS16 = 1

7 6 5

...

RMB=O Device

ISO

VER

AENC

RELADR

=1

(MSB=32)

to

the Initiator, whichever is less.

Standard

Peripheral Qualifier

= 0

TRMIOP=O

WBUS32 WBUS16

=0

Inquiry

all zero's = requested LUN is

7FH =

Additional

Note 1

Vendor Identification

Product

0"

--

"

Product

Parameter

Bit

4

,

..

~

(bits

7 - 5) / Peripheral Device

requested

ECMA

Reserved

\

C2486/88: = 8

'::''';'

LUN is

Type

VER=

Parameter

Reserved

SYNC

= H (ASCII) = P (ASCII)

= ASCII

Identification

= 2

C2490: = 9 (ASCII) C2486: = 6 (ASCII)

C2488: = 8 (ASCII)

C2490:

Product Product Product

Product

0 ANSI

Length

=1

Bytes

Sp~<;eS

Bytes

(ASCII)

= 0 (ASCII)

ID (ASCII) ID (ASCII) ID (ASCII)

ID (ASCII)

ASCII~s

Revision

.....

_ .... _ ........

Number

----)

Page

Format

3 2 1

Type

(bits

supported

not

supported

Modifier = 0

Response

(n=1Fh)

LINKED Reserved

=1

(ASCII)

=0

--

.

4 - 0)

Data

Fonnat

CMDQUE

{LSB=35}

VER

=1

0

= 2

SOFTR

=0

A·12

SCSI

Command

Descriptions

DRAFT

1/18/93 09:58

Inquiry

Page Code

OOH:

Supported VPD Page List Format

Bit

Byte

7

I

6

I

5

I

4

I

3

I

2

I

1

I

0

00

Peripheral

Qualifier (bits 7 - 5) /

Peripheral

Device

Type

(bits

4 -

0)

all

zero's =

requested

LUN is

supported

7FH =

requested

LUN is Dot

supported

01

Page

Code =

OOH

02

Reserved

03

Page

Length = 3

04

Page

Code

OOH,

Supported

VPD

Page

List

05

Page

Code

80H, Unit Serial

Number

06

Page

Code EOH,

Manufacturing

Infonnation

Page Code 80H: Unit Serial Number

VPD

Page Format

Bit

Byte

7

I

6

I

5 4

I

3

I

2

I

1

I

0

00

Peripheral

Qualifier = 0 Peripheral Device Qualifier = 0

01

VPD

Identifier = 80H

02

Reserved

03

VPD

ASCII

Data

Length = OAH

04-13

Product

Serial

Number

(ASCII)

DRAFT

SCSI Command Descriptions A·13

1/18/93 09:58

Inquiry

Page

Code

EOH:

Manufacturing

Byte

00

01-04

05

06 07

08-17

08 09

10

11

12

7

6

I

Peripheral

I

Qualifier

all zero's =

7FH =

5

I

(bits

7 - 5) /

requested

VPD

ASCII

Manufacturing

= C (ASCII)

= C2244: = 4 (A.-CII)

= C2245: = 5 (ASCII)

= C2246: = 6 (ASCII) = C2247: = 7 (ASCII)

13

14-16

17 ASCII Space 18-27 28-37

38-47

48

49

50 51

52-54

55

56 57

58

59-87

Notes:

1.

For

wide differential drives,

byte

58 =

SCSI

ESDI

SCSI

Option

HDA Serial

Finnware

Option

(O

Address

= open; 1 =

= ASCII Space

Pin-set

Unit

Auto

SCSI Address byte byte byte

Write

SCSI-l/SCSI-2

ASCII Spaces

Information

Bit

,

I

Peripheral

LUN is

Reserved

Identifier =

Reserved·

Data

Length

Product

= 2 (ASCII) = 2 (ASCII)

="

(ASCII)

Indicator

Number

Revision

Configurations

shorted)

Attention

SDTR

Parity

Spin

Up

52 =

bit

53 =

bit

54

:::

bit

Protect

ASCII

Space

Note 1

bit

3; for all

3

Device

supported

not

supported

EOH

= 50H

Code

(ASCII)

Number Number

2 1 0

other

VPD

I

Type

drives,

Page

2

(bits

byte

Format

I

4 - 0)

58 = ASCII

1

space

0

I

A·14

SCSI

Command

Descriptions

DRAFT

1/18/93 09:58

Mode Select, Mode Sense

Mode

Select,

Mode

Sense

The MODE SELECT command provides a means for the Initiator

to

unit, or peripheral device parameters to the Target. The

MODE SENSE command provides a means for a Target

or peripheral device parameters to the Initiator.

It

is

a complementary command to

to

report its media, logical unit,

MODE SELECT command.

Mode

If

the Target will report CHECK with Additional Initiators but not

Select

Command

Description

a MODE SELECT modifies operating parameters

CONDITION status and UNIT ATTENTION Sense Key

Sense Code of MODIFIED PARAMETERS when next accessed by other

by

the Initiator issuing the MODE SELECT command. This rule does

that

are common

NOT override the normal first access rule for each Initiator, nor does rules for INQUIRY and REQUEST

Mode Select (6-Byte) Command Descriptor Block (COB)

Byte

00

01

02-03

04 05

7

Logical Unit Number

I

6

SENSE.

5

I

(MSB=02)

J

Opcode = ISH

PF

I

Reserved

Parameter

Control

Bit

4

I I

List Length

Byte

.3

(LSB=03)

J

Reserved

specify media, logical

the

to

other Initiators,

it

override the normal

1

I

2

I

0

SP

Byte

02-06 07-08

Note

00 01

09

Mode Select (10-Byte) Command Descriptor Block (COB)

Bit

7

Logical Unit Number

I

6

I

(MSB=02)

(MSB=07)

5

Parameter

I

Opcode

I

Reserved

Control

4

= 5SH

PF

List Length

Byte

I

3

(LSB=06)

2

I

Reserved

(LSB=08)

I

1

I I

0

SP

Bit 7 of the Mode Select control byte will enable (1) or disable (0) the Write Protect mode. The the Write Protect status: 1

WP

bit in the Mode Sense parameter list header reports

= enabled, 0 = disabled.

DRAFT

1/18/93

09:58

SCSI Command Descriptions A-15

Mode Select, Mode Sense

PF

(Page Format) A format. When set both formats are

PF

to

zero (0), the

the

same and

bit

setto

the

one (1) indicates

data

is sent in the vendor unique format. For this product

PF

bit is ignored.

that

the

data

is sent in the

SCSI~2

page

SP (Save Page) Thls bit indicates

If

the

command.

SP bit is set

that

the Target should save any savable pages

to

one (1), the current block size and drive capacity will also be

sent

with this

saved. Parameter List Length This field specifies the length in bytes

parameter list zero indicates

that

will be transferred during the

that

no

data

will be transferred. This condition is not considered as an error.

Data

Out

of

the MODE SELECT

phase. A parameter list length

of

non-zero, the parameter length must contain a header and optionally a Block Descriptor (if

is

Block Descriptor Length

8) and optional Parameter Pages.

The currently supported Mode Select Pages are:

Page

Codes

OlH

02H 03H 04H 08H 09H

OAH

Read Device Disconnect/Reconnect

Direct Access Device

Rigid Disk Drive Geometry

Cache Peripheral Control Mode

Parameter

Write

Control

Device

Error

Recovery

Parameters

Pages

Fonnat

Parameters

The minimum page length accepted is 2 bytes (page code plus length). The Page Length field must exactly match the values supplied in the Mode result in a Additional

Status of CHECK CONDITION, a Sense Key of ILLEGAL REQUEST, and an

Sense Key of INVALID FIELD

IN

CDB.

