IBM C1C 1.12, C4C 4.51, C1B 1.12, C4B 4.51, SSA, C2B 2.25, C2B 2.25 Brick On Sled carrier 128-pin HPC User Manual

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OEM FUNCTIONAL SPECIFICATION ULTRASTAR XP (DFHC) SSA MODELS 1.12/2.25 GB - 1.0" HIGH 4.51 GB - 1.6" HIGH

3.5 FORM FACTOR DISK DRIVE VERSION 5.0

August 15, 1995

Publication number 3304

IBM Corporation

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O E M F U N C T I O N AL SPECIFICATION ULTRASTAR XP (DFHC) SSA M O D E LS 1.12/2.25 GB - 1.0" H I G H

This document is preliminary and the contents are subject to change without notice. Equiries, suggestions, and requests for additional copies may be directed to:

O E M Engineering

IBM Corporation

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San Jose, CA 95193 (USA)

IBM may use any information that you supply without incurring any obligation.

IBM may have patents or pending patent applications covering subject matter in this document. The furnishing of this document does not give you any license to these patents. You can send license inquiries, in writing, to:

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A r m o n k NY 10577 USA

ãCopyright International Business Machines Corporation 1994. All rights reserved.

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O E M F U N C T I O N A L SPECIFICATION ULTRASTAR X P (DFHC) SSA M O D E L S 1.12/2.25 GB - 1.0" H I G H

Preface

This document details the product hardware specification for the Ultrastar XP SSA family of Direct Access Storage Devices. The capacity model offerings are 1.12, 2.25, and 4.51 GBytes (see 2.1.1, “Capacity Equations” onpage 13 for exact capacities based on model and block size). The form factor offerings are 'Brick On Sled'carrier and 3.5-inch small form factor (refer to 4.1.1, “Weight and Dimensions” onpage 51 for exact dimensions).

This document, in conjunction with the Ultrastar XP ( D F H C ) S S A Models Interface Specification, make up the Functional Specification for the Ultrastar X P SSA (DFHC) product.

The product description and other data found in this document represent IBM's design objectives and is provided for information and comparative purposes. Actual results may vary based on a variety of factors and the information herein is subject to change. THIS P R O D U C T DATA DOES N O T C O N S T I T U T E A WARRANTY, EXPRESS O R IMPLIED. Questions regarding IBM's warranty terms or the methodology used to derive the data should be referred to your IBM customer representative.

Note: Not all models described in this document are in plan. Contact your IBM customer representative for actual product plans.

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O E M F U N C T I O N A L SPECIFICATION
Contents

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ULTRASTAR X P (DFHC) SSA M O D E L S 1.12/2.25 GB - 1.0" H I G H

1.0

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9

1.1

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9

1.1.1General Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.1.2Performance Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.1.3Interface Controller Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.1.4Reliability Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1.2

Models

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

10

2.0

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11

2.1

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11

2.1.1Capacity Equations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.2Power Requirements by Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.2.1

C1x Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

15

2.2.2

C2x Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

21

2.2.3

C4x Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

27

2.2.4

CxB Models

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

33

2.2.5

Power Supply Ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

34

2.2.6

Grounding Requirements of the Disk Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . .

34

2.2.7

Hot plug/unplug support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

34

2.2.8

Bring-up Sequence (and Stop) Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

36

3.0 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

39

3.1Environment Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.2Workload Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

3.2.1Sequential

3.2.2Random

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

40

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

40

3.3Command Execution Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.3.1Basic Component Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

3.3.2

Comments

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

42

3.4 Approximating Performance for Different Environments . . . . . . . . . . . . . . . . . . . . . . . . .

43

3.4.1

For Different Transfer Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

44

3.4.2When Read Caching is Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

3.4.3When Write Caching is Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

3.4.4When Adaptive Caching is Enabled . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

3.4.5When Read-ahead is Enabled

3.4.6When N o Seek is Required

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

44

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

45

3.4.7For Queued Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

3.4.8Out of Order Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

3.5 Skew

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

3.5.1Cylinder to Cylinder Skew . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

3.5.2Track to Track Skew . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

3.6Idle Time Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

3.6.1 Servo R u n Out Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

3.6.2Servo Bias Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

3.6.3Predictive Failure Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

3.6.4Channel Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

3.6.5Save Logs and Pointers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

3.6.6

Disk Sweep . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

49

3.6.7

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

49

3.7 Command Timeout Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

49

IBM Corporation

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6.12 Connector Insertion Cycles
6.10 Periodic Maintenance

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4.0 Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . 51

4.1Small Form Factor Models (CxC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

