Seagate 6451, 6450 User Manual

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Medalist Pro Family

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Medalist Pro 6450 (ST36450A)

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Medalist Pro 6451 (ST36451A)

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ATA Interface Drives

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Product Manual

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Medalist Family

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Medalist Pro 6450 (ST36450A)

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Medalist Pro 6451 (ST36451A)

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ATA Interface Drives

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Product Manual

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© 1997 Seagate Technology, Inc. All rights reserved
Publication Number: 32652-001, Rev. B, June 1997
Seagate, Seagate Technology, the Seagate logo, Medalist and the

Medalist logo are registered trademarks of Seagat e Technology, Inc.
Other product names are trademarks or registered trademarks of their
owners.

Seagate reserves the right to change, wi thout notice, product of ferings
or specifications. No part of this publication may be reproduced in any
form without written permission from Seagate Technology, Inc.

Medalist Pro 6450/6451 Product Manual, Rev. B iii

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Quick specification chart . . . . . . . . . . . . . . . . . . . . . . 3

1.0 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 Formatted capacity . . . . . . . . . . . . . . . . . . . . . . 5

1.1.1 Standard configuration . . . . . . . . . . . . . . . . . . 5

1.2 Physical organization . . . . . . . . . . . . . . . . . . . . . 6

1.3 Functional specifications . . . . . . . . . . . . . . . . . . . 6

1.4 Physical dimensions . . . . . . . . . . . . . . . . . . . . . . 7

1.5 Seek time . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.6 Multisegmented cache buffer . . . . . . . . . . . . . . . . . 7

1.7 Start and stop times . . . . . . . . . . . . . . . . . . . . . . 8

1.8 Typical power-up and power-down sequence . . . . . . . . . 8

1.9 Power-up sequence . . . . . . . . . . . . . . . . . . . . . 9

1.9.1 Power-down sequence . . . . . . . . . . . . . . . . . . 9

1.10 Auto-park . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.11 Power specifications . . . . . . . . . . . . . . . . . . . . . 9

1.11.1 Power management . . . . . . . . . . . . . . . . . . . 9

1.11.2 Power consumption . . . . . . . . . . . . . . . . . 11

1.12 Input noise . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.13 Environmental specifications . . . . . . . . . . . . . . . . 11

1.13.1 Ambient temperature . . . . . . . . . . . . . . . . . 11

1.13.2 Temperature gradient . . . . . . . . . . . . . . . . . 12

1.13.3 Altitude . . . . . . . . . . . . . . . . . . . . . . . . 12

1.13.4 Relative humidity . . . . . . . . . . . . . . . . . . . 12

1.14 Shock and vibration . . . . . . . . . . . . . . . . . . . . 12

1.15 Acoustics . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.16 Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1.17 Agency listings . . . . . . . . . . . . . . . . . . . . . . . 13

1.18 Electromagnetic Compliance for the European Union . . . 14

iv Medalist Pro 6450/6451 Product Manual, Rev. B

1.19 FCC verification . . . . . . . . . . . . . . . . . . . . . . 14

2.0 Configuring and mounting the drive . . . . . . . . . . . . . 17

2.1 Handling and static-discharge precautions . . . . . . . . . 17

2.2 I/O cable and connector. . . . . . . . . . . . . . . . . . . 18

2.3 Power connector . . . . . . . . . . . . . . . . . . . . . . . 18

2.4 Options jumper block . . . . . . . . . . . . . . . . . . . . 19

2.4.1 Master/slave configuration . . . . . . . . . . . . . . 20

2.4.2 Alternate capacity jumper . . . . . . . . . . . . . . . . 21

2.4.3 Cable-select option . . . . . . . . . . . . . . . . . . . 21

2.4.4 Remote LED connection . . . . . . . . . . . . . . . . 21

2.5 Mounting the drive . . . . . . . . . . . . . . . . . . . . . . 22

3.0 ATA interface . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.1 ATA Interface connector pin assignments . . . . . . . . . . 25

3.2 Command set . . . . . . . . . . . . . . . . . . . . . . . . 27

3.2.1 Identify drive command (EC

3.2.2 Set Features command (EF

. . . . . . . . . . . . . 29

H)

