IBM Ultrastar 36LZX User manual

Hard disk drive specifications
Ultrastar 36LZX
3.5 inch SCSI hard disk drive
DDYS-T36950
DDYS-T18350
DDYS-T09170
Models:
Revision 2.1S31L-8989-05
IBM storage products - official published specifications

1st Edition (Rev. 1.0) S31L-8989-00 (December 8th, 1999)
2nd Edition (Rev. 1.1) S31L-8989-01 (January 21st, 2000)
3rd Edition (Rev. 1.2) S31L-8989-02(March 6th, 2000)
4th Edition (Rev. 1.3) S31L-8989-03 (March 15th, 2000)
5th Edition (Rev. 2.0) S31L-8989-04 (March 27th, 2000)
6th Edition (Rev. 2.1) S31L-8989-05 (June 9th, 2000)
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Table of contents
41
7.5.4 Power consumption efficiency index .............................................. 41
7.5.3 Ripple voltage ................................................................ 40
7.5.2 Power supply current .......................................................... 40
7.5.1 Input voltage ................................................................. 407.5 DC power requirements ............................................................. 397.4 Cooling requirements ............................................................... 38
7.3.1 Corrosion test ................................................................ 387.3 Environment ...................................................................... 36
7.2.2 Jumper signal description on J-4 ................................................ 34
7.2.1 Jumper signal description on J6 ................................................. 337.2 Option jumper block ................................................................ 32
7.1.7 Auxiliary connector on 68 pin model .............................................. 31
7.1.6 SCSI bus electrical characteristics ............................................... 31
7.1.5 Hot plug/unplug ............................................................... 31
7.1.4 SCSI bus terminator ........................................................... 31
7.1.3 SCSI cable .................................................................. 28
7.1.2 SCSI bus connector ........................................................... 27
7.1.1 Power connector ............................................................. 277.1 Electrical interface specification ...................................................... 27
7.0 Specification ..................................................................... 256.2 Reassigned format (G-List) .......................................................... 256.1 Shipped format (P-List) ............................................................. 25
6.0 Physical format ................................................................... 235.2 Error recovery procedure ............................................................ 235.1 Equipment status ................................................................... 23
5.0 Data integrity ..................................................................... 22
4.5.7 Throughput .................................................................. 21
4.5.6 Buffering operation (read ahead/write cache) ...................................... 21
4.5.5 Data transfer speed ........................................................... 20
4.5.4 Spindle stop time ............................................................. 20
4.5.3 Drive ready time .............................................................. 19
4.5.2 Mechanical positioning ......................................................... 18
4.5.1 Command overhead ........................................................... 184.5 Performance characteristics .......................................................... 174.4 Cylinder allocation ................................................................. 16
4.3.2 World Wide ID - Block assignment ............................................... 16
4.3.1 Product ID ................................................................... 164.3 Inquiry Information ................................................................. 154.2 Data sheet ........................................................................ 154.1 Formatted capacity ................................................................ 15
4.0 Drive characteristics .............................................................. 133.3 Actuator .......................................................................... 133.2 Head disk assembly ................................................................ 133.1 Control electronics ................................................................. 13
3.0 Fixed disk subsystem description .................................................. 11
2.0 Outline of the drive ............................................................... 101.3 General caution ................................................................... 101.2 Glossary ......................................................................... 91.1 Introduction ........................................................................ 9