4.1.1Weight and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

4.1.2

Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

51

4.1.3

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

51

4.1.4Unitized Connector Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

4.2Carrier Models (CxB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

4.2.1Weight and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

4.2.2

Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

57

4.2.3

Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

57

4.2.4Auto-docking Assembly Side Rails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

4.2.5Electrical Connector and Indicator Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

5.0 Electrical Interface

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

5.1SSA Unitized Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

5.2Carrier Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

5.3 SSA Link Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

5.4SSA Link Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

5.5Option Pins and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

5.5.1

- Manufacturing Test Mode (Option Port Pin 1)

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

66

5.5.2

- Auto Start Pin (Option Port Pin 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

66

5.5.3

- Sync Pin (Option Port Pin 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

66

5.5.4- Write Protect (Option Port Pin 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

5.5.5- Ground long (Option Port Pin 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

5.5.6

- Device Activity Pin/Indicator (Option Port Pin 6) . . . . . . . . . . . . . . . . . . . . . . . . .

67

5.5.7

+ 5V (Option Port Pin 7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

67

5.5.8

- Device Fault Pin/Indicator (Option Port Pin 8) . . . . . . . . . . . . . . . . . . . . . . . . . .

67

5.5.9Programmable pin 1 (Option Port Pin 9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

5.5.10Programmable pin 2 (Option Port Pin 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

5.5.11

- Early Power Off Warning or Power Fail (Power Port Pin 11) . . . . . . . . . . . . . . . . .

68

5.5.12

12V Charge and 5V Charge (Power Port pin 1 and 2) . . . . . . . . . . . . . . . . . . . . . . .

68

5.6Front Jumper Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

5.7Spindle Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

5.7.1Synchronization overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

5.7.2Synchronization Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

5.7.3Synchronization time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

5.7.4Synchronization with Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

5.7.5Synchronization Route . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

6.0

Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

73

6.1

Error Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

73

6.2

Data Reliability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

73

6.3

Seek Error Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

73

6.4

Power On Hours Examples: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

73

6.5

Power on/off cycles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

74

6.6

Useful Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

74

6.7*Mean Time Between Failure (*MTBF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

6.7.1Sample Failure Rate Projections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

6.8SPQL (Shipped product quality level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

6.9 Install Defect Free

6.11 ESD Protection

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

75

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

76

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

76

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

76

7.0 Operating Limits

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

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1.12/2.25 GB - 1.0" H I G H

7.1 Environmental . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . 77

7.1.1Temperature Measurement Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

7.2Vibration and Shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

7.2.1Drive Mounting Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

7.2.2Output Vibration Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

7.2.3Operating Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

7.2.4Operating Shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

7.2.5Nonoperating Shock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

7.3

Contaminants

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

82

7.4

Acoustic Levels

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

83

8.0

Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

85

8.1

Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

85

8.2

Electromagnetic Compatibility (EMC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

85

Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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1.0Description

1.1Features

1.1.1 General Features

1.12/2.25/4.51 gigabytes formatted capacity (512 bytes/sector) Serial Storage Architecture (SSA) attachment (dual port) Brick On Sled carrier and 3.5" small form factor models Rotary voice coil motor actuator

Closed-loop digital actuator servo (embedded sector servo) Magnetoresistive (MR) heads

(0,8,6,infinity) 8/9 rate encoding

Partial Response Maximum Likelihood (PRML) data channel with digital filter All mounting orientations supported

Jumperable auto spindle motor start Jumperable write protection Spindle synchronization

Two L E D drivers Bezel (optional)

1.1.2 Performance Summary

Average read seek time (1.12 GB): 6.9 milliseconds

Average read seek time (2.25 GB): 7.5 milliseconds

Average read seek time (4.51GB): 8.0 milliseconds

Average Latency: 4.17 milliseconds

Split read/write control

Media data transfer rate: 9.59 to 12.58 MegaBytes/second (10 bands)

SSA data transfer rate: 20 Megabytes/second

1.1.3 Interface Controller Features

Multiple initiator support

Supports blocksizes from 256 to 5952 bytes

512K byte, multi-segmented, dual port data buffer Read-ahead caching

Adaptive caching algorithms

Write Cache supported (write back & write thru) Tagged command queuing

Command reordering

Back-to-back writes (merged writes) Split reads and writes

Nearly contiguous read/write Link error recovery procedure exit Disable registration

Duplicate tags

Two byte U L P message codes SCSI response

Move data transfer messages Multiple ULP's

Automatic retry and data correction on read errors

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Automatic sector reallocation