) . . . . . . . . . . . . . 32

H

3.2.3 Standby timer timeout period . . . . . . . . . . . . . . 34

3.2.4 Sleep command (99

, E6H) . . . . . . . . . . . . . . 34

H

3.2.5 Automatic Reallocation . . . . . . . . . . . . . . . . . 34

3.3 Synchronous DMA Transfer . . . . . . . . . . . . . . . . . 35

3.3.1 Signal Line Definitions . . . . . . . . . . . . . . . . . . . 35

3.3.2 Protocol Rules . . . . . . . . . . . . . . . . . . . . . 35

3.3.3 Error Register . . . . . . . . . . . . . . . . . . . . . . 36

Appendix. Timing diagrams . . . . . . . . . . . . . . . . . . 37

Medalist Pro 6450/6451 Product Manual, Rev. B v

Figures

Figure 1. Typ i cal startup cur rent profile . . . . . . . . . . . . . . . . 8

Figure 2. ATA interface connector . . . . . . . . . . . . . . . . . 18

Figure 3. Connectors . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 4. Configuration settings . . . . . . . . . . . . . . . . . . . 20

Figure 5. Connecting cable-selected drives . . . . . . . . . . . . . 22

Figure 6. Mounting dimensions . . . . . . . . . . . . . . . . . . . 23

Figure 7. ATA interface connector pin assignments . . . . . . . . 26

Figure 8. Programmed I/O timing without IORDY . . . . . . . . . . 37

Figure 9. Programmed I/O timing with IORDY . . . . . . . . . . . 38

Figure 10. Multiword DMA timing . . . . . . . . . . . . . . . . . . 39

Figure 11. Sustained synchronous DMA burst . . . . . . . . . . . 40

vi Medalist Pro 6450/6451 Product Manual, Rev. B

Medalist Pro 6450/6451 Product Manual, Rev. B 1

Introduction

This manual describes the functional, mechanical and interface specifi­cations for the Medalist

®

Pro 6450 and the Medalist Pro 6451 hard disc
drives. The drives are referred to throughout this manual by their model
numbers, ST36450A for the Medalist Pro 6450 and ST36451A for the
Medalist Pro 6451.

Seagate

®

desktop products take a step into the future with the ST36450A
and ST36451A. These drives feature MR heads and PRML recording
technology, Fast ATA-2 and Ultra ATA performance, segmented cache,
embedded servo technology, low noise and power management

The ST36450A and the S T36451A each c ontain five discs. These dr ives
use MR heads and PRML technology that provide the drives with
increased areal density. This means that more data can be stored on
each disc.

The ST36450A supports Fast ATA-2 technology and provides burst
transfer rates of up to 16.6 Mbytes per second. The ST36451A supports
Ultra ATA technology and provides burst-transfer r ates of up to 33.3
Mbytes per second. Both drives support PIO mode 4, multiword DMA
mode 2 transfer modes and multiple block read/write. The multiple block
read/write feature allows the drives to store several blocks of data in
cache and to transfer them in a single burst.

These drives use a 512-Kbyte segmented cache. Segmenting the cache
provides a designated area where blocks of contiguous read or write data
can be staged for transfer in a single burst.

The ST36450A and ST36451A drives hav e other features that ensure
fast data throughput. Embedded servo technology allows the drives to
position the heads for data retrieval efficiently and accurately while
eliminating the periodic thermal recalibration t hat can interrupt during
data transfers. These drives also use a 16-bit microprocessor and an
intelligent controller t hat provides data streaming: direct data transfers
between the drive and the host without microprocessor intervention.
These features allow for a sus tained data-transfer rate that facilitates
video-playback and other multimedia operations.

These drives support Active, Idle and Standby power-management
modes. Power-saving modes can be controlled by the computer.
Standby mode reduces power consumption to 2 watts (typical) while
retaining drive accessibility.

2 Medalist Pro 6450/6451 Product Manual, Rev. B

The ATA commands with specific applications for these drives and the
Seagate-unique commands the drives use are discussed in Section 3.0
on page 25. A complete list of the commands the drives support are found
in the table on page 27.