Sense data. megal parameter lengths will

If

A·16

SCSI

Command Descriptions DRAFT

1/18/93 09:58

Mode Select,

Mode

Sense

Mode

Sense

Byte

00 01 Logical 02 03 Reserved

04

05

byte

00 01 02

03-06 07-08

09

Command

Mode Sense (6-Byte) Command Descriptor Block (COB)

7

I

PC

Mode Sense (10-Byte) Command Descriptor Block (COB)

7

I

Logical

PC

Description

6

Unit

Number

6

Unit

Number

(MSB=07)

I

5

Allocation

5

Bit

4

I

Opcode = lAH

Reserved

I

Length

Control

I

Opcode

Byte

Bit

4

= 5AH

I Reserved I

Reserved

Allocation

Control

Length

Byte

3

I

I DBD

Page

3

I

DBD

Page

I

Code

I

Code

(LSB=08)

2

I

Reserved

I

Reserved

1

I

0

DRAFT

1/18/93

09:58

SCSI Command Descriptions A-17

Mode Select, Mode

Sense'>

DBD (Dbable Block any block descriptors. A DBD bit of:zero (0) indicates be

returned. A

PC

(Page Control). This field defines the Parameter Page type

Ueseriptors).This

DBDbit

of

one

field 'indicates whether

(l)jndicates

that

no block descriptors will be returned.

values for this field are:

00 = Report SELECT executed since the last

Current Values: Returns

command; or

the

saved values if a MODE SELECT command has not been

Power On, Hard Reset, or Bus Device Reset; or the default values if

the

parameters set in

saved values are not available. 01

= Report Changeable Values: The changeable values are listed in

that

table 10

= Report Default Values: The default values are listed

that 11

= Report Saved Values: Returns

(Savable Pages

format ta.ble.) The

follows each of the page format tables.

the

saved values of

are indicated in the following table and in the title block for each page

Save Block size

is

reported in the Block Length field of

the

Descriptor.

Page Code. This field specifies which page(s) are supports

the

following Mode Sense page codes:

to

be returned

or

not

the

target will

zero

or

more block descriptors will

to

be returned.

the

last successful MODE

the

in

the Parameter Values table

The

Parameter Values

requested Parameter Pages.

the

Block

to

the initiator. The

return

supported

target

Page

Code

OOH OIH

02H 03H 04H

OSH

09H

OAH

3FH

Retwn

Error

Recovery Device Disconnect/Reconnect Direct Rigid Disk Drive Geometry Cache Peripheral Control Mode Retwn

Allocation Length. This field specifies the number of bytes returned data

the maximum number of bytes

MODE SENSE data. An Allocation Length of zero indicates

will be transferred. This condition is not considered an error. Any other value indicates

that

will be transferred. The target will terminate the

Description

No

Pages

Parameters

Access Device

Control

All

Parameters

Device

Parameters

Pages

Parameters

Format

Parameters

that

Savable

nfa

Yes Yes Yes No Yes Yes Yes

n/a

the

initiator has allocated for

that

no MODE SENSE

phase when the specified number of bytes have been transferred or when all available

SENSE

data

have been transferred

to

the initiator, whichever is less.

Data

MODE

In

A·18

SCSI

Command Descriptions

DRAFT

1/18/93 09:58

Six-Byte Parameter Formats

Mode Select, Mode Sense

The 6-byte

parameter

Descriptor, followed by

Byte

00 01 02 03

Byte

04

05-07

08

09-11

7

WP

7

I

J

formats contains a 4-byte header followed by an optional Block

the

requested page.

6·Byte Parameter List Header Format

Bit

6

Reserved

6·Byte Block Descriptor Format (Optional)

6

(MSB=05)

(MSB=09)

I

5

I

Sense

Media

I

Block

I

Density Number

4

Data

Type

DPOFUA

Descriptor

Bit

4

Code

Of

Reserved

Block

Length

I

Length

= 0

I

Length

I

= 0

Blocks

3

I

(LSB=07)

(LSB=l1)

2

Reserved

2

I

1

t

1

J

0

Byte

00 01

02-nn

7

PS

6 5

Reserved

Refer

Parameter List Page Format

Bit

4

to

the

Parameter

I

Page

Length

Specification

I

in

Bytes

Parameters

Page

Tables

3

Code

that

I

2

follow.

I

1

I

0

DRAFT

1/18/93 09:58

SCSI Command Descriptions A·19

Mode Select, Mode Sense

Ten-Byte Parameter Formats

The

10-

byte

parameter

Descriptor, followed by

Byte

00-01

02 03

04-05

06-07

Byte

08

09-11

12

13-15

7

WP

7

formats contains an 8-byte the

requested page.

10-Byte Parameter List Header Format

6

I

(MSB""06)

I

(MSB:::;;OO)

Reserved

10-Byte Block Descriptor Format (Optional)

6

I

(MSB=09)

(MSB:::;;13)

5

I

Sense

Media

I

Block

I

Density

Number

Bit

4

Data

Type

DPOFUA

Reserved

Descriptor

Bit

4

Code

Of

Reserved

Block

Length

header followed by an optional Block

I

Length

3

2

I

(LSB:::;;Ol)

I

1

I

= 0

(LSB=07)

2

I

(LSB=ll)

Reserved

I

1

I

Len.gth

I

= 0

Blocks

3

(LSB=15)

0

Byte

00 01

02-nn

7

PS

I

Reserved

I

6

Refer

Parameter List Page Format

Bit

I

to

5

the

Parameter

Page

4

I

Length

Page

Parameters

Specification

in

I

Page

Bytes

..

Tables

3

Code

that

I

2

follow.

J

1

I

0

A-20 SCSI Command Descriptions

DRAFT

1/18/93 09:58

Mode Select, Mode Sense

Sense during the

Data

Length. This field specifies the length in bytes of the page

Data

In phase. The Sense

Data

Length field does not include itself nor does

data

to

be returned

it

include the Block Descriptor length.

Media Type. WP

(Write

Set to all zeros

Protect).

Indicates whether the drive is in the write protect mode: zero (0) =

to

indicate fixed disk.

write protect disabled; one (1) = write protect enabled. The write protect mode is enabled or disabled with bit 7 in the Mode disabled; one (1)

= write protect enabled.

DPOFUA. Indicates whether the target supports Out)

and FUA (Force Unit Access) in the extended READ command. The

reports

a zero (0) indicating

that Device Specific Parameters. Not used. Set Block Descriptor Length. This field specifies the length in bytes of

does not include the

Parameter Pages. The block descriptor length will be either 0 or

Block Descriptor specifies the media characteristics for the entire Logical Density Code. Not used. Set Number

of

Blocks. Set to all zeros by MODE SENSE indicating

same size. In MODE SELECT, used by the Set Capacity function

Select command control byte: zero (0) = write protect

the

cache control bits DPO (Disable Page

target

only the FUA bit is supported.

to

all zeros.

the

Block Descriptor, and

Unit.

to

zeros.

that

all blocks are set

to

allow

the

always

8.

Initiator

The

to

modify the working capacity of the drive. The

Set Capacity function is performed by placing a value in the Number of Blocks field of

the

6-

or lO-byte MODE SELECT Block Descriptor. The change

the

drive can be made non-volatile by setting the SP (Save Page)

to

the working capacity of

bit

in the MODE SELECT

Command Descriptor Block to one (1). Considerations for setting of Number of Block field:

If

set

to

zero (0), the working capacity is not affected.