In-line alternate sector assignment for high-performance

Improved technique for down-loadable SSA firmware

1.1.4 Reliability Features

Self-diagnostics on power up Dedicated head landing zone Automatic actuator latch

Embedded Sector Servo for improving on-track positioning capability Buffer memory parity

Longitudinal Redundancy Check (LRC) on Customer Data ECC on the fly

Error logging and analysis

Data Recovery Procedures (DRP) Predictive Failure Analysis ä (PFA &tm) N o preventative maintenance required

Two Field Replaceable Units (FRU's): Electronics Card and Head Disk Assembly (HDA) Probability of not recovering data: 10 in 1015 bits read

1.2 Models

The Ultrastar XP SSA disk drive is available in various models as shown below.

The Ultrastar XP SSA data storage capacities vary as a function of model and user block size. The emerging industry trend is capacity points in multiples of 1.08GB (i.e. 1.08/2.16/4.32) at a block size of 512 bytes. Future IBM products will plan to provide capacities that are consistent with this trend. Users that choose to make full use of the Ultrastar XP SSA drive capacity above the standard capacity points may not find equivalent capacity breakpoints in future products.

Model #

Capacity G B (@512 Byte)

Form Factor

Connector Type

 

 

 

 

C1B

1.12

Brick On Sled Carrier

128-pin H P C

 

 

 

 

C1C

1.12

3.5-inch Small F F

38-pin Unitized

 

 

 

 

C2B

2.25

Brick On Sled carrier

128-pin H P C

 

 

 

 

C2C

2.25

3.5-inch Small F F

38-pin Unitized

 

 

 

 

C4B

4.51

Brick On Sled carrier

128-pin H P C

 

 

 

 

C4C

4.51

3.5-inch Small F F

38-pin Unitized

 

 

 

 

Note: CxB models (C1B, C2B, and C4B) include a D C / D C converter, activity and check indicators.

Note: Please refer to section 2.1.1, “Capacity Equations” onpage 13 for exact capacities based on user block size.

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2.0 Specifications

All specifications are nominal values unless otherwise noted.

The Ultrastar XP SSA data storage capacities vary as a function of model and user block size. The emerging Industry trend is capacity points in 1.08GB (i.e. 1.08/2.16/4.32) at a block size of 512 bytes. This and future products will always plan to provide capacities that are consistent with this trend. Users that choose to make full use of the Ultrastar XP SSA drive capacity above the standard capacity points may not find equivalent capacity breakpoints in future products.

2.1 General

Note: The recording band located nearest the disk outer diameter (OD) is referred to as 'Notch #1'.While the recording band located nearest the inner diameter (ID) is called 'Notch #10'. 'Average'values are weighted with respect to the number of LBAs per notch when the drive is formatted with 512 byte blocks.

Data transfer rates

 

 

 

 

 

 

Notch #1

Notch #10

Average

 

 

Buffer to/from media

 

 

 

 

 

12.58

9.59

12.07

 

MB/s (instantaneous)

Host to/from buffer

 

 

 

 

up to 20.0 MB/s (synchronous) (sustained)

Data Buffer Size (bytes)

512 K (See 3.0, “Performance” onpage

39 for user data capacity.)

Rotational speed (RPM)

7202.7

 

 

 

 

Average latency (milliseconds)

4.17

 

 

 

 

Track Density (TPI)

4352

 

 

 

 

 

Minimum

Maximum

 

 

 

Recording density (BPI)

 

 

 

 

 

96,567

124,970

 

 

 

Areal density (Megabits/square inch)

 

 

 

 

 

 

 

 

 

 

420.3

543.9

 

 

 

(model numbers - > )

 

 

 

 

 

C4x

C2x

C1x

 

 

Disks

 

 

 

 

 

8

4

2

 

 

User Data Heads (trk/cyl)

 

 

 

 

 

16

8

4

 

 

Seek times (in milliseconds)

 

 

 

 

 

 

 

 

 

 

Single cylinder (Read)

 

 

 

 

 

0.5

0.5

0.5

 

 

(Write)

 

 

 

 

 

2.0

2.0

2.0

 

 

Average (weighted) (Read)

 

 

 

 

 

8.0

7.5

6.9

 

 

(Write)

 

 

 

 

 

9.5

9.0

8.5

 

 

Full stroke (Read)

 

 

 

 

 

16.5

15.0

14.0

 

 

(Write)

 

 

 

 

 

18.0

16.5

15.5

 

 

 

 

 

 

 

 

Note: Times are typical for a drive population under nominal voltages and casting temperature of 25˚ C. Weighted seeks are seeks to the cylinders of random logical block addresses (LBAs).