1.0 General ...........................................................................
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93
8.8.1 Mode Parameter List .......................................................... 928.8 MODE SENSE (1A) ................................................................ 91
8.7.11 Log Sense Page 2F .......................................................... 88
8.7.10 Log Sense Page 10 .......................................................... 87
8.7.9 Log Sense Page F ............................................................ 86
8.7.8 Log Sense Page E ............................................................ 85
8.7.7 Log Sense Page D ............................................................ 84
8.7.6 Log Sense Page 6 ............................................................ 82
8.7.5 Log Sense Page 5 ............................................................ 80
8.7.4 Log Sense Page 3 ............................................................ 78
8.7.3 Log Sense Page 2 ............................................................ 77
8.7.2 Log Sense Page 0 ............................................................ 76
8.7.1 Log Page parameters .......................................................... 758.7 LOG SENSE (4D) ................................................................. 748.6 LOG SELECT (4C) ................................................................. 66
8.5.1 INQUIRY DATA .............................................................. 648.5 INQUIRY (12) ..................................................................... 61
8.4.2 Defect descriptor ............................................................. 60
8.4.1 Defect list .................................................................... 598.4 FORMAT UNIT (04) ................................................................ 588.3 Byte ordering conventions ........................................................... 588.2 Abbreviations ...................................................................... 588.1 SCSI Control Byte .................................................................. 57
8.0 SCSI Command Set ............................................................... 55
7.12.4 Flammability ................................................................ 55
7.12.3 German Safety Mark ......................................................... 55
7.12.2 IEC Compliance ............................................................. 55
7.12.1 UL and CSA standard conformity ............................................... 557.12 Safety .......................................................................... 54
7.11.2 C-Tick Mark ................................................................ 54
7.11.1 CE Mark ................................................................... 547.11 Electromagnetic compatibility ....................................................... 537.10 Identification labels ............................................................... 52
7.9.1 Sound power levels ........................................................... 527.9 Acoustics ......................................................................... 51
7.8.4 Non-operating shock .......................................................... 50
7.8.3 Operating shock .............................................................. 50
7.8.2 Non-operating vibrations ....................................................... 49
7.8.1 Operating vibration ............................................................ 497.8 Vibration and shock ................................................................ 48
7.7.6 Breather hole ................................................................ 48
7.7.5 Heads unload and actuator lock ................................................. 47
7.7.4 Mounting positions and tappings ................................................. 46
7.7.3 Interface connector ............................................................ 45
7.7.2 Mechanical dimensions ........................................................ 44
7.7.1 Outline ...................................................................... 447.7 Mechanical specifications ........................................................... 43
7.6.7 Temperature Warning ......................................................... 42
7.6.6 Preventive maintenance ....................................................... 42
7.6.5 Failure prediction (PFA/S.M.A.R.T.) .............................................. 42
7.6.4 Equipment errors ............................................................. 42
7.6.3 Seek/ID miscompare errors ..................................................... 427.6.2 Data reliability ................................................................ 427.6.1 Start/stop cycles .............................................................. 427.6 Reliability ........................................................................
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1648.29 RESERVE (16) .................................................................. 1638.28 REQUEST SENSE (03) ........................................................... 1628.27 REPORT LUN (A0) .............................................................. 1608.26 REPORT DEVICE IDENTIFIER (A3) ................................................ 1598.25 RELEASE (57) .................................................................. 1588.24 RELEASE (17) .................................................................. 157
8.23.3 Receive Diagnostic Page 80 .................................................. 156
8.23.2 Receive Diagnostic Page 40 .................................................. 155
8.23.1 Receive Diagnostic Page 0 ................................................... 1558.23 RECEIVE DIAGNOSTICS (1C) .................................................... 1538.22 REASSIGN BLOCKS (07) ......................................................... 1528.21 READ LONG (3E) ............................................................... 1518.20 READ EXTENDED (28) ........................................................... 150
8.19.3 Physical Sector Format (101b) ................................................ 149
8.19.2 Bytes from Index Format (100b) ............................................... 149
8.19.1 Defect List Header .......................................................... 1488.19 READ DEFECT DATA (B7) ....................................................... 147