If

set

to

FFFFFFh,

If set to a value greater than zero

capacity, the working capacity is adjusted

If

set

to

a value greater than

CHECK

CONDITION, a Sense Key oflLLEGAL REQUEST, and an additional Sense Key

of ILLEGAL LOGICAL

Attempting any access beyond the current working capacity

the working capacity is set to maximum.

(0),

but

less than'or-equal

to

the

number of blocks indicated.

the

maximum drive capacity, the drive will set a Status of

BLOCK ADDRESS.

of

to

the

maximum drive

the

drive will result

in

a Status of CHECK CONDITION, a Sense Key of ILLEGAL REQUEST, and an Additional Sense Key of ILLEGAL LOGICAL

Block

Length. Indicates logical block size; Set MODE SELECT, changing the Block Length (or changing field

in

Mode Page 03H) will reset the working capacity to the maximum.

PS (Page Save). Indicates savable Mode Sense page when set

BLOCK ADDRESS. .

to

user configuration in MODE SENSE. In

the

Data

Bytes per Physical Sector

to

one (1). Ignored for Mode

Select.

Length. Indicates number of bytes remaining in specified page after Page Length field.

Page

DRAFT

1/18/93 09:58

SCSI

Command Descriptions A·21

Mode Select, Mode.Sense

Parameter

Specifications

for

Supported

Pages

The following tables list the parameter formats for all supported pages, their respective

default values, and indicates whether the

field

values are changeable or non-changeable with

the Mode Select command.

If

a field

is

changeable, the allowable range is given.

In

addition,

the title block for each page indicates whether the page

is

savable.

A·22 SCSI Command Descriptions

DRAFT

1/18/93 09:58

Mode Select, Mode Sense

Page

Byte

00

01 02 03 04 05 06 07

07 08 09

10-11

Code

01H,

ReadfWrite

7

PS

AWRE

6

Reserved

Page

ARRE

SCSI

(MSB=10)

Error

Length

(CCS):

SCSI

SCSI-2

Page

Recovery

5

in

Bytes:

TB

Retry

Data

(CCS):

Bytes

Write

Recovery

01

Parameters

Bit 4

I

SCSI

(CCS)

RC

I

Count;

SCSI-2:

Correction

Head

Strobe

Recovery

H Parameter

Offset

time

Follow

Reserved

Retry

Reserved

Time

Span Count

Count

I

Page

= 06;

I

Count

Limit

Values

3

Code

SCSI-2 = OA

EER

Read

Retry

(last

(Savable

I

= 01H

PER

I

Count

byte)

(LSB=ll)

Page)

2

I

1

DTE

I

0

DCR

Parameter

AWRE

(Automatic

ARRE

(Automatic

TB

(Transfer Block) 0 Yes o = Disable; 1 =

RC

(Read

Continuous)

EER

(Enable

PER

(Post

Error)

DTE

(Disable

DCR

(Disable

Read

Retry Correction Head Data Write Recovery

Recovery

Span

Offset

Strobe

Retry

Time

Write

Reallocation)

Read

Reallocation)

Early

Recovery) 0

Transfer

Correction)

Count

Offset

Count

on

Error)

(Bits

per

Sector)

Count (SCSI-2 only)

Limit:

SCSI

(CCS)

Limit:

SCSI-2 0000 Yes SCSI-2: 0000 = use

Default

Values Values

(hex)

Changeable

0 Yes o = Disable; 1 = 0 Yes o = Disable; 1 =

data

0

1 0 Yes 1 = Disable; 0 =

0 Yes 1 = Disable; 0 =

08

48

0 No 0 No 8

FF

No No

Yes o = Disable; 1 =

Yes Yes

Yes o

No

nla

errors

Maximum 0,24

(I8H). nla nla

to

255

SCSI

(CCS):

allowed.

Counts).

Allowable

Enable Enable Enable

Enable

allowable

retries

72 (48H)

FF = maximum

defaults

Ranges

transfer

posting

transfer

error

correction

= 255

number

(i.e.

of

errored

of

recovered

on

recovered

(FFH)

Retry

of

retrys

DRAFT

1/18/93 09:58

SCSI Command Descriptions A·23

Mode Select, Mode Sense

Page Code 02H, Disconnect/Reconnect Parameters (Savable Page)

Bit

Byte

00 01 02

03 04-05 06-07 08-09 10-11

7

PS

6 5

Reserved

Page

Length

(MSB=04)

(MSB=06)

(MSB=08)

in

Bytes;

SCSI

I

SCSI

Buffer Full

Buffer

Empty

Bus

Inactivity

Disconnect

Connect

(CCS):

Reserved (last

4

(CCS):

Ratio

Time

i

Page

= OAH;

Ratio

Limit

3

Code

SCSI-2:

bytes)

i

= 02H

(L5B=05)

(LSB=07)

(LSB=09)

2

= OEH

J

1

0

10-11

12

13-15

Buffer Full Buffer

Empty

Bus

Inactivity Disconnect Connect Maximum DTDC

Control)

Time

(SCSI-2 only;

(MSB=lO)

Parameter

Ratio

Limit

Time

Limit

Burst

Size (SCSI-2 only) 0000

Data

Transfer

Disconnect

SCSI-2

Bytes

Maximum

Reserved

Follow

Burst

Reserved

Size

Page 02H Parameter values

Default

Values

(hex)

CO

co

0004 0000 0000

00

Changeable

Values

Yes Yes Yes Yes Yes Yes Yes

00

0000

0000 = No

0000

•

OOB

• 01B = No discolmect

• 11B = No disconnect once

started

• lOB = Reserved

(LSB=l1)

to

FF

to

FF

to

FFFF

to

FFFF

to

FFFF

= Disconnect

until

Allowable

(ignored)

limit

command

I

Range

as

controlled

during

complete

DTDC

data

by

ratios

transfer

A-24 SCSI Command Descriptions

DRAFT

1/18/93 09:58

..

Mode

Select,

'Mode

Sense

Page

Tracks

Tracks Alternate Alternate Alternate Alternate Alternate Alternate Alternate Sectors Data

Interleave: Track Skew Factor: Cylinder Skew Factor: SSEC (Soft Sectored) HSEC RMB (Removable Media) 0 SURF

Code

Byte

00 01

02-03 04-05 06-07 08-09 10-11 12-13 14-15 16-17 18-19

20

21-23

per per

per

Bytes

(Hard

(Surface Mode Addressing)

03H, Direct

7

PS

SSEC HSEC

Parameter

Zone: C2486 Zone: C2488 Zone: C2490

Sectors

per

Zone: all

Tracks

per

Zone: C2486

Tracks

per

Zone: C2488

Tracks

per

Zone: C2490

Tracks

per

Logical Unit: C2486

Tracks

per

Logical Unit: C2488

Tracks

per

Logical Unit: C2490 02F7

Track: all 0060

per

Physical Sector: all

all

Sectored)

Access

6

Reserved

(MSB=02) Tracks

(MSB=04)

(MSB=06)

(MSB=08)

(MSB=lO) Sectors

(MSB=12)

(MSB=14) Interleave

(MSB=16) Track Skew

(MSB=18)

Device

5

Alternate

Data

RMB

Page

Alternate

03H

Default

Value

(bex)

OE8F No

OOAF

0260

Format

Bit 4

I

Length

In

Bytes: 16H

per

Sectors

Tracks

per

Bytes

per

Physical Sector

Cylinder Skew

SURF

I

Reserved

Parameter

Cbangeable

Value

12B9 No 16E3 No

0000

OOEI

0113

01E3

0200

0001

OOOE

0020 No

0 No

1 No

0 No

No No No No No No No No

Yes

No No

No

(Savable

3

I

Page

Code = 03H

Zone

per

Zone

per

Zone

Logical Unit

Track

Factor

I

values

n/a n/a n/a n/a n/a

n/a

Per bytes

bytes.

n/a n/a n/a n/a n/a n/a n/a

Page)

I

(LSB=03)

(LSB=07)

(LSB=l1)

(LSB=15)

(LSB=17)

(LSB=19)

customer

to

744 (2E8H)

2

(LSB=05)

(LSB=09)

(LSB=13)

Reserved

Allowable

requirement.