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Total Cylinders (tcyl)

All models

C4x Models

C2x Models

C1x Models

& User Cylinders (ucyl)

tcyl

 

ucyl

ucyl

ucyl

Notch #1

 

 

 

 

 

1893

1879

1877

1872

 

Notch #2

956

955

955

955

 

Notch #3

49

 

48

48

48

 

Notch #4

310

309

309

309

 

Notch #5

349

348

348

348

 

Notch #6

116

115

115

115

 

Notch #7

214

213

213

213

 

Notch #8

190

189

189

189

 

Notch #9

131

130

130

130

 

Notch #10

208

206

206

206

 

Sum of all Notches

 

 

 

 

 

 

 

 

 

 

4416

4392

4390

4385

 

Spares Sectors/cylinder (spr/cyl)

 

 

 

 

 

C4x Models

C2x Models

C1x Models

 

 

Notch #1

 

 

 

 

 

 

40

 

20

10

 

 

Notch #2

40

 

20

10

 

 

Notch #3

38

 

19

10

 

 

Notch #4

37

 

19

9

 

 

Notch #5

36

 

18

9

 

 

Notch #6

34

 

17

9

 

 

Notch #7

33

 

17

8

 

 

Notch #8

32

 

16

8

 

 

Notch #9

31

 

16

8

 

 

Notch #10

30

 

15

7

 

 

Last cylinder extra spares (lcspr)

 

 

 

 

 

 

60

 

30

14

 

 

User bytes/sector (ub/sct)

 

 

 

 

 

 

256

- 744 (even number of bytes only)

 

 

Sectors/logical block (sct/lba)

1-8

 

 

 

 

 

 

The lowest sct/lba that satisfies the following rules is used...

 

1. Block Length is evenly divisible by a number 2-8.

 

2. Quotient of previous equation is evenly divisible by 2.

 

3. Quotient must be ³ 256 and £ 744.

 

 

User bytes/logical block (ub/lba)

256

- 5952 (See rules for determining sct/lba above for determining sup-

 

ported ub/lba values.)

 

 

 

Sectors/track (sct/trk)

(See Table 1 on page 13 or contact an IBM Customer Representative

 

for other block lengths.)

 

 

 

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Notch #

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

User bytes /

1

 

2

 

3

 

4

 

5

 

 

6

 

7

 

8

 

9

 

10

logical block

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

256

 

216

 

216

 

216

 

202

 

195

 

 

180

 

180

 

180

 

180

 

162

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

512

 

135

 

135

 

130

 

126

 

120

 

 

115

 

112

 

108

 

105

 

100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

520

 

128

 

128

 

128

 

123

 

115

 

 

112

 

108

 

105

 

102

 

99

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

522

 

128

 

128

 

128

 

122

 

115

 

 

112

 

108

 

105

 

102

 

90

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

524

 

128

 

128

 

128

 

120

 

115

 

 

112

 

108

 

105

 

102

 

90

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

528

 

128

 

128

 

126

 

120

 

112

 

 

112

 

108

 

105

 

101

 

90

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

600

 

115

 

115

 

115

 

110

 

102

 

 

101

 

97

 

90

 

90

 

90

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

688

 

102

 

102

 

102

 

98

 

90

 

 

90

 

90

 

90

 

81

 

78

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

744

 

96

 

96

 

96

 

90

 

90

 

 

90

 

81

 

78

 

77

 

73

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table

1. Gross sectors per track for several block lengths

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C4x Models

 

 

C2x Models

 

 

C1x Models

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

User bytes /

 

formatted

 

 

logical

 

formatted

 

logical

 

 

formatted

 

 

logical

logical block

 

capacity

 

 

blocks /

 

capacity

 

blocks /

 

 

capacity

 

 

blocks /

 

 

 

(bytes)

 

 

drive

 

(bytes)

 

drive

 

 

(bytes)

 

 

 

drive

 

 

 

 

 

 

 

 

 

 

 

 

 

 

256

 

3,654,540,800

14,275,550

1,826,312,448

 

 

7,134,033

912,135,680

 

 

3,563,030

 

 

 

 

 

 

 

 

 

 

 

 

 

 

512

 

4,512,701,440

8,813,870

2,255,098,368

 

 

4,404,489

1,126,337,536

 

 

2,199,878

 

 

 

 

 

 

 

 

 

 

 

 

 

 

520

 

