Seagate ST11200N User manual

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
_____________________________________________________________________________________
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hawk 1 Family
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST11200N/ND/NC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST1980N/ND/NC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST1830N, ST1950N
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Manual
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
______________________________________________________________________________________

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
_____________________________________________________________________________________
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hawk 1 Family
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST11200N/ND/NC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST1980N/ND/NC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ST1830N, ST1950N
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Product Manual
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
______________________________________________________________________________________
Copyright Notice
© 1994 SeagateTechnology, Inc.All rights reserved
Publication Number: 77738476, Rev. D
June 1994
Seagate, Seagate Technology, Wrenand the Seagate logo are registered trademarks of Seagate
Technology, Inc.SeaFAXTM, SeaFoneTM, SeaTDDTM and SeaBOARDTM are trademarks of SeagateTechnol-
ogy, 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 of SeagateTechnology, Inc.

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
_____________________________________________________________________________________
Revision status summary sheet
Revision Authority Date Writer/Eng. Sheets Affected
A Issue 1/12/93 D. Ashby 1 through 72
B. Norman
B PLD: 83287 3/12/93 D. Ashby 1 through 70.
B. Douglas (Technical changes on pages 17 thru
20, 38, 39, 41 thru 43, and 68).
C PLD: 83504 93 Oct 04 D. Ashby v thru vii, 1 thru 73
D PLD: 83684 94 Jun 13 D. Ashby v thru viii, 1 thru 73
(technical changes on pages 3, 8, 14,
27, 49, 57, 59)
Notice:
Product Manual 77738476 is Volume 1 of a two Volume document with the SCSI interface informa-
tion in the Volume 2 SCSI Interface Product Manual, P/N 77738479.
If the SCSI Interface information is needed the Volume 2 Interface Manual should be ordered, P/N
77738479.
v

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
______________________________________________________________________________________
Table of contents
1.0 Scope ..................................................................................................................................... 1
2.0 Applicable standards and reference documentation........................................................... 2
2.1 Standards ..................................................................................................................... 2
2.2 Applicable reference documents .................................................................................. 3
3.0 General description................................................................................................................. 4
4.0 Standards features.................................................................................................................. 6
4.1 Performance ................................................................................................................. 6
4.1.1 Reliability ......................................................................................................... 6
4.2 Unformatted and formatted capacities.......................................................................... 7
4.3 Options (factory installed)............................................................................................. 7
4.4 Optional accessories (user installed)............................................................................ 7
4.5 Installation .................................................................................................................... 8
5.0 Performance characteristics .................................................................................................. 9
5.1 Internal drive characteristics (transparent to user) ....................................................... 9
5.2 SCSI drive Seek, Read andWrite performance characteristics (Visible to User)......... 9
5.2.1 Seek command execution time........................................................................ 9
5.2.2 Format drive command execution time............................................................10
5.2.3 Read data command execution time ............................................................... 10
5.2.4 Write data command execution time................................................................ 10
5.3 Generalized performance characteristics..................................................................... 10
5.4 Start/stop time .............................................................................................................. 13
5.5 Prefetch/multi segmented cache control.......................................................................13
5.5.1 Cache operation ..............................................................................................13
5.5.2 Prefetch operation ........................................................................................... 14
5.6 Caching write data........................................................................................................15
5.7 Synchronized spindle operation....................................................................................15
6.0 Reliability specifications ........................................................................................................ 19
6.1 Error rates ....................................................................................................................19
6.1.1 Read errors......................................................................................................19
6.1.2 Environmental interference.............................................................................. 19
6.1.3 Write errors ......................................................................................................20
6.1.4 Seek errors ......................................................................................................20
6.2 Reliability and service................................................................................................... 20
6.2.1 Mean time between failure...............................................................................20
6.2.2 Preventive maintenance .................................................................................. 20
6.2.3 Service life .......................................................................................................20
6.2.4 Service philosophy........................................................................................... 21
6.2.5 Installation........................................................................................................21
6.2.6 Service tools .................................................................................................... 21
6.2.7 Product Warranty.............................................................................................21
7.0 Physical/electrical specifications .......................................................................................... 22
7.1 AC power requirements................................................................................................ 22
7.2 DC power requirements................................................................................................22
7.2.1 Conducted noise immunity ..............................................................................23
7.2.2 Power sequencing ........................................................................................... 23
7.2.3 12 V - current profile ........................................................................................ 23
vi