I

bytes

1

Range

From

in

.increments

0

I

180 (B4H)

of

2

DRAFT

1118193

09:58

SCSI

Command

Descriptions

A·25

Mode Select,

Mode

Sense

Page Code 04H, Rigid disk Drive Geometry Parameters (Non-Savable Page)

Bit

Byte

00

01

02-04

05 06-08 09-11 12-13

14-16 17-19

7

PS

(MSB=09)

6

Reserved

Page

(MSB=02)

(MSB=06)

(MSB=14)

Length

Starting

(MSB=12)

SCSI

5

In

Bytes:

Starting

I

SCSI

Number

Cylinder,

Drive

Landing

(CCS):

4

(CCS)

Of

Cylinders

Of

Heads

Write

Reduced

Step

Rate

Zone

Cylinder

Reserved

I

Page

= 12H;

Write

(last

3 Code

SCSI-2

Precomp

Current

bytes)

2

I

= 04H

= 16H

(LSB=04)

(LSB=042)

(LSB=08)

(LSB=13)

(LSB=16)

i

(LSB=l1)

1

I

0

17

18

19 20-21 22-23

Number Number Number Number Starting Starting

(Not Drive Landing RPL

Locking)

Rotational SCSI-2

Media

Of Of Of

Used)

Step

(SCSI-2 only;

only)

Rotation

Parameter

Cylinders Heads: C2486 = Heads: C2488 = 14

Of

Heads: C2490 = 17 Cylinder: Cylinder:

Zone

Rate

Cylinder

Offset

Write Reduced

Rotational

(from

Rate

(SCSI-2 only)

11

Precomp

Write

input

(MSB=20)

(Not Used)

Current

Position

sync signal;

SCSI-2

Bytes

Reserved

Media

Follow

Rotational

Reserved

Rotation

Reserved

Offset

Rate

Page 04H Parameter values

0803

OB

OE

11

0000

00

1518

Changeable

Values

No No No No No No

No No

Yes

No

nla nla nla nla nla nla

nla

• 00 = No locking

• 01 = Slave

• 0-

revolution nla

Default

Values

(hex)

000000 000000

000000

(LSB=21)

10 = Master

255

(Note:

of

I

Allowable

each

unit

the

disk.)

RPL

Range

represents

1/256th

A~26

SCSI

Command

Descriptions

DRAFT

1/18/93 09:58

Mode Select, Mode Sense

Page Code

Byte

00 01 02

03 04-05 06-07 08-09 10-11

12

13 14-15

16 17-19

OSH,

Cache Control Parameters (Savable Page)

Bit

7

PS

IC

Demand

FSW

6

Reserved

APBF Read

(MSB=04)

(MSB=06)

(MSB=08)

(MSB=lO)

Reserved

(MSB=14)

(MSB=17)

Retention

5

Page

CAP

Priority

Disable

Maximum

DRA

Number

Non-CaclJe

4 3

1

Length

DISC

I

Pre-Fetch

Minimum

Maximum

Pre-Fetch

I

of

Cache

Segment

Reserved

In

Bytes

Transfer Pre-Fetch Pre-Fetch

Segments

Segment

Page

= 12H

SIZE

Length

Ceiling

Size

I

Code = 08H

I

Write

(LSB=07)

(LSB=09)

Reserved

(LSB=15)

(LSB=19)

2

WCE

Retention

(LSB=05)

(LSB=l1)

I

Priority

1

MF

I

1

0

RCD

DRAFT

1/18/93 09:58

SCSI Command Descriptions A·27

ModeSelect,Mode

Sense

Page 08H Parameter values

IC

(Initiator

ABPF

(Abort

CAP

(Caching

DISC

(Discontinuity)

SIZE

(Size

WCE

(Write

MF

(Multiplier

RCD

(Read Demand Write Disable Minimum Maximum Maximum FSW DRA Number Cache

Non-Cache

Read

Retention

Pre-Fetch

(Force

(Disable

of

Segment

Parameter

Control)

Pre-Fetch)

Analysis

Enable)

Cache

Factor)

Cache

Retention

Priority

Pre-Fetch

Pre-Fetch Pre-Fetch

Sequential

Read-Ahead)

Cache

Segments

Size

Segment

Default

Values

(HEX)

Pennitted)

Enable)

Disable)

Priority

Transfer

Length

Ceiling

Write)

Size 000000

a

-

a

1

0

a a a

0

a

FFFF

0000 0080 0080

a a

2

FFFF

Changeable

Values

Yes

No

Yes

No

Yes

No

Yes

No

No Yes Yes Yes Yes

No Yes Yes Yes

No

Allowable

ignored 1 = Use control

a = Use

nla

ignored 1 =

a = Disable

nla

number

caching

adaptive

Enable

Caching

n/a

a = Disable; 1 =

nla

1 = Disable; a =

nla

0000 -

FFFF

(ignored)

0000 -

FFFF

logical blocks

0000 -

FFFF

logocal blocks

0000 -

FFFF

(ignored)

nla

a = Enable; 1 =

--

1,2,4,8, Depends

and

upon

size of

or

16

RAM

Number

nla

of

cache

algorithm

Enable

Disable

buffer

Range

segments

Analysis

TFack

of

Cache

in

bytes

Caching

Segments

to

field

A·28 SCSI

Command

Descriptions

DRAFT

1;18/93 09:58

Mode Select, Mode Sense

Page Code 09H, Peripheral Device Parameters (Savable Page)

Bit

Byte

00

01 02-03 04-07 08-10

11

7 6 5

PS

Reserved

(MSB=02)

(MSB=08)

Page 09H Parameter values

I

Page

Length

Interface Identifier

Reserved

Interface

Specific

Reserved

4

I

Page

In

Bytes = OAH

Parameters

3

I

Code = 09H

(LSB=03)

2

(LSB=lO)

I

1

I

0

Parameter

Default

Values

(HEX)

Interface Identifier 8000 Interface Specific

Parameters

000000 Yes

Changeable

Values

No 8000 = SCSI

•

• All

Byte

8,

bit

o =

copy RAM 1 =

do

lost

on

Byte

8,

bit

o =

enable 1 =

disable

and

execute

commands,

Byte

8,

bit

alignment

o =

align

1 = always bit 6 state

other

should

be

Allowable

5:

drive

to

media

not

copy

power

6:

Auto-head

automatic

them

check

7:

Rezero

control

current

align

bit

positions

set

to

error

on

error

log; log

cycle

or

on

bit

Unit

head

all

zero (0)

Range

and

fault

only

contents

bus alignment

head

Rezero

7

command

heads

are

reserved

log from

will

reset

control

alignments

Unit

head

regardless

and

be

of

DRAFT

1/18/93

09:58

SCSI Command Descriptions A-29

Mode Select, Mode Sense

Page

Byte

00 01 02

03

04

05

06-07

Code

OAH,

EECA

Control

7 6

PS

Queue

Reserved

Algoritlun Modifier

Page

Parameter

RLEC

(Report

Queue

Algoritlun Modifier 1

QErr

(Queue

DQue

(Disable Queuing) 0

EECA

(Enable

Allegiance) RAENP UAAENP EAENP Ready

AEN

Notes:

1.

