Seagate ST15150N - Barracuda 4.3 GB Hard Drive User manual

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Barracuda 4 Disc Drive
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ST15150N/ND
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ST15150W/WD/WC/DC
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Product Manual, Volume 1
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Barracuda 4 Disc Drive
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ST15150N/ND
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ST15150W/WD/WC/DC
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Product Manual, Volume 1
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© 1996 Seagate Technology, Inc. All rights reserved
Publication number: 83328880, Rev. D
February 1996
Seagate®, Seagate Technology®, and the Seagate logo are registered
trademarks of Seagate Technology, Inc. Barracuda™ is a trademark of
Seagate Technology, Inc. Other product names are registered trademarks
or trademarks of their owners.
Seagate reserves the right to change, without notice, product offerings or
specifications. No part of this publication may be reproduced in any form
without written permission from Seagate Technology, Inc.

Revision status summary sheet
Sheets
Revision Date Writer/Engineer Affected
A 06/27/94 L. Newman/J. Olson All
B 03/08/95 L. Newman/J. Olson 1, 8, 9, 14, 17, 24, 25,
26, 27, 28, 29, 30, 31,
35, 36, 37, 38, 39, 43,
49, 53, 54, 55, 56, 57,
59, 60, 61, 62, 63, 66,
67, 68, 70, 71, 72, 74,
75, 82, 83, 84.
C 06/07/95 L. Newman/J. Olson 11, 12, 29, 33, 34, 35,
36, 41, 42, 54, 59, 60,
61, 62, 65, 70, 71
D 02/07/96 L. Newman/J. Olson 1, 3, 40, 41, 48, 49,
51, 52, 53, 59, 60, 61,
62, 65, 68, 70
Note. Product Manual 83328880 is Volume 1 of a two-volume
documentwiththeSCSIinterfaceinformationinthe Volume
2SCSI-2InterfaceProductManual, PartNumber77738479.

Contents
1.0 Scope................................................................................................................................... 1
2.0 Applicable standard and reference documentation......................................................... 3
2.1 Standards .................................................................................................................... 3
2.2 Applicable reference documents.................................................................................. 3
3.0 General description ............................................................................................................ 5
4.0 Standard features ............................................................................................................... 7
4.1 Performance ................................................................................................................ 7
4.1.1 Reliability ......................................................................................................... 7
4.2 Unformatted and Formatted Capacities ....................................................................... 8
4.3 Options ........................................................................................................................ 8
4.3.1 Front panel....................................................................................................... 8
4.3.2 Single-unit shipping pack ................................................................................. 8
4.3.3 Barracuda 4 Installation Guide......................................................................... 8
4.3.4 Adaptor accessory frame kit ............................................................................ 8
4.4 Installation.................................................................................................................... 9
5.0 Performance characteristics.............................................................................................11
5.1 Internal drive characteristics .......................................................................................11
5.2 SCSI seek performance characteristics ......................................................................11
5.2.1 Seek time........................................................................................................13
5.2.2 Format drive command execution time ...........................................................13
5.3 General performance characteristics ..........................................................................14
5.4 Start/stop time.............................................................................................................15
5.5 Prefetch/multi-segmented cache control .....................................................................15
5.6 Caching write data ......................................................................................................17
5.7 Synchronized spindle operation ..................................................................................17
6.0 Reliability specifications ...................................................................................................21
6.1 Error rates...................................................................................................................21
6.1.1 Environmentalinterference .............................................................................21
6.1.2 Write errors .....................................................................................................21
6.1.3 Seek errors .....................................................................................................22
6.2 Reliability and service .................................................................................................22
6.2.1 Mean time between failures (MTBF) ...............................................................22
6.2.2 Air flow............................................................................................................22
6.2.3 Preventivemaintenance .................................................................................30
6.2.4 Service life ......................................................................................................30
6.2.5 Service philosophy..........................................................................................30
6.2.6 Installation.......................................................................................................30
6.2.7 Service tools ...................................................................................................30
6.2.8 Hot plugging Barracuda 4 disc drives .............................................................31
7.0 Physical/electrical specifications .....................................................................................33
7.1 AC power requirements ..............................................................................................33
7.2 DC power requirements ..............................................................................................33
7.2.1 Conducted noise immunity..............................................................................34
7.2.2 Power sequencing ..........................................................................................34
7.2.3 12V current profile ..........................................................................................35