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
_____________________________________________________________________________________
Table of contents
7.3 Heat/power dissipation ................................................................................................. 24
7.4 Environmental limits .....................................................................................................25
7.4.1 Temperature.....................................................................................................25
7.4.2 Relative humidity .............................................................................................27
7.4.3 Effective altitude (sea level ref)........................................................................27
7.4.4 Shock and vibration .........................................................................................27
7.4.5 Air cleanliness .................................................................................................29
7.5 Electromagnetic compatibility ....................................................................................... 29
7.5.1 Electromagnetic susceptibility.......................................................................... 29
7.6 Mechanical specifications............................................................................................. 30
7.6.1 Drive orientation...............................................................................................32
7.6.2 Cooling............................................................................................................. 32
7.6.3 Drive mounting................................................................................................. 32
8.0 Media characteristics ..............................................................................................................33
8.1 Media description .........................................................................................................33
9.0 Defect and error management ............................................................................................... 34
9.1 Drive internal defects/errors .........................................................................................34
9.2 SCSI systems error considerations ..............................................................................34
10.0 Option/configuration headers ................................................................................................ 35
10.1 Drive ID/option select header ....................................................................................... 35
10.2 Synchronized spindles interface...................................................................................39
10.2.1 electrical description ........................................................................................39
10.3 Grounding..................................................................................................................... 40
11.0 Interface requirement..............................................................................................................41
11.1 General description ......................................................................................................41
11.2 SCSI interface messages supported ............................................................................41
11.3 SCSI interface commands supported...........................................................................42
11.3.1 Inquiry data......................................................................................................44
11.3.2 Mode sense data ............................................................................................. 45
11.4 SCSI bus conditions and miscellaneous features supported........................................53
11.5 Synchronous data transfer ...........................................................................................54
11.5.1 Synchronous data transfer periods supported.................................................54
11.5.2 REQ/ACK offset...............................................................................................54
11.6 Physical interface ......................................................................................................... 55
11.6.1 DC cable and connector .................................................................................. 56
11.6.2 Physical characteristics ................................................................................... 56
11.6.3 Connector requirements .................................................................................. 57
11.6.4 Electrical description........................................................................................ 63
11.7 Disc drive timing ...........................................................................................................67
vii

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
______________________________________________________________________________________
12.0 Options..................................................................................................................................... 69
12.1 Front panel ...................................................................................................................69
12.2 Single unit shipping pack ..............................................................................................69
12.3 Drive termination .......................................................................................................... 69
13.0 Accessories ............................................................................................................................. 70
13.1 Front panel kit...............................................................................................................70
13.2 Installation manual........................................................................................................ 70
14.0 Technical support services .................................................................................................... 71
Seagate Peripheral Family................................................................................................................... 72
viii

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
_____________________________________________________________________________________
1.0 Scope
This specification describes the Seagate Technology, Inc. Model Hawk 1 Family Disc Drives. These high
capacity, high performance disc drive products have been designed to support the Small Computer Sys-
tems Interface (SCSI) and are classified as “Intelligent” peripherals.The Model Hawk 1 Family is function-
ally compatible to a subset of the Seagate SCSI-2 Interface Specification 77738479, and the ANSI SCSI-2
standard. The Hawk 1 Family also provides Level 2 conformance (highest level) with the ANSI SCSI-1
standard.Details of the Hawk 1 Family drive SCSI implementation are provided in Section 11 of this speci-
fication, (Vol. 1) and in the SCSI-2 Interface Product Manual P/N 77738479 (Vol. 2;Ver.2).
The Hawk 1 family of drives consists of the ST11200N/ND/NC, ST1980N/ND/NC, ST1950N and ST1830N
drives.
The Hawk 1 Family products will be referred to as “the drive” from this point on unless reference to individual
models are necessary.
The drive printed circuit board is referred to as a PCB.
*50 pin SCSI I/O and 4 pin DC power connector shown. "NC" models have one 80 pin connector and no
separate DC power connector.
Figure 1-1. Hawk 1 N/ND family drive
SEAGATE
*
1