8.18.3 Physical Sector Format (101b) ................................................ 146
8.18.2 Bytes from Index Format (100b) ............................................... 146
8.18.1 Defect List Header .......................................................... 1458.18 READ DEFECT DATA (37) ........................................................ 1438.17 READ CAPACITY (25) ........................................................... 142
8.16.5 Echo Buffer Descriptor (Mode 1011b) .......................................... 142
8.16.4 Read Data from Echo Buffer (Mode 1010b) ..................................... 141
8.16.3 Descriptor (Mode 0011b) ..................................................... 141
8.16.2 Read Data (Mode 0010b) .................................................... 141
8.16.1 Combined Header And Data (Mode 0000b) ...................................... 1408.16 READ BUFFER (3C) ............................................................. 1398.15 READ (08) ...................................................................... 1388.14 PRE-FETCH (34) ................................................................ 136
8.13.5 Summary .................................................................. 136
8.13.4 Parameter list .............................................................. 134
8.13.3 Type ..................................................................... 134
8.13.2 Scope .................................................................... 131
8.13.1 Service Action ............................................................. 1308.13 PERSISTENT RESERVE OUT (5F) ................................................ 128
8.12.3 Parameter data for Read Reservations ......................................... 128
8.12.2 Parameter data for Read Keys ................................................ 127
8.12.1 Service Action .............................................................. 1278.12 PERSISTENT RESERVE IN (5E) .................................................. 1268.11 MODE SELECT (55) ............................................................. 1248.10 MODE SELECT (15) ............................................................. 1238.9 MODE SENSE (5A) ............................................................... 121
8.8.13 Mode Page 1C (Informational Exceptions Control) ................................ 120
8.8.12 Mode Page 1A (Power Control) ............................................... 119
8.8.11 Mode Page 19 (Port Control) ................................................. 117
8.8.10 Mode Page 0C (Notch Parameters) ............................................ 115
8.8.9 Mode Page A (Control Mode Page Parameters) ................................... 112
8.8.8 Mode Page 8 (Caching Parameters) ............................................ 110
8.8.7 Mode Page 7 (Verify Error Recovery Parameters) ................................. 109
8.8.6 Mode Page 4 (Rigid Disk Drive Geometry Parameters) ............................. 107
8.8.5 Mode Page 3 (Format Device Parameters) ....................................... 105
8.8.4 Mode Page 2 (Disconnect/Reconnect Parameters) ................................. 100
8.8.3 Mode Page 1 (Read/Write Error Recovery Parameters) ............................ 978.8.2 Mode Page 0 (Vendor Unique Parameters) ........................................
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207
10.4.5 DATA OUT Phase Parity Error ................................................ 207
10.4.4 COMMAND Phase Parity Error ................................................ 207
10.4.3 MESSAGE IN Phase Parity Error (Message Parity Error) .......................... 207
10.4.2 MESSAGE OUT Phase Parity Error ............................................ 207
10.4.1 Unexpected BUS FREE Phase Error Condition .................................. 20710.4 SCSI Bus Related Error Handling Protocol ........................................... 20610.3 Attention Condition ............................................................... 20510.2 Supported Message Functions ..................................................... 204
10.1.20 IDENTIFY (80 - FF) ........................................................ 204
10.1.19 IGNORE WIDE RESIDUE (23h) .............................................. 203
10.1.18 QUEUE TAG MESSAGES (20h, 21h, 22h) ..................................... 202
10.1.17 CLEAR QUEUE TAG (0E) .................................................. 202
10.1.16 ABORT TAG (0D) ......................................................... 202
10.1.15 BUS DEVICE RESET (0C) .................................................. 202
10.1.14 LINKED COMMAND COMPLETE WITH FLAG (0B) ............................. 202
10.1.13 LINKED COMMAND COMPLETE (0A) ........................................ 201
10.1.12 MESSAGE PARITY ERROR (09) ............................................ 201
10.1.11 NO OPERATION (08) ...................................................... 201
10.1.10 MESSAGE REJECT (07) ................................................... 201
10.1.9 ABORT (06) ............................................................... 200
10.1.8 INITIATOR DETECTED ERROR (05) .......................................... 200
10.1.7 DISCONNECT (04) ......................................................... 20010.1.6 RESTORE POINTERS (03) .................................................. 20010.1.5 SAVE DATA POINTER (02) .................................................. 199
10.1.4 PARALLEL PROTOCOL REQUEST (01,06,04H) ................................. 197
10.1.3 WIDE DATA TRANSFER REQUEST (01,02,03H) ................................ 192
10.1.2 SYNCHRONOUS DATA TRANSFER REQUEST (01,03,01H) ...................... 192
10.1.1 COMMAND COMPLETE (00) ................................................. 19110.1 Supported Messages ............................................................. 191
10.0 SCSI Message System .......................................................... 189
9.0 SCSI Status Byte ................................................................ 1878.45 WRITE SAME (41) ............................................................... 1868.44 WRITE LONG (3F) .............................................................. 1858.43 WRITE EXTENDED (2A) ......................................................... 184
8.42.5 Write Data to Echo Buffer (Mode 1010b) ........................................ 183
8.42.4 Download Microcode and Save (Mode 0101b) ................................... 183
8.42.3 Download Microcode (Mode 0100b) ............................................ 182