AEN = Asynchronous

Log

Error

Extended

(Ready

AEN Permission)!

(Unit

Attention

(Error

AEN

Holdoff

Exceptions)

Management)

Contingent

AEN

Permission)l

l

Period

Event

Permission)l

Notification

Mode

OAH

Parameters

5

I

Page

Length

Reserved

Ready

AEN Holdoff

Bit

4

In

Bytes

Reserved

(Savable

3

I

Page

Code = OAH

= 06H

I

Reserved

Period

Parameter values (Savable)

Default

Values

(HEX)

0000

0

Changeable

Values

Yes

No No

No No No No

o = Disable; 1 =

Exception

o =

reordering 0=

nfa

nfa nfa nfa

nfa

Page)

I

-.-

..

!

RAENP

Conditions

Restricted

Continue; 1 =

2

UAAENP

Allowable

Enable

reordering; 1 =

Abort

1 0

QErr

Range

reporting

of Log

Unrestricted

RLEC

DQue

EAENP

A-30 SCSI Command Descriptions

DRAFT

1/18/93 09:58

Read

The READ command requests

both

the

accepts

Byte

00

01

02-03

04

05

Byte

00 01

02-05

06

07-08

09

non-extended (6-byte) and extended (lO-byte) CDB formats.

Read (S-Byte) Command Descriptor Block (CDB)

7

Logical

7

Logical

6

I

Unit

Number

(MSB=02)

Read (10-Byte) Command Descriptor Block (CDB)

6

I

Unit

Number

(MSB=02)

(MSB=07)

that

I

the

Target transfer

5

I

Opcode

J

Logical Block

Transfer

Control

5

1

Opcode

DPO=O

I

Logical Block

Reserved

Transfer

Control

Bit

4

Bit

4

I

= 08H

Address

Length

Byte

J

= 28H

I

Address

Length

Byte

data

to

the

3

I

Logical Block

3

1

FUA

I

(LSB=08)

Initiator. The Target

2

Address

(LSB=03)

2

Reserved

(LSB=05)

I

(MSB)

I

.1

1

I

0

RelAdr

Logical Block Address. This field specifies

the

logical block

at

which the read operation will

begin. DPO (Disable Page Out). Not supported. Must be set to 0 (zero). FUA (Forced Unit Access). A zero (0) instructs the target

a one (1) instructs the target RelAdr (Relative Address). A one (1) indicates

to

satisfy

data

demand from

that

to

satisfy

the

media.

the

logical block address field is a two's complement displacement. This negative or positive displacement is logical block address last accessed on command. This feature previous command in

A RelAdr

bit

of zero (0) indicates

is

only available when linking commands. The feature requires

the

linked group has accessed a block of

block of the range of logical blocks Transfer Length. This field specifies

the

transferred. When using

that

256

indicates

logical blocks will be transferred. When using the extended (lO-byte) CDB

non extended (6-byte) CDB format, a Transfer Length

format, a Transfer Length of zero indicates condition is not considered an error (no SEEK occurs, and no

data

The most recent

value written in the addressed logical block( s) will be returned.

the

logical unit to form

the

logical block address for this

data

that

the logical block address field specifies

to

be operated on by this command.

the

number of contiguous logical blocks of

that

no logical blocks will be transferred. This

data

demand from cache;

to

be added to

the

on the logical unit.

the

first logical

data

to

of

is

transferred).

that

be

zero

a

DRAFT 1/18/93

09:58

SCSI

Command Descriptions A-31

Read

Buffer

The READ as

a diagnostic tool for testing Target memory and does not alter the media or contains

Byte

00

01 Logical

02

03-05 06-08

09

Mode. Modes 0 by the

Buffer ID. This field

Buffer Offset. This field Allocation Length. This

returned data.

BUFFER

command is used in conjunction with the

the

buffer. The

data

a 4-byte header, followed by the buffer data.

Read Buffer Command Descriptor Block

Bit

7

(OOOb)

data

bytes, and Mode 3 returns only the 4-byte header.

An

allocation length of zero specifies

I

6

Unit

Number

(MSB=03)

(MSB=06)

I

5

I

Opcode = 3CH

I

Buffer ID = 0

Buffer Offset = 0

Allocation

4

Control

and 3 (OUb) are supported. Mode 0 returns a 4-byte header followed

is

not supported and should be set

is

not supported and should be set

field

specifies the number of bytes

considered an error. The target will terminate the

bytes or when all available buffer

data

has been transferred, whichever is less.

WRITE

the

SCSI bus integrity. This command

returned by the READ

(COB)

I

Reserved

Length

Byte

that

Data

3

to

zero (0).

to

that

no

data

Phase when the specified number of

2

I

1

(LSB=05)

(LSB=08)

zero (0).

the

initiator has allocated for

be transferred and is not

BUFFER

1

I

Mode

command

0

I

Read Buffer Header Format

Bit

Byte

00

01-03

7

I

6

(MSB=Ol)

Available Length. This field may contain up to 262,144 bytes

that

Length of zero indicates

is

the CDB adjusted

data

The

too small

to

reflect the truncation.

in the buffer may have been altered since the last

recommended

that

to

the Target be placed in reserve or

and subsequent READ

the

test

Target's

data

buffer.

no

allow all of the Available Length, the Available Length field is NOT

BUFFER

5

I

data

transfer will take place.

4

I

Reserved

A vailable

command be linked

I

Length

that

to

3

WRITE

the

ensure

2

1

(LSB=03)

(1

's-based 256K). An Available

If

the

Allocation Length of

BUFFER

WRITE

that

BUFFER

the

1

I

command.

command

initiator can reliably

If any command has been executed by the controller between the execution of the

BUFFER will be returned. In this case, the sense information set. The amount of requested buffer error

A-32 SCSI Command Descriptions DRAFT

command and

status,

but

the

READ

BUFFER

data

command, a status of CHECK CONDITION

will be returned regardless of the MISCOMPARE

the contents should be suspect.

wi11

have a Sense Key of MISCOMPARE

0

I

WRITE

It

is

1/18/93 09:58

Read Capacity

The READ CAPACITY command provides a means for the Initiator

to

request information

regarding the capacity of the logical unit.

Read Capacity Command Descriptor Block

(COB)

Bit

Byte

7

I

6

I

5

I

"

I

3

I

2

I

1

I

0

00

Opcode

= 25H

01 Logical

Unit

Number

I

Reserved

I RelAdr=O

02-05

(MSB=02)

Logical Block Address

(LSB=05)

06-07

Reserved

08

Reserved

I

PMI

09

Control

Byte

PMI

(Partial Media Indicator). A PMI bit of zero (0) indicates

that

the information returned

in

the

READ CAPACITY

Data

phase will be the logical block address and block length (in

bytes) of the

last

logical block of the logical unit. The Logical Block Address field in

the

CDB

must be set

to

zero for this option.

If

the PMI bit is zero (0) and the logical block address

is

not zero, the Target will return a Status of CHECK CONDITION, a Sense Key

of

ILLEGAL

REQUEST, and an Additional Sense Code of ILLEGAL FIELD IN CDB.

A PMI bit of one (1) indicates

that

the information returned in

the

Data

phase will

be

the

logical block address and block length (in bytes) of

the

last logical block address after which

a substantial delay in

data

transfer

will

be encountered. This logical block address shall be

greater than or equal

to

the

logical block address specified in

the

CDB. (Implementor's Note:

This function

is

intended

to

assist storage management software in determining whether there

is sufficient space on the current track, cylinder, etc.

to

contain a frequently accessed

data

structure such as a

file

directory or

file

index without incurring

an

access delay. The address

returned will normally be

the

last block on the addressed track.) .