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
______________________________________________________________________________________
2.0 Applicable standards and reference documentation
The drive has been developed as a system peripheral to the highest standards of design and construction.
The drive depends upon its host equipment to provide adequate power and environment in order to achieve
optimum performance and compliance with applicable industry and governmental regulations. Special at-
tention must be given in the areas of safety, power distribution, shielding, audible noise control, and tem-
perature regulation.
2.1 Standards
The Hawk 1 Family complies with Seagate standards as noted in the appropriate sections of this specifica-
tion and the Seagate SCSI-2 Interface Specification, P/N 77738479 (Vol.2, Version 2).
The Hawk 1 Family is a UL Recognized component per UL 1950 and a CSA Certified component per CAN/
CSA-C22.2 No. 950-M89. It also meets the requirements of DIN VDE 0805/05.90 and EN60950: 1988 (IEC
950).
The Hawk 1 family drives, as delivered, are designed for system integration and installation into a suitable
enclosure prior to use.As such the Hawk 1 family drives are supplied as a sub-assembly and is not subject
to Subpart J of Part 15 of the FCC Rules and Regulations nor the Radio Interference Regulations of the
Canadian Department of Communications. However, the unit has been tested using proper shielding and
grounding and found to be compliant with Class A limits of the FCC Rules and the Regulations of The
Canadian Department of Communications.
The physical design characteristics of the Hawk 1 family drives serve to minimize radiation when installed in
an enclosure that provides reasonable shielding.As such, the Hawk 1 family drives are capable of meeting
the Class B limits of the FCC Rules and Regulations of the Canadian Department of Communication. How-
ever, it is the users responsibility to assure that the Hawk 1 family drives meet the appropriate EMI require-
ments in their system. Shielded I/O cables may be required if the enclosure does not provide adequate
shielding. If the I/O cables are external to the enclosure, shielded cables should be used, with the shields
grounded to the enclosure and to the host controller.
Caution. To avoid potential service problems, observe the following precautions:
The Manufacturers installed labels must not be removed from the drive or covered with addi-
tional labels, as they contain information required when servicing the product.
2

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
_____________________________________________________________________________________
2.2. Applicable reference documents
SCSI Installation Handbook Seagate P/N 77738480
Product Manual - SCSI-2 Interface Seagate P/N 77738479
ANSI Small Computer System Interface (SCSI):Document Number ANSI3.131-1986 (X3T9/84.40 Rev.1B)
(X3T9.2/82-2 Rev. 17B) and X3T9.2/86-109 Revision 10C (SCSI-2).
PackageTest Specification: Seagate P/N 30190-001 (under 100 lb)
PackageTest Specification: Seagate P/N 30191-001 (over 100 lb.)
In case of conflict between this document and any referenced document, this document shall take prece-
dence.
3

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
______________________________________________________________________________________
3.0 General description
The drives are a member of a family of low cost, high performance, highly reliable, random access storage
devices designed to meet the needs of the OEM marketplace.
The drive records and recovers data on eight 3.7 inch (95 mm) fixed discs.
The drive supports 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 product specification (Vol. 1), which defines
the product performance characteristics of the Hawk 1 N/ND Family of drives, and the SCSI-2 Interface
Product Manual P/N 77738479 (Vol. 2, Version 2) which describes the general interface characteristics of
this and other families of Seagate 3.5-inch drives.
The drive interface supports multiple initiators, disconnect/reconnect, self configuring host software and
automatic features that relieve the host from the necessity of knowing the physical characteristics of the
target (logical block addressing is used).
The Head/Disc Assembly (HDA) is environmentally sealed at the factory. Air recirculates within the HDA
through a nonreplaceable filter to maintain a contamination free head/disc environment.
Refer to Figure 3.0-1 for an exploded view of the drive. NEVER disassemble the Head/Disc Assembly
(HDA).This exploded view is for information only.Do not attempt to service items in the sealed environmen-
tal enclosure (heads, media, actuator, etc.) as this requires special facilities. The drive contains no parts
replaceable by the user.The drive warranty is voided if the HDA is opened.
The Hawk 1 Family drives use a dedicated landing zone at the innermost radius of the media to eliminate
the possibility of destroying or degrading data by landing in the data zone.The drive automatically goes to
the landing zone when the power is removed.
The Hawk 1 Family drives incorporate an automatic shipping lock which prevents potential damage to the
heads and discs resulting from movement during shipping and handling. The shipping lock disengages
when power is applied to the drive and the head load process begins.
The Hawk 1 Family drives decodeTrack 0 location from the dedicated servo surface to eliminate mechani-
cal transducer adjustments and related reliability concerns.
The Hawk 1 Family drives use a high performance actuator assembly that consists of a low inertia, bal-
anced, patented, straight arm design that provides excellent performance with minimum power dissipation.
4

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
_____________________________________________________________________________________
5
Figure 3.0-1. Hawk 1 family drive
N/ND Family PCB NC Family PCB