8.42.2 Write Data (Mode 0010b) .................................................... 182
8.42.1 Combined Header And Data (Mode 0000b) ...................................... 1818.42 WRITE BUFFER (3B) ............................................................ 1808.41 WRITE AND VERIFY (2E) ........................................................ 1798.40 WRITE (0A) .................................................................... 1788.39 VERIFY (2F) .................................................................... 1778.38 TEST UNIT READY (00) .......................................................... 1768.37 SYNCHRONIZE CACHE (35) ...................................................... 1758.36 START/STOP Unit (1B) ........................................................... 1738.35 SET DEVICE IDENTIFIER (A4) .................................................... 172
8.34.3 Send Diagnostic Page 80 .................................................... 171
8.34.2 Send Diagnostic Page 40 .................................................... 171
8.34.1 Send Diagnostic Page 0 ..................................................... 1698.34 SEND DIAGNOSTIC (1D) ......................................................... 1688.33 SEEK EXTENDED (2B) ........................................................... 1678.32 SEEK (0B) ..................................................................... 1668.31 REZERO UNIT (01) .............................................................. 1658.30 RESERVE (56) ..................................................................
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235
12.2.5 Information Bytes (Byte 3 through 6) ........................................... 234
12.2.4 Sense Key (Bit 3 - 0 of byte 2) ................................................ 234
12.2.3 ILI: Incorrect Length Indicator (Bit 5 of byte 2) .................................... 234
12.2.2 Error Code (Bit 6 - 0 of byte 0) ................................................ 234
12.2.1 Valid (Bit 7 of byte 0) ........................................................ 23412.2 Sense Data Description ........................................................... 23312.1 SCSI Sense Data Format ......................................................... 233
12.0 SCSI Sense Data ............................................................... 23111.18 Idle Time Function .............................................................. 230
11.17.3 Diagnostics Fault Reporting ................................................. 230
11.17.2 Diagnostics Command ...................................................... 230
11.17.1 Power on Diagnostics ...................................................... 23011.17 Diagnostics .................................................................... 229
11.16.2 Reset Actions ............................................................. 229
11.16.1 Reset Sources ............................................................ 22911.16 Reset ......................................................................... 22811.15 Contingent Allegiance Condition ................................................... 228
11.14.3 Initiator Data Transfer Mode Parameter ........................................ 228
11.14.2 Initiator Mode Select/Mode Sense Parameters .................................. 228
11.14.1 Initiator Sense Data ........................................................ 22811.14 Multiple Initiator Environment ..................................................... 22811.13 Selection without ATN ........................................................... 22711.12 Non-arbitrating systems .......................................................... 22711.11 Single Initiator Selection ......................................................... 22711.10 Reselection Timeout ............................................................ 227
11.9.2 Read Ahead ............................................................... 227
11.9.1 Overview .................................................................. 22711.9 Segmented Caching ............................................................. 22511.8 Automatic Rewrite/Reallocate ...................................................... 22511.7 Write Cache .................................................................... 22411.6 Back to Back Write .............................................................. 22411.5 Concurrent I/O Process ........................................................... 22411.4 Command reordering ............................................................. 223
11.3.6 Device behavior on Command queuing ......................................... 223
11.3.5 Queue Full status ........................................................... 223
11.3.4 Command queuing rule ...................................................... 223
11.3.3 Untagged queuing .......................................................... 223
11.3.2 Tagged queuing ............................................................ 223
11.3.1 Queue depth ............................................................... 22211.3 Command queuing ............................................................... 22211.2 Priority commands ............................................................... 221
11.1.10 Command processing while reserved ......................................... 215
11.1.9 Degraded Mode ............................................................ 215
11.1.8 Deferred Error .............................................................. 214
11.1.7 Internal Error Condition ...................................................... 214
11.1.6 Command Processing During Startup and Format Operations ...................... 213
11.1.5 Unit Attention Condition ...................................................... 211
11.1.4 Command Processing during execution of active I/O process ....................... 210
11.1.3 Incorrect Initiator Connection .................................................. 210
11.1.2 Invalid LUN in Identify Message ............................................... 209
11.1.1 Priority of SCSI Status Byte Reporting .......................................... 20911.1 SCSI Protocol ................................................................... 209
11.0 Additional information .......................................................... 208
10.4.7 MESSAGE REJECT Message ................................................ 20810.4.6 INITIATOR DETECTED ERROR Message ......................................