4,375,536,880

8,414,494

2,186,554,760

 

 

4,204,913

1,092,119,600

 

 

2,100,230

 

 

 

 

 

 

 

 

 

 

 

 

 

 

522

 

4,374,300,492

8,379,886

2,185,931,898

 

 

4,187,609

1,091,803,716

 

 

2,091,578

 

 

 

 

 

 

 

 

 

 

 

 

 

 

524

 

4,385,878,952

8,369,998

2,191,716,460

 

 

4,182,665

1,094,691,544

 

 

2,089,106

 

 

 

 

 

 

 

 

 

 

 

 

 

 

528

 

4,408,629,984

8,349,678

2,203,082,640

 

 

4,172,505

1,100,365,728

 

 

2,084,026

 

 

 

 

 

 

 

 

 

 

 

 

 

 

600

 

4,512,402,000

7,520,670

2,254,925,400

 

 

3,758,209

1,126,282,800

 

 

1,877,138

 

 

 

 

 

 

 

 

 

 

 

 

 

 

688

 

4,604,578,976

6,692,702

2,300,969,904

 

 

3,344,433

1,149,310,880

 

 

1,670,510

 

 

 

 

 

 

 

 

 

 

 

 

 

 

744

 

4,675,830,192

6,284,718

2,336,559,528

 

 

3,140,537

1,167,099,408

 

 

1,568,682

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table

2. User capacity for several block lengths

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.1.1 Capacity Equations

2.1.1.1 For Each Notch

The next group of equations must be calculated separately for each notch.

ub/lba

user bytes/sector (ub/sct) =

sct/lba

user sectors/cyl (us/cyl) = (sct/trk)(trk/cyl) - spr/cyl

spares/notch (spr/nch) = (spr/cyl)(ucyl)

Note: Add lcspr to the equation above for the notch closest to the inner diameter (#10).

user sectors/notch (us/nch) = (us/cyl)(ucyl)

Note: Subtract lcspr from the equation above for the notch closest to the inner diameter (#10).

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2.1.1.2 For Entire Drive

10

spares/drive (spr/drv) = å spr/nch notch = 1

10

user sectors/drive (us/drv) = å us/nch notch = 1

[us/drv ]

logical blocks/drive (lba/drv) = I N T

sct/lba

user capacity (fcap) = (lba/drv)(ub/lba)

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2.2 Power Requirements by Model

2.2.1 C1x Models

The following voltage specifications apply at the drive power connector. There is no special power on/off sequencing required. The extra power needed for Brick On Sled models and the + 3 8 V power option are described in 2.2.4, “CxB Models” onpage 33.

Input Voltage

 

+ 5 Volts Supply

5V (± 5 % during run and spin-up)

+ 1 2 Volts Supply

12V (± 5 % during run) ( + 5 % / -7% during spin-up)

The following current values are the combination measured values of SCSI models and SSA Cx4 model. The differences between SCSI and SSA is + 5 V currents. Because of different interface electronics and speed, SSA electronics card requires more + 5 V current than SCSI. Read/Write Base Line is 290 ma higher. Idle Average is 500 ma higher. (290ma and 500ma differences were found by measuring SSA Cx4 model). SSA + 5 V current numbers are derived from SCSI + 5 V current numbers by adding 290ma and 500ma accordingly.

Power Supply Current

+5 V D C (power-up)

+5 V D C (idle avg)

+5 V D C (R/W baseline)

+5 V D C (R/W pulse)

+1 2 V D C (power-up)

+1 2 V D C (idle avg)

+1 2 V D C (seek avg)

+1 2 V D C (seek peak)

+1 2 V D C (spin-up)

Drive power

Avg idle power

Avg R/W power

 

Population

 

Population

Notes

Mean

 

Stand. Dev.

 

 

 

 

Minimum voltage slew rate =

4.5 V/sec

 

 

 

 

 

 

1.23

Amps

 

0.02 Amps

 

 

 

 

 

 

1.25

Amps1

 

0.05 Amps

Base-to-peak

.36 Amps

 

0.06 Amps

 

 

 

 

 

 

Minimum voltage slew rate =

7.4 V/sec

 

 

 

 

 

 

0.28

Amps

 

0.02 Amps

 

 

 

 

 

 

 

 

1 op/sec

0.0027 Amps

 

0.002 Amps

 

 

 

 

 

 

1.20

Amps2

 

0.02 Amps

 

 

 

 

3.0 sec max

1.5 Amps3

 

0.1 Amps

 

9.51 Watts

.35 Watts

 

 

 

30 ops/sec

10.58 Watts

.35 Watts

 

 

 

1 See Figure 1 on page 18 for a plot of how the read/write baseline and read/write pulse sum together.

2The idle average and seek peek should be added together to determine the total 12 volt peak current. See Figure 2 on page 19 for a typical buildup of these currents. Refer to examples on the following page to see how to combine these values.