The following is a summary of the drives’ features:

Capacity

• 6.4 Gbytes formatted

• LBA translation support

• Av ailable software driver that surpasses the 528-Mbyte barrier and

4,096 cylinder barrier limited by some system BIOSs

• Av ailable software driver that provides expanded 32-bit disk access
support for Windows 3.

Performance

• Fast ATA -2 (ST36450A) —burst transfer rates up to 16.6-Mbytes-per­second

• Ult ra ATA (ST36451A)—burst transfer rates up to 13.3-Mbytes-per­second

• Supports DMA mode 2, PIO mode 4 and multiple block read/write.

x

• 512-K byte segmented buffer

• 12-msec average read seek time

• 13. 5-msec average write seek time

• Data streaming

Energy-efficiency

• Activ e, Idle and Standby power-management modes

• 2 watt typical power dissipation rating in Standby mode

Medalist Pro 6450/6451 Product Manual, Rev. B 3

Quick specification chart

The following table serves as a quick reference for the drives’ perform­ance specifications. These and other specifications are discussed in
“Specifications” on page 5.

Drive specification

9

Guaranteed capacity (Gbytes) (x10
Guaranteed sectors 12,594,960 12,594,960
Bytes per sector 512 512
Sectors per track 63 63
Logical read/write heads 15 15
Logical cylinders 13,328 13,328
Physical cylinders 6,536 6,536
Physical read/write heads 10 10
Physical discs 5 5
Areal density (Mbits per square inch) 928.8 928.8
Data zones 19 19
Recording density (bits per inch) 138,011 138,011
Track density (tracks per inch) 6,730 6,730
Spindle speed (RPM) 5,397 5,397
Track-to-track se ek time (msec typical) 2.0 2.0
Average read seek time (msec typical) 9.5 9.5

bytes) 6.4 6.4

ST36450A ST36451A

Average write seek time (msec typical) 10.0 10.0
Full-stroke seek time (msec typical) 20 20
Average latency (msec) 5.58 5.58
Internal data-transfer rate

(Mbits per sec max) 63 to 116 63 to 116
External transfer rate (Mbytes per sec max) 16.6 33.3
Cache buffer (Kbytes) 512 512
ECC on-the-fly (bits) 65 65

continued

4 Medalist Pro 6450/6451 Product Manual, Rev. B

continued from previous page

Drive specification

ST36450A ST36451A

Height (inches max) 1.027 1.027
Width (inches max) 4.023 4.023
Depth (inches max) 5.787 5. 787
Typical weight (lb) 1.5 1.5
Spinup current (max) 3.0A 3.0A
Seek power (typical) 9.8W 9.8W
Read/Write power and current (typical) 7.8W 7.8W
Idle total power (typical) 7. 8W 7.8W
Standby/Sleep total power (typical) 2.0W 2.0W
Voltage tolerance (including noise): +5V ± 5% ± 5%
Voltage tolerance (including noise): +12V ± 5% ± 5%
Operating temperature (°C) 5 to 55°C 5 to 55°C

Medalist Pro 6450/6451 Product Manual, Rev. B 5

1.0 Specifications

1.1 Formatted capacity

Medalist Pro drives are low-level formatted at the factory. You cannot
low-level format them.

These drives support cylinder-head-sector (CHS) and logical-bloc k ad­dressing (LBA) translation modes. You can use the Identify drive (EC
command to verify the address modes the drives support, the number of
cylinders, secto rs per track, total num ber of sectors, h eads and other p arame­ters. The Identif y drive paramet ers are listed in Sec tion 3.2.1 on pag e 29.

.

Notes:

DOS cannot access more than 2.147 Gbytes per partition.You

1.

must create multiple partitions to access the drive’s full capacity.

One Mbyte equals one million bytes.

2.

If the system BIOS does not support more than 4,096 cylinders,

3.

it can cause the computer to hang during startup, or it can
truncate or wrap the cylinders. To resolve this issue, the system
BIOS needs to be modified: the cylinder register or variable must
be increased from 12-bits to 16-bits to accommodate more than
4,096 cylinders.