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247
12.2.14 Reserved (Byte 30 through 31) .............................................. 247
12.2.13 Physical Error Record (Byte 24 thru 29) ....................................... 242
12.2.12 Vendor unique error information (Byte 20 through 23) ............................ 242
12.2.11 Reserved (Byte 18 through 19) .............................................. 240
12.2.10 Sense Key Specific (Byte 15 through 17) ...................................... 240
12.2.9 FRU : Field Replaceable Unit (Byte 14) ......................................... 236
12.2.8 Additional Sense Code/Qualifier (Byte 12 and 13) ................................ 235
12.2.7 Command Specific Information (Byte 8 through 11) ............................... 23512.2.6 Additional Sense Length (Byte 7) ..............................................
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1.0 General
1.1Introduction
This document describes the specifications of the following IBM 3.5 inch SCSI drives.
ŸDDYS-T36950
- Ultra 160,68 pin
- Ultra 160,80 pin
ŸDDYS-T18350
- Ultra 160,68 pin
- Ultra 160,80 pin
ŸDDYS-T09170
- Ultra 160,68 pin
- Ultra 160,80 pin
NOTE: The specifications in this document are subject to change without notice.
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1.2Glossary
Meaning
1,000 Bits Per Inch
1,000,000 Bits per second
1,000,000,000 bytes
1,000,000 bytes
1,000 bytes unless otherwise specified
1,000,000 bits per square inch
Machine Level Control
Predictive Failure Analysis (Trademark of IBM Corp.)
Self-Monitoring Analysis and Reporting Technology
Automatic Drive Maintenance
SCSI Configured Automatically
Single Ended SCSI
Low Voltage Differential SCSI
Fibre Channel - Arbitrated Loop
Word
Kbpi
Mbps
GB
MB
KB
Mb/sq.in
MLC
PFA
S.M.A.R.T.
ADM
SCAM
SE
LVD
FC-AL
1.3General caution
This drive can be damaged by ESD (Electric Static Discharge). Any damages incurred to
the drive after removing it from the shipping package and the ESD protective bag are the responsibility
of the user.
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2.0 Outline of the drive
ŸData capacity 36.7/18.3/9.1 GB
ŸUltra 160 (68/80 pin)
ŸInterleave factor 1:1
ŸVariable Sector Size (512-528 bytes/sector)
ŸTagged Command Queuing support
ŸAutomatic read/write data transfer
Ÿ4MB segmented sector buffer (128KBx28, 256KBx14 or 512KBx7)
Ÿ4.9 msec seek time in read operation
ŸAdaptive read ahead algorithm
ŸWrite Cache
ŸBack to back write
ŸECC on the fly
ŸAutomatic defect reallocation
ŸSelf diagnostics at power on
ŸClosed loop actuator servo
ŸHigh level of integration of the electronics
ŸNon head disk contact start stop
Ÿ10000rpm spindle rotation
ŸAutomatic actuator lock
ŸPFA (SMART)
ŸGlass substrate disks
NOTE: PFA (Predictive Failure Analysis) is a trademark of the IBM Corporation.
Ultrastar 36LZX hard disk drive specifications
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3.0 Fixed disk subsystem description
3.1Control electronics
The drive is electronically controlled by a microprocessor, logic modules, digital/analogue modules, and
various drivers and receivers. The control electronics perform the following major functions:
ŸPerform self-checkout (diagnostics).
ŸConduct a power-up sequence and calibrate the servo.
ŸMonitor various timers for head settling, servo failure, etc.
ŸAnalyze servo signals to provide closed loop control. These include position error signal and
estimated velocity.