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2.2.1.1 Power Calculation Examples

Note: The following formulas assume all system ops as a 1 block read or write transfer from a random cylinder while at nominal voltage condition.

Example 1. Calculate the mean 12 volt average current.

If we assume a case of 30 operations/second then to compute the sum of the 12 volt mean currents the following is done.

 

mean

 

+ 1 2 V D C (idle average)

0.28

amps

+ 1 2 V D C (seek average) 0.027 * 30 =

0.081

amps

T O T A L

0.361

amps

Example 2. Calculate the mean plus 3 sigma 12 volt average current.

To compute the sum Therefore the square operations/second.

of the

12 volt mean current's 1 sigma value assume all the distributions are normal.

root

of the sum of the squares calculation applies. Assume a case of 30

 

sigma

 

+ 1 2 V D C (idle average)

0.02

amps

+ 1 2 V D C (seek average) sqrt(30*((0.0002)**2))=

0.001

amps

T O T A L

sqrt((0.02)**2+(.001)**2))=0.02

amps

 

So the mean plus 3 sigma mean current is 0.361 + 3*0.02 = 0.42 amps

 

Example 3. Power Calculation.

 

 

Nominal idle drive power = (1.23 Amps * 5 Volts) +

(0.28 Amps * 12

Volts) = 9.51 Watts

Nominal R / W

drive power at 30 ops/sec = (1.25 Amps * 5 Volts) +

(0.361 Amps * 12 Volts) = 10.58

Watts

 

 

 

Mean plus 3 sigma drive power for 30 random R / W operations/second. Assume that the 5 volt and 12 volt distributions are independent therefore the square root of the sum of the squares applies.

+ 5 V D C (1 sigma power)

0.05 * 5

=

0.25

watts

+ 1 2 V D C (1 sigma power)

0.02 * 12

=

0.24

watts

Total (1 sigma power) sqrt((0.25)**2+(0.24)**2)

=

0.347 watts

Total power

9.13 +

3 * 0.347

=

10.2

watts

3The current at start is the total 12 volt current required (ie. the motor start current, module current and voice coil retract current). See Figure 3 on page 20 for typical 12 volt current during spindle motor start.

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Example 4. Calculate the 12 volt peak current.

To compute the sum of the 12 volt peak currents the following is done.

 

mean

+ 1 2 V D C (idle avg)

0.28

amps

+ 1 2 V D C (seek peak)

1.2

amps

T O T A L

1.48

amps

Example 5. Calculate the mean plus 3 sigma 12 volt peak current.

To compute the sum of the 12

volt peak current's 1 sigma value assume all distributions are normal. There-

fore the square root of the sum

of the squares calculation applies.

 

sigma

+ 1 2 V D C (idle avg)

0.02 amps

+ 1 2 V D C (seek peak)

0.02 amps

T O T A L sqrt((0.02)**2+(0.02)**2)=0.028 amps

So the mean plus 3 sigma peak current is 1.48 + 3*0.028 = 1.56 amps

Things to check when measuring 12 V supply current:

Null the current probe frequently. Be sure to let it warm up.

Adjust the power supply to 12.00 V at the drive terminals.

Use a proper window width, covering an integral number of spindle revolutions.

Measure values at 25 degree C casting temperature.

Get a reliable trigger for Seek Peak readings.

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Figure 1. 5 volt current during read/write operations — C1x Models

1.Read/write baseline voltage.

2.Read/write pulse. The width of the pulse is proportional to the number of consecutive blocks read or written. The 5 volt supply must be able to provide the required current during this event.

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Figure 2. Typical 12 volt current — C1x Models

1.Maximum slew rate is 7 amps/millisecond.

2.Maximum slew rate is 100 amps/millisecond.

3.Maximum slew rate is 7 amps/millisecond.

4.Maximum slew rate is 3 amps/millisecond.

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Figure 3. Typical 12 volt spin-up current — C1x Models

1.Maximum slew rate is 20 amps/millisecond.

2.Current drops off as motor comes up to speed.

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2.2.2 C2x Models

The following voltage specifications apply at the drive power connector. There is no special power on/off sequencing required. The extra power needed for Brick On Sled models and the + 3 8 V power option are described in 2.2.4, “CxB Models” onpage 33.