Read Capacity Data Format

The format

of

the information returned by the Target during

the

Data

In

phase of

the

command is as follows:

Bit

Byte

7

I

6

I

5

I

"

I

3

I

2

I'

1

I

00-03

(MSB=OO) Logical Block Address

(LSB=03)

04-07

(MSB=04)

Block

Length

(LSB=07)

0

DRAFT

SCSI

Command Descriptions A·33

1/18/93

09:58

Read Defect Data

The

data

03-06 07-08

READ

to

Byte

00 01 02

09

DEFECT

the

Initiator.

DATA command requests

Read

7

I

Logical Unit

Reserved

Defect

6

J

Number

(MSB=07)

Data

5

that

Command

Bit

4

Opcode = 37H

PLIST

Reserved

Allocation

Control

the

Target transfer

Descriptor

-3

1

GLIST

I

Length

Byte

Block

1

Reserved

I

(LSB=08)

(COB)

2

Defect

the

I

media

1

List

Fonnat

defect

I

0

PLIST (Primary

the

Initiator

that

the

of

both

Defect List The

bit

list

in

the

requested,

requests a primary list of defects be returned. A GLIST

Initiator

lists is requested.

Format.

states

are as defined by

physical sector

the

list will be

Allocation Length.

for

returned

and should

bytes

that

data.

not

be considered an error. Any

shall

be

allocation length

Defed

requests

List), GLIST (Grown Defect List). A PLIST bit of one (1) indicates

the

grown list

If

both

bits are zero (0), only

This field indicates

the

format

(5)

returned

Additional Sense Code

This

field specifies

An

Allocation Length of zero indicates

of

defects.

the

preferred format for

FORMAT UNIT command.

or

bytes from index (4) format.

in

the

bytes from index format

Status:

Sense Key

the

CHECK RECOVERED DEFECT

number

other

transferred.

or

all available READ

The

Target shall

DEFECT

bit

of one (1) indicates

If

both

bits are one (1),

the

header will be returned.

CONDITION

ERROR

LIST

NOT

of

bytes

that

value indicates

terminate

the

The

and

FOUND

the

no

data

the

data

returned

Target will

If

Initiator

maximum

phase when

any

other

the

target

should

the

combination

defect list.

return

format

will

has allocated

be

transferred

number

either

DATA has been sent, whichever is less.

the

is

return:

of

the

A-34

SCSI

Command

Descriptions

DRAFT

1/18/93 09:58

Read Defect Data Defect List Header Format

02-03

00-02

04-07

The

Byte

00 01

Byte

03

.

data

7

(MSB=04)

6

I

Reserved

(MSB=02) Defect List

6

I

(MSB=OO)

Sector

Byte

returned by the READ

5

I

Defect List Descriptor Format

5

I

Number

Index of Defect (Bytes from Index Format)

DEFECT

I

Cylinder

Head Number of Defect

Of

followed by zero or more Defect Descriptors

Read Defect Data

Bit

3

I

"

Reserved

PLIST

Bit

4

Number

Defect (Physical Sector Format) (LSB=07)

DATA

GLIST

I

Length

3

I

Of Defect

command contains a four-byte Header,

2

I

(LSB=03)

2

I

(LSB=02)

I

Defect List

I

1

Format

..

I

1

0

Defed Descriptors in bytes. available defect list

List Length. This Header field specifies the total length of

If

the Allocation Length field of

data,

the Defect List Length is NOT adjusted

the

CDB is less

the

following Defect

than

the

to

reflect

the

length of the

truncation. The defect descriptors are in ascending address order. Ascending address order for physical sector format is defined as cylinder most-significant and sector least-significant. A sector number of

The defect command cannot be read from the media,

all ones

data

to

(FFFFFFFFH)

is supplied in such a manner

indicates

that

the

entire track has been spared.

that

the list can be issued in a FORMAT

restore the current media reassignment mapping without re-ordering. If the list

the

Target will return:

Status:

Sense

Additional Sense Code:

CHECK CONDITION

Key: MEDIUM

DEFECT

ERROR

LIST

ERROR

DRAFT

1/18/93 09:58

SCSI Command Descriptions A-35

Read Long

The READ LONG command requests the Target Initiator. The

data

transferred will include all header,

to

transfer a specific block of

data,

and ECC (Error Correction

data

to

the

Code) bytes.

Read Long Command Descriptor Block

Bit

Byte

00 01

02-05

06

07-08

09

7

Logical

J

6

Unit

Number

(MSB=02)

(MSB=07)

J

5

4

I

Opcode=

I

Logical Block Address

Reserved

Byte

Transfer

Control

I

3EH

Reserved I

Length

Byte

CORRCT (Corrected). A CORRCT bit of one (1) instructs the Target to correct the by ECC before transferring block

to

be read and transferred without any error detection or correction.

it

to

the Initiator. A CORRCT bit of zero (0) causes the logical

3

(COB)

2

I

(LSB=05)

(LSB=08)

I

CORRCT

1

0

I I RelAdr=O

data

Logical Block Address. This field specifies the starting address for the Read Long operation. The operation will continue for the length specified by the Byte Transfer Length field.

Byte Transfer Length. This field should specify exactly

transfer.

target ILLEGAL Valid and ILl bits will be set (residue) of

If

a non-zero transfer length does not exactly match the available

will terminate

the

command with a Status of CHECK CONDITION, a Sense Key of

REQUEST, and an Additional Sense Code of INVALID FIELD

to

one (1), and the information field will

the

requested lenght minus the requested length in bytes.

the

number of bytes available for

data

IN

CDB. The

be

set

to

length, the

the

difference

A byte transfer length of zero indicates considered an error.

A~36

SCS!

Command DeScriptions

that

no bytes will be transferred and wil not

be

DRAFT

1/18/93 09:58

Reassign Blocks

Reassign

The

REASSIGN BLOCKS command requests

blocks

logical blocks

be relocated by each defect descriptor sent by contents

The The data

other

to

Byte

00 01

02-04

05

Initiator Target reassigns

contained

logical blocks on

Blocks

an

area

on

the

to

the

Grown Defect list (Glist). More

or

location

transfers a defect list

7

Logical

in

of

the

Reassign Blocks Command Descriptor Block COB)

I

Unit

the

logical blocks specified in

the

Target to reassign

logical

unit

reserved for this purpose

than

the

Initiator. This

Primary

6

Number

Defect List (Plist).

5

I

Opcode

I

(MSB=02)

that

contains

Bit

4

Reserved

Control

I

=

om

Byte

the

logical block addresses

physical media used for each logical block address in

the

defect list will be lost,

media shall be preserved.

A specific logical block address may be reassigned more media, a logical block can locations remain on

the

be

assigned to multiple physical addresses (until no more

media).

and

one physical

3

I

Reserved

(LSB=04)

than

once;

the

defective logical

to

record

or

command

2

I

thus,

over

the

defective

logical block

does

not

alter

1

I

to

be

reassigned.

the

list.

but

the

data

the

life

spare

may

the

0

The

in all

the

Note

REASSIGN BLOCKS command is intended

The

single block defect. command is

made

provision

to

allow recovery from a occur on a single track. Therefore, be

accepted by

the

Target is 96. Duplicate entries in

to

handle multiple defects

the

maximum length defect list

to

situation

The

single spare operation.

Reassign Blocks Defect List Header Format

Bit

Byte

00-01 02-03

The

REASSIGN BLOCKS defect list contains a 4-byte header followed by one

descriptors. Defect List Length. This field specifies

follow.

does

not

The

include

The

7

length

6

I

of

I

(MSB=02)

each defect descriptor

5

Defect List Length is equal

the

Defect Header length.

