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
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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 ULTRASTAR X P (DFHC) SSA M O D E L S 1.12/2.25 GB - 1.0" H I G H
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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 |
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1.12/2.25 GB - 1.0" H I G H |
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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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
Source filename=DESCRIP |
IBM Corporation |
Page 9 of 87 |
USER RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS
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
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.
Page 10 of 87 |
IBM Corporation |
Source filename=DESCRIP
USER RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS
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
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).
Source filename=SPECS |
IBM Corporation |
Page 11 of 87 |
USER RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS
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
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.) |
|
|
|
Page 12 of 87 |
IBM Corporation |
Source filename=SPECS
USER RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS
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
|
|
|
|
|
|
|
|
|
|
|
Notch # |
|
|
|
|
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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|
|
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).
Source filename=SPECS |
IBM Corporation |
Page 13 of 87 |
USER RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS
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
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)
Page 14 of 87 |
IBM Corporation |
Source filename=SPECS
USER RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS
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
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 |
|||
|
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|
|
0.28 |
Amps |
|
0.02 Amps |
|
|
|
|
|
|
|
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|
|
1 op/sec |
0.0027 Amps |
|
0.002 Amps |
|
|
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|
|
|
|
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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Page 21 of 87 |
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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
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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Page 23 of 87 |
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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
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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Page 27 of 87 |