Input Voltage

 

+ 5 Volts Supply

5V (± 5 % during run and spin-up)

+ 1 2 Volts Supply

12V (± 5 % during run) ( + 5 % / -7% during spin-up)

The following current values are the combination measured values of SCSI models and SSA Cx4 model. The differences between SCSI and SSA is + 5 V currents. Because of different interface electronics and speed, SSA electronics card requires more + 5 V current than SCSI. Read/Write Base Line is 290 ma higher. Idle Average is 500 ma higher. (290ma and 500ma differences were found by measuring SSA Cx4 model). SSA + 5 V current numbers are derived from SCSI + 5 V current numbers by adding 290ma and 500ma accordingly.

Power Supply Current

+5 V D C (power-up)

+5 V D C (idle avg)

+5 V D C (R/W baseline)

+5 V D C (R/W pulse)

+1 2 V D C (power-up)

+1 2 V D C (idle avg)

+1 2 V D C (seek avg)

+1 2 V D C (seek peak)

+1 2 V D C (spin-up)

Drive power

Avg idle power

Avg R/W power

 

Population

 

Population

Notes

Mean

 

Stand. Dev.

 

 

 

 

Minimum voltage slew rate =

4.5 V/sec

 

 

 

 

 

 

1.23

Amps

 

0.02 Amps

 

 

 

 

 

 

1.25

Amps4

 

0.05 Amps

Base-to-peak

.36 Amps

 

0.06 Amps

 

 

 

 

 

 

Minimum voltage slew rate =

7.4 V/sec

 

 

 

 

 

 

0.41

Amps

 

0.02 Amps

 

 

 

 

 

 

 

 

1 op/sec

0.0031 Amps

 

0.0002 Amps

 

 

 

 

 

 

1.20

Amps5

 

0.02 Amps

4.2 sec max

1.5 Amps6

 

0.1 Amps

 

11.07 Watts

.35 Watts

 

 

 

30 ops/sec

12.25 Watts

.35 Watts

 

 

 

4 See Figure 4 on page 24 for a plot of how the read/write baseline and read/write pulse sum together.

5The idle average and seek peek should be added together to determine the total 12 volt peak current. See Figure 5 on page 25 for a typical buildup of these currents. Refer to examples on the following page to see how to combine these values.

6The current at start is the total 12 volt current required (ie. the motor start current, module current and voice coil retract current). See Figure 6 on page 26 for typical 12 volt current during spindle motor start.

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2.2.2.1 Power Calculation Examples

Note: The following formulas assume all system ops as a 1 block read or write transfer from a random cylinder while at nominal voltage condition.

Example 1. Calculate the mean 12 volt average current.

If we assume a case of 30 operations/second then to compute the sum of the 12 volt mean currents the following is done.

 

mean

 

+ 1 2 V D C (idle average)

0.41

amps

+ 1 2 V D C (seek average) 0.0031 * 30 =

0.09

amps

T O T A L

0.50

amps

Example 2. Calculate the mean plus 3 sigma 12 volt average current.

To compute the sum of the 12 volt mean current's 1 sigma value assume all the distributions are normal. Therefore the square root of the sum of the squares calculation applies. Assume a case of 30 operations/second.

 

 

sigma

 

+ 1 2 V D C (idle average)

0.02

amps

+ 1 2 V D C (seek average) sqrt(30*((0.0002)**2))=

0.001

amps

T O T A L

sqrt((0.02)**2+(.001)**2))=0.02

amps

 

So the mean plus 3 sigma mean current is 0.50 + 3*0.02 = 0.56 amps

Example 3. Power Calculation.

 

Nominal idle drive power = (1.23

Amps * 5 Volts) + (0.41 Amps * 12 Volts) = 11.07 Watts

Nominal R / W drive power at 30

ops/sec = (1.25 Amps * 5 Volts) + (0.50 Amps * 12 Volts) = 12.25

Watts

 

Mean plus 3 sigma drive power for 30 random R / W operations/second. Assume that the 5 volt and 12 volt distributions are independent therefore the square root of the sum of the squares applies.

+ 5 V D C (1 sigma power)

0.05 * 5

=

0.25 watts

+ 1 2 V D C (1 sigma power)

0.02 * 12

=

0.24

watts

Total (1 sigma power) sqrt((0.25)**2+(0.24)**2)

=

0.35 watts

Total power

10.8 +

3 * 0.35

=

11.9

watts

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Example 4. Calculate the 12 volt peak current.