I

Defect List

the

total

to

four times

4

I

Reserved

Length

is

four bytes.

length in bytes

the

3

I

(LSB=03)

number

of

the

of

be

used

to

reassign a

in

a single

where multiple defects

that

will

the

defect list result

2

I

1

I

or

more defect

defect descriptors

and

in

0

that

a

DRAFT

1/18/93 09:58

SCSI Command Descriptions A·37

Reassign

Blocks

Defect List Descriptor Format

Bit

Byte

00-03

The

Defect Descriptor specifies a 4-byte Defect Logical Block Address

defect.

If

the

The

logical defect descriptors, Sense Key will be set SPARE LOCATION AVAILABLE (32H). not reassigned shall be returned in

7

6

I

(MSB=OO)

I

defect descriptors shall

unit

has insufficient capacity

the

command shall terminate with a CHECK CONDITION

to

MEDIUM ERROR.

5

Defect Logical Block Address

be

in ascending order.

the

Information Bytes-of

4

t

to

reassign all of

The

J

additional Sense Code will

logical block address of

3

2

I

(LSB=03)

the

logical blocks specified

that

I

contains

be

the

first logical block

the

sense

data.

1

status

NO

0

I

the

in

the

and

the

DEFECT

During a reassign operation, all

that

block(s), except

If

the

Target is unable but

not contained in

CONDITION be set

to

status

UNRECOVERED READ

logical block address of

contained within

to

recover

the

defect descriptor list,

and

a Sense Key of MEDIUM

the

reassignment defect list and All blocks affected by the reassignment operation

list, are verified following

to

another physical location.

terminated

with CHECK CONDITION

the

additional sense code of SPARE OPERATION FAILED. In this case,

it

remains as

was prior

marked as bad.

This

to

allows a reissue of

data

residing on

the

data

from any of these block( s) affected by

ERROR

the

track with

the

specified defective

defective block(s), is moved

the

command is terminated with

(llH),

ERROR.

and

The

additional Sense Code will

the

information bytes will contain

new defect. These additional defect(s) should

the

command reissued.

but

not included in

reassignment.

If

this second reassignment operation fails,

the

command.

If

the

verification fails,

status,

the

a Sense Key of MEDIUM ERROR,

The

spare

track

on which

same Reassign Blocks c-ommand

the

to

a new physical track.

the

operation

CHECK

be

added

the

defect descriptor

data

will be reassigned

the

command is

to

and

the

media configuration

original verify failed is

to

step

through spare tracks if consecutive spare tracks are defective. Multiple failures of this command probably indicate a hardware failure

..

the

an

A-38 SCSI Command Descriptions

DRAFT

1/18/93 09:58

Receive Diagnostic Results

Receive

Requests

Diagnostic

the

target

to

Results

send

the

initiator.

Receive Diagnostic Results

Byte

00 01 Logical 02

03-04

05

7

Allocation Length. Specifies returned data. A value of

The

an error).

Target will terminate the DATA IN phase when

have been transferred The

target supports the following pages:

OOR 40R

Supported Diagnostic Pages

Translate Address Page

6

I

Unit

Number

(MSB=03)

the

0 (zero) indicates

or

when all available diagnostic

results

I

of

a previous Send Diagnostic command

Command

Bit

5

I

Opcode

4

I

Reserved

Allocation

Control

maximum number

that

Descriptor Block

3

I

=

lCH

Length

Byte

of

bytes

no

data

will

data

to

the

(COB)

T

1

T

2

I

Reserved

(LSB=04)

the

Initiator has allocated for

be

transferred (not considered

the

specified number

bytes have been returned.

of

0

bytes

DRAFT SCSI

1/18/93 09:58

Command

Descriptions A·39

Receive Diagnostic Results

Byte

00 01

02-03

04 05

Byte

00 01

02-03

04

05 06-13 14-21 22-nn

7

RAREA

I

ALTSEC=O I ALTTRK=oj

(MSB=14) (MSB=14)

Page

OOH:

Supported Diagnostic Page

Bit

6

(MSB=02)

Page 40H: Translate Address Page

6

(MSB=02)

(MSB=06)

5

I

5

I

Reserved

Translated Translated

I

Page

-Page

Supported

Translate

I

Pagecode

Translated

4

Code = OOH

Reserved

Length:

Page

Address

Bit

4

= 40H

Reserved

Page

Length

Reserved

Address

I

= 0002' ' .

List:

Page:

I

2 (if

required)

n

(if

required)

3

OOH

40H

3

1

I

(LSB=03)

I

(LSB=03)

I

(LSB=13)

2

I

2

Supplied

Translated

(LSB=21) (LSB=nn)

I

1

Format

I

1

0

.

0

Suppiied

Formatj

Translated Format. Contains

command Supplied Format field. RAREA

Addressing.

1 All or

(Reserved Area). Supported when Translated Format field is set

The

bit

indications are:

part

of the translated address

returned Translated Address is

o No

ALTSEC

part

of

(Alternate

the

translated address is within a reserved

Sedor),

and ALTTRK

o (zero).

Translated Address. Contains

in

the

SEND DIAGNOSTIC command.

DIAGNOSTIC

•

If

the

Logical Block Format is specified:

the

block address will be in

and

the

•

If

the

Physical or Logical Sector Formats are specified,

covers more

the

target

DIAGNOSTIC

Translate Format field .

remaining bytes

than

one address after translation:

will

return

Address

the

will

all posible addresses contained in

To

is

FFFF

(Alternate

address( s)

the

first four bytes of

be

set

The

to

0 (zero) .

the data

Translate field.

the

value from

within a reserved

with

the

remaining bytes filled with zeros.

the

area

Track). Not Supported. Will

Target translated from

will be in

the

field,

and

the

format specified in

the

area specified in

SEND DIAGNOSTIC

to

Logical Block

of

the

of

media.,

the

media.

the

address supplied

The

the

address

to

be

translated

the

SEND

be

set

to

SEND

A-40

SCSI

Command Descriptions DRAFT

1/18/93 09:58

Release

The

RELEASE command is used error for an case,

the

Initiator

Target returns GOOD release option for was previously reserved using the

Byte

00 01 Logical 02

03-04

05

to

attempt

the

RELEASE command allows an

Release Command Descriptor Block (CDB)

7

I

Unit

6

Number

I

(MSB=03)

to

release previously reserved logical

to

release a reservation

status

without altering any

that

other

Initiator

third-party

5

Reservation

reservation option.

Bit

4

I

Opcode = 17H

J

3RDPTY

Identification = 00

Reserved

Control

I

Byte

3

Third

(LSB=04)

units.

is

not

currently active. In this

reservation. A

to

release a logical

2

I

Party

Device

I

ill

It

is

not

third-party

unit

1

I

Release

an

that

0

XTNT=O

3RDPTY

(Third-Party).

specified logical

If

the

option by

ID field.

unit,

same

Initiator

3RDPTY

If

the

3RDPTY

but

only

if

the

reservation was made using

for

the

same SCSI device as specified in

bit is set to zero (0),

bit

is set

the

to

one (1),

third-party

the

Target shall release

the

third-party

the

Third-Party

release option is

the

reservation

Device

not

requested.

DRAFT

1/18/93 09:58

SCSI Command Descriptions A·41

Request Sense

The

REQUEST

Initiator. Only

Byte

00 01

02-03

04 05

The

returned Request Sense

prior

command~

REQUEST unit from status. the

Initiator option, Initiator.

the

Sense

the

Sense information will be cleared by

transfer of

SENSE command requests

the

extended sense

7

Logical

This

SENSE command or until

Initiator

data

is cleared upon receipt of any subsequent command

receiving

Target will assume

the

data.

that

the

Target transfer sense

data

format is supported.