7.3 Heat/powerdissipation................................................................................................36
7.4 Environmentallimits....................................................................................................36
7.4.1 Temperature....................................................................................................36
7.4.2 Relative humidity ............................................................................................36
7.4.3 Effective altitude (sea level) ............................................................................37
7.4.4 Shock and vibration ........................................................................................37
7.4.5 Air cleanliness.................................................................................................38
7.4.6 Acoustics ........................................................................................................38
7.5 Electromagneticcompatibility......................................................................................38
7.6 Mechanical specifications ...........................................................................................39
7.6.1 Drive orientation..............................................................................................42
7.6.2 Cooling ...........................................................................................................42
8.0 Media characteristics ........................................................................................................43
8.1 Media description........................................................................................................43
9.0 Defect and error management ..........................................................................................45
9.1 Drive internal defects/errors ........................................................................................45
10.0 Drive configuration............................................................................................................47
10.1 Option headers ...........................................................................................................47
10.1.1 ST15150N/ND drives option headers .............................................................47
10.1.2 ST15150W/WD drives option headers ............................................................50
10.1.3 ST15150WC/DC drives option headers ..........................................................53
10.2 Synchronized spindles interface .................................................................................55
10.2.1 Electrical description .......................................................................................55
10.3 Grounding ...................................................................................................................57
10.4 Drive termination.........................................................................................................57
11.0 Interface requirements ......................................................................................................59
11.1 General description.....................................................................................................59
11.2 SCSI interface messages supported...........................................................................59
11.3 SCSI interface commands supported..........................................................................60
11.3.1 Inquiry data.....................................................................................................62
11.3.2 Mode sense data ............................................................................................63
11.4 SCSI bus conditions and miscellaneous features supported.......................................66
11.5 Synchronous data transfer..........................................................................................67
11.5.1 Synchronous data transfer periods supported ................................................67
11.5.2 REQ/ACK offset..............................................................................................67
11.6 DC cable and connector .............................................................................................67
11.7 SCSI physical interface...............................................................................................68
11.7.1 Physical characteristics ..................................................................................69
11.7.2 Connectorrequirements .................................................................................70
11.7.3 Electrical description .......................................................................................71
11.8 SCSI non-wide physical interface ...............................................................................75
11.9 SCSI wide physical interface.......................................................................................78
11.10SCSI SCA physical interface.......................................................................................81
11.11Disc drive SCSI timing ................................................................................................84
Index ............................................................................................................................................87

Figures
Figure 1. Barracuda 4 disc drive ............................................................................................. 1
Figure 2. Barracuda disc drive (exploded view) ...................................................................... 5
Figure 3. OEM interruptible thermal calibration implementation .............................................. 13
Figure 4. Synchronized drive interconnect diagram ................................................................ 17
Figure 5. Synchronized reference signal characteristics ......................................................... 18
Figure 6. Air flow ..................................................................................................................... 23
Figure 7. AYHX temperature measurement locations ............................................................. 24
Figure 8. LYHX temperature measurement locations.............................................................. 25
Figure 9. MYHX temperature measurement locations............................................................. 26
Figure 10. NYHX temperature measurement locations ............................................................. 27
Figure 11. JYHX temperature measurement locations .............................................................. 28
Figure 12. KYHX temperature measurement locations ............................................................. 29
Figure 13. Temperature measurement location......................................................................... 30
Figure 14. Typical Barracuda 4 drive +12V current profile......................................................... 35
Figure 15. Mounting configuration dimensions for N/ND drives................................................. 39
Figure 16. Mounting configuration dimensions for W/WD drives ............................................... 40
Figure 17. Mounting configuration dimensions forWC/DC drives .............................................. 41
Figure 18. Recommended mounting ......................................................................................... 42
Figure 19. ST15150N/ND drives option header locations.......................................................... 47
Figure 20. ST15150N/ND drives option select jumper connectors ............................................ 48
Figure 21. ST15150W/WD drives option header locations ........................................................ 50
Figure 22. ST15150W/WD drives option select jumper connectors........................................... 51
Figure 23. ST15150WC/DC drives option header locations ...................................................... 53
Figure 24. ST15150WC/DC drives option select jumper connectors......................................... 53
Figure 25. SCSI reference index signal driver/receiver combination ......................................... 55
Figure 26. ST15150N/ND drives configuration select header specification ............................... 56
Figure 27. ST15150W/WD drives configuration select header specification.............................. 56
Figure 28. ST15150N/ND drives physical interface................................................................... 68
Figure 29. ST15150W/WD drives physical interface ................................................................. 68
Figure 30. ST15150WC/DC drives physical interface ............................................................... 68
Figure 31. Single-ended transmitters and receivers .................................................................. 72
Figure 32. Typical differential I//O line transmitter/receiver and terminators .............................. 73
Figure 33. Non-shielded SCSI device connector....................................................................... 75
Figure 34. Wide SCSI device connector.................................................................................... 78
Figure 35. SCA SCSI device connector .................................................................................... 81

ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D 1
1.0 Scope
This manual describes Seagate Technology®, Inc. Barracuda™ 4 disc
drives.
Barracuda drives support the Small Computer System Interface-2(SCSI-2)
as described in the ANSI SCSI and SCSI-2 interface specifications to the
extent described in this manual. This manual defines the performance
characteristics of the Barracuda 4 drives. The SCSI-2 Interface Product
Manual (part number 77738479) describes the general SCSI interface
characteristics of this and other families of Seagate drives.
N/ND type
W/WD type
WC/DC type
Figure 1. Barracuda 4 disc drives

2 ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D

ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D 3
2.0 Applicable standard and
reference documentation
Seagatetakesall reasonable stepstoinsurethatits products arecertifiable
to currently accepted standards. Typical applications of these disc drives
include customer packaging and subsystem design.
Safety agencies conditionally certify component parts, such as the Barra-
cudadiscdrive,basedontheirfinalacceptabilityintheend-useproduct.The
subsystem designer is responsible for meeting these conditions of accept-
ability in obtaining safety/regulatory agency compliance in their end use
product and certifying where required by law.
2.1 Standards
The Barracuda disc drive is a UL recognized component per UL1950, CSA
certified to CSA C22.2 No. 950-M89, and VDE certified to VDE 0805 and
EN60950.
If this model has the CE Marking, it complies with the European Union
requirementsof theElectromagneticCompatibilityDirective89/336/EECof
03 May 1989 as amended by Directive 92/31/EEC of 28 April 1992 and
Directive 93/68/EEC of 22 July 1993.
Seagateusesanindependentlaboratorytoconfirmcompliancetotheabove
directives. Drives are tested in representative systems for typical applica-
tions. The selected system represents the most popular characteristics for
test platforms. The system configurations include:
• 486, Pentium, and PowerPC Microprocessors
• 3.5-inch floppy disc drive
• Keyboard
• Monitor/display
AlthoughthetestsystemwiththisSeagatemodelcompliestothedirectives,
we cannot guarantee that all systems will comply. The computer manufac-
turer or system integrator shall confirm EMC compliance and provide CE
Marking for their product.
The Barracuda disc drive is supplied as a component part. It is the respon-
sibility of the subsystem designer to meet EMC/regulatory requirements.
Engineeringtestcharacterizationsofradiatedemissionsareavailablefrom
the Seagate safety department.
2.2 Applicable reference documents
Barracuda 4 Installation Guide
Seagate part number: 83328870
SCSI-2 Interface Product Manual (volume 2)
Seagate part number: 77738479
ANSI small computer system interface (SCSI) documents
ANSIX3.131-1986 (SCSI-1)
X3T9.2/86-109 Rev. 10H (SCSI-2)
X3T9.2/91-010 Rev. 10 (SCSI-3) Parallel Interface
Incaseofconflictbetweenthisdocumentandanyreferenceddocument,this
document takes precedence.

4 ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D

ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D 5
Figure 2. Barracuda 4 disc drive (exploded view)
3.0 General description
Barracuda drives are low cost, high performance, random access storage
devicesdesignedtomeettheneedsoftheoriginalequipmentmanufacturer
(OEM) marketplace.
The Barracuda drive’s interface supports multiple initiators, disconnect/
reconnect, self-configuring host software, and automatic features that re-
lievethehostfromknowingthephysicalcharacteristicsofthetargets(logical
block addressing is used).
Theheadanddiscassembly(HDA)isenvironmentallysealedatthefactory.
Air circulates within the HDA through a non-replaceable filter to maintain a
contamination-free HDA environment.
Referto Figure2foran explodedviewof thedrive.This explodedviewisfor
informationonly—neverdisassembletheHDAanddonotattempttoservice
itemsin the sealedenclosure(heads,media,actuator, etc.) asthisrequires
specialfacilities.Thedrivecontainsnoreplaceableparts.OpeningtheHDA
voids your warranty.

6 ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D
Barracudadrivesuseadedicatedlandingzoneattheinnermostradiusofthe
mediato eliminatethepossibilityof destroyingordegrading databylanding
inthedata zone. Thedriveautomaticallygoesto the landingzonewhenthe
power is removed.
An automatic shipping lock prevents potential damage to the heads and
discsthatresultsfrommovementduringshippingandhandling.Theshipping
lock disengages when power is applied to the drive and the head load
process begins.
Barracuda drives decode track 0 location data from the dedicated servo
surfacetoeliminatemechanicaltransduceradjustmentsandrelatedreliabil-
ity concerns.
A high-performance actuator assembly with a low inertia, balanced, pat-
ented, straight arm design provides excellent performance with minimal
power dissipation.

ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D 7
4.0 Standard features
Barracuda 4 drives have the following standard features:
• Integrated SCSI controller
• Single-ended or differential SCSI drivers and receivers
• Asynchronous and synchronous data transfer protocols
• Firmware downloadable using a SCSI interface
• Selectable sector size from 180 to 4,096 bytes per sector
• Programmable sector reallocation scheme
• Flawed sector reallocation at format time
• Programmable auto write and auto read reallocation
• Reallocation of defects on command (post format)
• 96-bit Reed-Solomon error correction code
• Sealed head and disc assembly (HDA)
• No preventive maintenance or adjustments required
• Dedicated head landing zone
• Automatic shipping lock
• Automatic thermal compensation
• Embedded Grey Code track address to eliminate seek errors
• Self-diagnostics performed at power-on
• 1:1 interleave
• Zone bit recording (ZBR)
• Vertical, horizontal, or top-down mounting
• Dynamic spindle brake
• Active termination for single-ended models
• 1,024 Kbyte data buffer (see Section 5.5)
4.1 Performance
• Programmable multi-segmentable cache buffer
• 7,200 RPM spindle; average latency = 4.17 msec
• Command queuing of up to 64 commands
• Background processing of queue
• Supports start and stop commands
• Provides synchronized spindle capability
• Low audible noise for office environment
• Low power consumption
4.1.1 Reliability
• 800,000 hour MTBF
• Adaptive seek velocity; improved seek performance
• LSI circuitry
• Balanced low-mass rotary voice-coil actuator

8 ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D
4.2 Unformatted and Formatted Capacities
Standard OEM models are formatted to 512 bytes per block.
ST15150 drives have nine (9) spare sectors per cylinder and one (1) spare
cylinder per unit.
Formatted Unformatted
4,294 Mbytes 5,062 Mbytes
Users having the necessary equipment may modify the data block size
before issuing a format command to obtain different formatted capacities.
User-available capacity also depends on the spare reallocation scheme
selected.SeetheModeSelectcommand andthe Format command inthe
SCSI-2 Interface Product Manual (part number 77738479).
4.3 Options
The following items are incorporated at the time of production or are
available as accessories. All kits may be installed in the field.
• Front panel kit (green lens), part number 70869751
• Single-unit shipping pack kit
• Barracuda 4 Installation Guide, part number 83328870
• Adapter accessory frame kit, part number 75790701 (adapts a 3.5-inch
drive to fit in a 5.25-inch drive mounting space)
4.3.1 Front panel
The front panel normally available is black plastic. You may order other
colors. Each panel has a single rectangular green LED indicator lens that,
when glowing, indicates the drive is selected.
4.3.2 Single-unit shipping pack
The drive is normally shipped in bulk packaging to provide maximum
protectionagainsttransitdamage.Units shippedindividuallyrequireaddi-
tional protection as provided by the single-unit shipping pack. Users
planning single-unit distribution should specify this option.
4.3.3 Barracuda 4 Installation Guide
Part number 83328870
Thismanualprovidesbasicinformation abouthowtoinstallthedrive.Italso
includes information to assist in obtaining service for the drive.
4.3.4 Adaptor accessory frame kit
Part number 75790701
This kit contains the frame to allow a 3.5-inch drive to be mounted in a
5.25-inch form factor. It includes mounting hardware, front panel with a
green lens, an LED with cable that connects to the remote LED connector,
and installation instructions.

ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D 9
4.4 Installation
For option jumper locations and definitions refer to Figures 20, 22, or 24.
Drive defaultmode parameters are not normally needed for installation.
Refer to Section 11.3.2 for default mode parameters if you need them.
• Ensure that the SCSI ID of the drive is not the same as the host adapter.
• Ifmultipledevicesareonthebus,setthedrive’sSCSIIDtoonethatisnot
presently used by other devices on the bus.
• If the drive is the only device on the bus, attach it to the end of the SCSI
bus cable. Internal termination is available on single-ended (ST15150N/
W/WC) drives by enabling this feature with a jumper (see Section 10).
External terminators are required for differential (ST15150ND/WD/DC)
drives. These external terminators must be provided by the user,
systems integrator, or host equipment manufacturer.
• If you attach the drive to a bus that contains other devices, and the new
driveisnotattachedtotheendofthebus,removetheterminationfromthe
new drive.
• Set all appropriate option jumpers prior to applying power to the drive.
Ifyouchangejumpersafterapplying power,recyclethedrive’spowerto
make the new settings effective.
Formatting
• Itisnotnecessarytolow-levelformatthisdrive.Thedriveisshippedfrom
the factory low-level formatted in 512-byte sectors.
• Reformat the drive if:
a. You select a different sector size.
b. You select a different spare-sector allocation scheme.

10 ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D