ŸControl the voice coil motor driver to align the actuator onto a desired position.
ŸMonitor the actuator position and determine the target track for a seek operation.
ŸConstantly monitor error conditions of the servo and take corresponding action if an error occurs.
ŸControl starting, stopping, and rotating speed of the spindle.
ŸControl and interpret all interface signals between the host controller and the drive.
ŸControl read write accessing of the disk media, including defect management and error recovery.
3.2Head disk assembly
The head disk assembly (HDA) is assembled in a clean room environment and contains disks, a spindle
motor, actuator assembly, and voice coil motor. Air is constantly circulated and filtered when the drive is
operational. Venting of the HDA is accomplished via a breather filter.
The spindle is driven directly by a brushless, sensorless DC drive motor. Dynamic braking is used to stop
the spindle quickly.
3.3Actuator
The read/write heads are mounted in the actuator. The actuator is a swing-arm assembly driven by a
voice coil motor. A closed-loop positioning servo controls the movement of the actuator. An embedded
servo pattern supplies feedback to the positioning servo to keep the read/write heads centered over the
desired track.
The actuator assembly is balanced to allow vertical or horizontal mounting without adjustment.
When the drive is powered off, the actuator automatically moves the head to a load/unload zone
outside of the data area, where the actuator is locked.
Ultrastar 36LZX hard disk drive specifications
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Ultrastar 36LZX hard disk drive specifications
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4.0 Drive characteristics
4.1Formatted capacity
17,916,240
(1116150h)
35,843,670
(222EE56h)
71,687,340
(445DCACh)
Total logical data
blocks
9,173,114,88018,351,959,04036,703,918,080Total data bytes (512
bytes/sector)
236Number of disks 3612Number of heads 512 - 528512 - 528512 - 528Sectors per track 9.17 GB18.35 GB36.70 GBLabel capacity DDYS-T09170DDYS-T18350DDYS-T36950Description
Figure 1. Formatted capacity
4.2Data sheet
11Data zone 7040 (Max)Areal density [Mb/sq.in.] 20,000 (Average)Track density [TPI] 303 (Average) 352 (Max)Recording density [Kbpi]10,000Rotational speed [RPM] 7 x 512 KB or 14 x 256 KB or 28 x 128 KBNumber of buffer segments 4096 KB (512 KB used by firmware)Data buffer size
80 (68/80 pin FAST 40 WIDE)
160 (68/80 pin Ultra 160)
Host to/from buffer (interface transfer
rate) [Mbyte/sec]
280 - 452 MbpsBuffer to/from media [Mbit/sec]
Figure 2. Data sheet
NOTE: KB = 1,024 bytes
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4.3Inquiry Information
4.3.1Product ID
Product ID in Inquiry data format - CmdDt = 0 EVPD = 0 on Page 66 is as follows.
36.7 GB, 80 pinDDYS-T36950M36.7 GB, 68 pinDDYS-T36950N18.3 GB, 80 pinDDYS-T18350M18.3 GB, 68 pinDDYS-T18350N9.1 GB, 80 pinDDYS-T09170M9.1 GB, 68 pinDDYS-T09170NDescriptionProduct ID
Figure 3. Product ID in Inquiry Command
4.3.2World Wide ID - Block assignment
Block assignment of World Wide ID in Inquiry data format - EVPD = 1 - Page Code = 83h on Page 73 is as
follows.
707hDDYS-T36950 706hDDYS-T18350 705hDDYS-T09170
Singapore
507hDDYS-T36950 506hDDYS-T18350 505hDDYS-T09170
SPT, Thailand
207hDDYS-T36950 206hDDYS-T18350 205hDDYS-T09170
SFV, Hungary
107hDDYS-T36950 106hDDYS-T18350 105hDDYS-T09170
Saha Union, Thailand
007hDDYS-T36950 006hDDYS-T18350 005hDDYS-T09170
Fujisawa, Japan
Block assignmentProductManufacturing site
Figure 4. Block assignment of World Wide ID in Inquiry Command
Ultrastar 36LZX hard disk drive specifications
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4.4Cylinder allocation
30813715 - 15109Data Zone 10 33612000 - 13714Data Zone 9 35211196 - 11999Data Zone 8 36410168 - 11195Data Zone 7 3788864 - 10167Data Zone 6 3927494 - 8863Data Zone 5 4066789 - 7493Data Zone 4 4203417 - 6788Data Zone 3 4622070 - 3416Data Zone 2 476379 - 2069Data Zone 1 5040 - 378Data Zone 0 Sectors/TrackPhysical CylindersZone
Figure 5. Cylinder allocation
NOTE: Mode Page 3 (Format Device Parameters) and Mode Page 0C (Notch Parameters) provide
methods to determine medium format and zone parameters. See page 107 and page 117.