To compute the sum of the 12 volt peak currents the following is done.

 

mean

 

+ 1 2 V D C (idle avg)

0.41

amps

+ 1 2 V D C (seek peak)

1.20

amps

T O T A L

1.61

amps

Example 5. Calculate the mean plus 3 sigma 12 volt peak current.

To compute the sum of the 12

volt peak current's 1 sigma value assume all distributions are normal. There-

fore the square root of the sum

of the squares calculation applies.

 

sigma

+ 1 2 V D C (idle avg)

0.03 amps

+ 1 2 V D C (seek peak)

0.02 amps

T O T A L sqrt((0.03)**2+(0.02)**2)=0.036 amps

So the mean plus 3 sigma peak current is 1.61 + 3*0.036= 1.72 amps

Things to check when measuring 12 V supply current:

Null the current probe frequently. Be sure to let it warm up.

Adjust the power supply to 12.00 V at the drive terminals.

Use a proper window width, covering an integral number of spindle revolutions.

Measure values at 25 degree C casting temperature.

Get a reliable trigger for Seek Peak readings.

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Figure 4. 5 volt current during read/write operations — C2x Models

1.Read/write baseline voltage.

2.Read/write pulse. The width of the pulse is proportional to the number of consecutive blocks read or written. The 5 volt supply must be able to provide the required current during this event.

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Figure 5. Typical 12 volt current — C2x Models

1.Maximum slew rate is 7 amps/millisecond.

2.Maximum slew rate is 100 amps/millisecond.

3.Maximum slew rate is 7 amps/millisecond.

4.Maximum slew rate is 3 amps/millisecond.

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Figure 6. Typical 12 volt spin-up current — C2x Models

1.Maximum slew rate is 20 amps/millisecond.

2.Current drops off as motor comes up to speed.

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2.2.3 C4x Models

The following voltage specifications apply at the drive power connector. There is no special power on/off sequencing required. The extra power needed for Brick On Sled models and the + 3 8 V power option are described in 2.2.4, “CxB Models” onpage 33.

Input Voltage

 

+ 5 Volts Supply

5V (± 5 % during run and spin-up)

+ 1 2 Volts Supply

12V (± 5 % during run) ( + 5 % / -7% during spin-up)

The following current values are the combination measured values of SCSI models and SSA Cx4 model. The differences between SCSI and SSA is + 5 V currents. Because of different interface electronics and speed, SSA electronics card requires more + 5 V current than SCSI. Read/Write Base Line is 290 ma higher. Idle Average is 500 ma higher. (290ma and 500ma differences were found by measuring SSA Cx4 model). SSA + 5 V current numbers are derived from SCSI + 5 V current numbers by adding 290ma and 500ma accordingly.

Power Supply Current

+5 V D C (power-up)

+5 V D C (idle avg)

+5 V D C (R/W baseline)

+5 V D C (R/W pulse)

+1 2 V D C (power-up)

+1 2 V D C (idle avg)

+1 2 V D C (seek avg)

+1 2 V D C (seek peak)

+1 2 V D C (spin-up)

Drive power

Avg idle power

Avg R/W power

 

Population

 

Population

Notes

Mean

 

Stand. Dev.

 

 

 

 

Minimum voltage slew rate =

4.5 V/sec

 

 

 

 

 

 

1.26

Amps

 

0.02 Amps

 

 

 

 

 

 

1.27

Amps7

 

0.05 Amps

Base-to-peak

.36

Amps

 

0.06 Amps

 

 

 

 

 

 

Minimum voltage slew rate =

7.4 V/sec

 

 

 

 

 

 

0.77

Amps

 

0.03 Amps

 

 

 

 

 

 

 

 

1 op/sec

0.0036 Amps

 

0.0002 Amps

 

 

 

 

 

 

1.3

Amps8

 

0.02 Amps

8.5 sec max

2.2

Amps9

 

0.1 Amps

 

15.54 Watts

.44 Watts

 

 

 

30 ops/sec

16.91 Watts

.44 Watts

 

 

 

7 See Figure 7 on page 30 for a plot of how the read/write baseline and read/write pulse sum together.

8The idle average and seek peek should be added together to determine the total 12 volt peak current. See Figure 8 on page 31 for a typical buildup of these currents. Refer to examples on the following page to see how to combine these values.

9The current at start is the total 12 volt current required (ie. the motor start current, module current and voice coil retract current). See Figure 9 on page 32 for typical 12 volt current during spindle motor start.

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