H

)

1.1.1 Standard configuration

ST36450A CHS LBA

Cylinders 13,328 
Heads 15 
Sectors 63 
Guaranteed sectors 12,594,960 12,594,960
Guaranteed capacity (Gbytes) 6.4 6.4

ST36451A CHS LBA

Cylinders 13,328 
Heads 15 
Sectors 63 
Guaranteed sectors 12,594,960 12,594,960
Guaranteed capacity (Gbytes) 6.4 6.4

6 Medalist Pro 6450/6451 Product Manual, Rev. B

1.2 Physical organization

ST36450A ST36451A

Read/write heads 10 10
Discs 5 5

1.3 Functional specifications

ST36450A ST36451A

Interface ATA-2 Ultra ATA
Recording method PRML (8/9 ) PRML (8/9)
External data burst transfer rate:

PIO mode 4 (Mbytes per sec)
DMA mode 2 (Mbytes per sec)
Synchronous DMA mode 2

Internal data-transfer rate
(Mbits per sec)

Spindle speed (RPM) 5,397 ± 0.5% 5,397 ± 0.5%
Cache size (Kbytes) 512 512
Logical cylinders 13,328 13,328
Physical cylinders 6,536 6,536
Bytes per sector 512 512
Areal density (Mbytes/sq. in) 928.8 928.8
Data zones 19 19
Recording density, max (BPI) 138,011 138,011
Track density (TPI) 6,730 6,730

16.6

16.6
––

63 to 116 63 to 116

16.6

16.6

33.3

See Figure 8 on page 37 and Figure 9 on page 38 for PIO timing

Note.

specifications. See Figure 10 on page 39 and Figure 11 on page
40 for DMA timing specifications

.

Medalist Pro 6450/6451 Product Manual, Rev. B 7

1.4 Physical dimensions

The mounting dimensions are shown in Figure 6 on page 23.
Height, max 1.027 inch (26.09 mm)

Width, max 4.025 inches (102.2 mm)
Depth, max 5.787 inches (146.99 mm)
Weight 1.5 lb (0.68 Kg)

1.5 Seek time

Seek value is the interval between the time the actuator begins to move
and the time the head has settled over the target track. Seek time is a
true statistical average of at least 10,000 measurements of seek time.
All measurements are taken under nominal conditions of temperature
and voltage with the drive mounted horizontally. The specifications in the
table below are defined as follows:

• Track -to-track seek time is the average of all possible s ingle-track
seeks in both directions.

• Average seek time is measured by executing seeks in both directions
between random cylinders.

• Ful l-stroke seek time is half the time needed to seek from track 0 to
the maximum track and back to track 0.

Track-to-track
seek time (typ)

2.0 msec seek

2.5 msec read

3.5 msec write
Host overhead varies between systems and cannot be specified.

Note.

Drive internal overhead is measured by issuing a no-motion seek.
Overhead is typically less than 0.5 msec.

Average/typical
seek time

9.5 msec read

10.0 msec write

Full-stroke
seek time (typ)

20.0 msec seek

22.0 msec read

23.5 msec write

Average
latency

5.58 msec

1.6 Multisegmented cache buffer

The Medalist Pro ST36450A and ST36451A drives are available with a
512-Kbyte, multisegmented cache buffer that improves performance by
reducing access times.

Read look-ahead.

logical sectors, after the last requested sector, into a buffer befor e the
computer requests the additional sectors. The c ache buffer stor es data

The drive uses the read segments to store additional

8 Medalist Pro 6450/6451 Product Manual, Rev. B

from the start of a read until the buffer segment is full or until another
command is received.

Write immediate.

The drive uses the write segment to store write
commands and data. After the drive receives all of the data for the
command, it issues a write complete. Then, the drive writes the data to
the disc.

Write merging.

The drive accepts contiguous write commands and

executes them as one command.

1.7 Start and stop times

Within 20 seconds after power is applied, the drive is ready. Within 15
seconds after power is removed, the drive spindle stops rotating.

1.8 Typical power-up and power-down sequence

This section describes typical power-up and power-down sequences to
assist you in evaluating the dri ve’s performance. They are not perform­ance specifications. A typical startup current profile is shown in Figure 1.
Startup current profiles are unique for each drive.

Current (Amps)

3.5

3.0

2.5

2.0

1.5

1.0

0

0



Figure 1. Typical startup current p rofi l e

4

2

6

8

10

Time (seconds)

12

14

16

18