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4.5Performance characteristics
A drive’s performance is characterized by the following parameters:
ŸCommand overhead
ŸMechanical head positioning
- Seek time
- Latency
ŸData transfer speed
ŸBuffering operation (read ahead/write cache)
NOTE: All the above parameters contribute to drive performance. There are other parameters that contri-
bute to the performance of the actual system. This specification tries to define the bare drive character-
istics, not the system throughput, which depends on the system and the application.
4.5.1Command overhead
Command overhead is defined as the time required:
Ÿfrom last byte of command phase
Ÿto the first byte of data phase
Ÿexcluding
- Physical seek time
- Latency time
- Initiator delay with reconnections
<30 usecCache Hit <400 usecCache Not Hit TimeRead Command Case (Drive is in quiescence state)
Figure 6. Command overhead
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4.5.2Mechanical positioning
4.5.2.1Average seek time (including settling)
6.9 [msec]5.9 [msec]Write 5.9 [msec]4.9 [msec]Read MaxTypicalCommand Type
Figure 7. Mechanical positioning performance
“Typical” and “Max” are given throughout the performance specification by:
Typical Average of the drive population tested at nominal environmental and voltage conditions.
Max Maximum value measured on any one drive over the full range of the environmental and
voltage conditions. (See Environment on page 38 and DC power requirements on
page 40 for ranges.)
The seek time is measured from the start of the actuator's motion to the start of a reliable read or write
operation. “Reliable read or write” implies that error correction/recovery is not used to correct arrival
problems. The average seek time is measured as the weighted average of all possible seek
combinations.
Weighted average = (max+1) (max)
max
Sum
n=1 (max+1-n) (Tn.in+Tn.out)
Where
max = Maximum seek length
n = Seek length (1 to max)
Tn.in = Inward measured seek time for an n track seek
Tn.out = Outward measured seek time for an n track seek
4.5.2.2Full stroke seek time
12.5 [msec]11.5 [mesc]Write 11.5 [msec]10.5 [msec]Read MaximumTypicalFunction
Figure 8. Full stroke seek time
Full stroke seek is measured as the average of 1000 full stroke seeks with a random head switch from
both directions (inward and outward).
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4.5.2.3Cylinder switch time (cylinder skew)
1.6 [msec]Cylinder skew Typical
Figure 9. Cylinder Skew
A cylinder switch time is defined as the amount of time required by the fixed disk to access the next
sequential block after reading the last sector in the current cylinder.
4.5.2.4Head switch time (head skew)
1.1 [msec]Head skew Typical
Figure 10. Head skew
A head switch time is defined as the amount of time required by the fixed disk to access the next
sequential block after reading the last sector in the current track.
4.5.2.5Average latency
3.0 [msec]6.0 [msec]10,000 [RPM] Average LatencyTime for a revolutionRotation
Figure 11. Latency time
4.5.3Drive ready time
29.9 [sec]14.0 [sec]DDYS-T09170 29.9 [sec]14.0 [sec]DDYS-T18350 29.9 [sec]18.0 [sec]DDYS-T36950 MaximumTypicalModel
Figure 12. Drive ready time
4.5.4Spindle stop time
30 [sec]14 [sec]DDYS-T09170 30 [sec]14 [sec]DDYS-T18350 30 [sec]20 [sec]DDYS-T36950 MaximumTypicalModel
Figure 13. Spindle stop time
The period from power off to complete stop of spindle is categorized as operating, and Operating Shock
criteria are applied until complete stop of spindle. Refer to Operating shock on page 50.
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