Request Sense Command Descriptor Block (CDB)

Bit

6

I

Unit

Number

data

is

preserved by

that

issued

the

CHECK CONDITION status.

I

5

. I

4

Opcode

1

Reserved

Allocation

Control

I

= 03H

Length Byte

3

Reserved

is valid for a CHECK CONDITION

the

that

Target for

the

receipt of any other command for

the

command resulting in

the

REQUEST

the

REQUEST SENSE command following

the

Initiator

the

In

the

SENSE command is from

I

CHECK

case

data

to

2

status

1

I

returned on

until retrieved by

the

same logical

CONDITION

to

the

logical unit from

of

the

single

the

0

I

the

Initiator same

the

AUo~ation

for returned sense that of zero number of bytes the

specified number of bytes have been transferred or when all available sense transferred (SCSI-CCS) or 28 bytes (SCSI-2) of sense Data

The fatal errors for executed even

If

any nonfatal error occurs during

the

Target will

REQUEST

After

Sense Key if

is set by subsequent command. This is done

Length. This field specifies

data.

four bytes of sense

(0) indicates

that

to

the

data

that

will be transferred.

Initiator, whichever is less. The drive will

Format descriptions.

REQUEST

SENSE command will

the

REQUEST SENSE command.

if

the

drive is reserved

return

the

SENSE command,

the

Sense

the

Data

is returned, all conditions are cleared except for a UNIT

Power~On

Target for

verification failed. the

the

number of bytes

In

the

SCSI (CCS) mode, an allocation length of zero (0) indicates

will be transferred. In

no

data

will be returned. Any other value indicates

The

data.

return

to

another Initiator.

the

execution of

sense

data

with GOOD

the

returned sense

In

this case, the HARDWARE

first REQUEST SENSE,

to

insure

that

the

SCSI-2 mode, an allocation length

Target will

terminate

return

Refer

to

the

REQUEST

the

CHECK CONDITION

The

REQUEST SENSE command will be

the

REQUEST SENSE command,

status.

data

that

diagnostic failures

When a fatal error occurs on a

may be invalid.

and

UNIT ATTENTION is set for

the

Initiator

the

a maximum

and

are observed.

has allocated

the

maximum

Data

In phase when

data

has been

of

22 bytes

SENSE Extended

status

only

to

report

ATTENTION

ERROR

Sense Key

the

"Reset Conditions"

A·42 SCSI Command Descriptions

DRAFT

1/18/93 09:58

Request Sense

SCSI

(CCS)

Request

Sense

Extended Data

Format

Bit

Byte

7

I

6

I

5

I

4

I

3

I

2

I

1

I

0

00

Valid

I

Error

Class=7

I

Reserved

I

Error

Code

01

Segment

Number

= 0

02

FM=O

I EOM=O I

ILI=O I Reserved I

Sense Key

03-06

(MSB=03)

Information

Bytes

(LSB=06)

07

Additional Sense Length =

OEH

08-11

Command

Specific Information

12

Additional Sense Code

13

Reserved

14

Field

Replaceable

Unit

Code = 0

15

FPV=O

I

C/D=O

J

Vendor Unique=O

I

BPV=O

I

Bit

Pointer=O

16-17

(MSB=16)

Field

Pointer

= 00

(LSB=17)

Device

Error

Field

Follows:

(Bytes

18-21)

18

Vendor Unique

DERROR

Status

Code

19

ESDI

Status

Byte

20-21

SCSI Sta.tus

Bytes

,

,-'--

'------,

SCS~~2

--Request

Sense

Extended Data

Format

;~.-~"

Bit

Byte

7

6

I

5

I

4

3

I

2

I

1

I

0

00

Valid

Error

Class = 7

Reserved

I

Error

Code

01 Segment

Number

= 0

02

FM

=0

EOM

= 0 I

ILl

= 0

I Reserved

Sense Key

03-06

(MSB=03)

Infonnation

Bytes

(LSB=06)

07

Additional Sense

Length

= 14H

08-11

Command

Specific Information

12

Additional Sense Code

13

Additional Sense Code Qualifier

14

Field Replacea.ble Unit Code = 0

15

SKSV=O

Sense

Key Specific

16-17

Sense Key Specific

18

Retry=O Reassign=O I

HRDERR=d

Reserved

19-23

Reserved

Device

Error

Field

Follows:

(Bytes

24-27)

24

Vendor Unique

DERROR

Status

Code

25

ESDI

Status

Byte

26-27

SCSI

Status

Bytes

DRAFT

SCSI Command Descriptions A·43

1/18/93 09:58

Request Sense

SCSI-2 Error Code. A bit value of 0 (zero) specifies current error;

a'bit

value

of'

1 (one)

specifies deferred error.

to

Error Class. This field is always equal Valid. When set

information.

to

1, the

The

exact significance of

VALID

bit indicates

7. that

the Information Bytes field contains valid

the

Information Bytes depends on

the

status

of

Sense Key field. Segment Number.

Set to zero (0). Used for Copy and Search commands; not supported in

this product. FM

(File Mark), EOM (End

Sense action to

Key. This field is used

that

should be taken by the initiator.

the Initiator for making decisions based on errors detected by the Target. The Sense Key

of

Media), ILl

to

indicate

(In~orred

the

type of error

It

is

the primary piece of information available

Length

that

Indi~ator).

All set

to

zero (0).

has occurred, and the recovery

codes are:

Value

(hex)

0

1

No

Sense.

logical

unit.

Recovered action

performed

and

the

information

Indicates

Error.

by

that

there

Indicates

the

Target.

bytes.

is

that

Details

no

the

Description

specific sense key

last

command

may

be

completed

determinable

infonnation

successfully

by

examining

to

be

reported

with

some recovery

the

additional

for

the

designated

the

sense

bytes

Not

2

3

4

S

6

7

B

E

Ready.

Media probably

Hardware controller

Dlegal the

additional Unit Data

that

is

Aborted request

Miscompare. WRITE enabled).

Indicates

Error.

Indicates

caused

by

a flaw

Error.

failure, device failure,

Request.

Attention.

Protect.

protected

Command.

/ action.

BUFFER

Indicates

parameters

Indicates

from

Indicates

commands,

that

the

logical

that

the

in

the

media

that

parity

that

there

supplied

that

the

that a command

this

operation.

Indicates

data

in

or

that

buffer

a MIS

unit

command

or

the

Target error,

was

as

data

Target

The

the

may

COMPARE

addressed

terminated

an

error

detected

etc.) while

an

illegal

for

some

has

been

that

reads

read

or

Target

have

cannot

with

in

the

recorded

a nonrecoverable

performing

parameter

commands.

reset

or

or'writes

write

operation

aborted

been

the

corrupted

occurred

be

accessed.

a nonrecovered

data.

the

in

the

there

has

the

media

is

not

command

between

during a VERIFY

error

hardware

command

been a power

was

performed.

due

to

READ

condition

failure (for

or

during

descriptor

on.

attempted

Initiator

BUFFER

(with

BYTCK

a self

block

on a block

and

Additional Sense Code. This field is specific for each sense code and provides additional

the

information about

cause of

that

particular Sense

Key.

that

was

example,

test.

or

in

A·44

SCSI

Command Descriptions

DRAFT

1/18/93 09:58

HP C2488A, C2486A, C2490A Technical Reference Manual

Specifications and Main Features

Frequently Asked Questions

User Manual