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
______________________________________________________________________________________
4.0 Standard features
The Hawk 1 Family has the following standard features:
•Integrated SCSI Controller
•Single Ended and Differential SCSI drivers and receivers
•Asynchronous and Synchronous data transfer protocol
•Firmware downloadable via SCSI interface
•Selectable sector size from 256 to 4096 bytes/sector
•Programmable sector reallocation scheme
•Flawed sector reallocation at format time
•Programmable auto write and read reallocation
•Reallocation of defects on command (Post Format)
· 96 bit Reed-Solomon error correcting code
•Sealed Head/Disc Assembly
•No preventative maintenance or adjustment required
•Dedicated head landing zone
•Automatic shipping lock
•AutomaticThermal Compensation
•PatentedTri-Phase Servo with embedded Grey Code track address to guarantee servo positioning.
•Self diagnostics performed at power on
•1:1 Interleave
•Zoned Bit Recording (ZBR)
•Vertical, horizontal, or top down mounting
•Dynamic spindle brake
•Active termination with removable terminator modules.
•Synchronous spindle capability
•256 K byte data buffer
•5-year warranty
4.1 Performance
•Programmable multi-segmentable cache buffer
•Automatic Adaptive Cache
•Zero Latency Reads
•5411 RPM Spindle.Average latency = 5.4 ms
•Command Queuing of up to 64 commands per initiator
•Background processing of queue
•Supports start and stop commands
•Provides synchronized spindle capability
•Low audible noise for office environment
•Low power consumption
•Balanced low mass rotary voice coil actuator
4.1.1 Reliability
•200,000 hour MTBF
•Adaptive servo compensation for improved seek performance
•LSI circuitry
6

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
_____________________________________________________________________________________
7
4.2 Unformatted and formatted capacities
Formatted capacity depends on the number of spare reallocation sectors reserved and the number of bytes
per sector.The following table shows some typical formatted capacities.
Capacities in Megabytes
Applicable model numbers
Spare Sector or Cylinders ST11200 ST1980 ST1950 ST1830
reserved for reallocation 512* 1024* 512* 1024* 512* 1024* 512* 1024*
No Spares 1066 1116 872 913 814 852 712 747
One Spare Sector
per track/2 spare
cylinders per unit** 1051 1087 860 889 803 831 702 728
One Spare Sector
per cylinder; 2 spare
cylinder per unit** 1064 1114 870 910 812 850 711 745
Unformatted Capacity 1248 1021 953 834
*Bytes per sector. Sector size selectable at format time. Users having the necessary equipment may
modify the data block size before issuing a format command and obtain different formatted capacities than
those listed. User available capacity depends on spare reallocation scheme selected. See Mode Select
Command and Format Command in the SCSI Interface Product Manual P/N 77738479.
**Spare cylinders are on the inner tracks.
The standard OEM model is as follows:
Formatted Data Block Size Unformatted
512 Byte/Sector
ST11200N/ND/NC 1054 MB* 1248 MB
ST1980N/ND 860 MB** 1021 MB
ST1950N 803 MB** 953 MB
ST1830N 702 MB** 834 MB
* Twelve spare sectors per cylinder, two spare cylinders/unit.
** One spare sector per track, two spare cylinders/unit.
4.3 Options (factory installed)
The capacities shown in paragraph 4.2 are available upon request. Other capacities can be ordered de-
pending on sparing scheme and sector size requested.
The following options are incorporated at the time of production. See Section 12.0.
•Front panel (green LED) - See Figure 3.0-1
•Installation Manual P/N 77738480
•SCSI InterfaceTerminating Resistors (Single Ended only)
4.4 Optional accessories (user installed)
The following accessories are available.All kits may be installed in the field. See Section 13.0.
•Front Panel Kit (with green LED) - See Figure 3.0-1
•Single Unit shipping pack kit
•Installation Guide P/N 77738480
•· Adapter Accessory Frame Kit P/N 75790701 (adapts 3.5-inch drive to fit in 5.25-inch drive mounting
space)

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
______________________________________________________________________________________
4.5 Installation
For option jumper locations and definitions refer to Figure 10.1-1. Drive default mode parameters are not
normally needed for installation. Refer to Section 11.3.2 for default mode parameters if they are needed.
•Ensure that the SCSI ID of the drive is not the same as the host adapter.Most host adapters use
SCSI ID 7.
•If multiple devices are on the bus set the drive SCSI ID to one that is not 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.Terminators are
required either on the drive for ST11200N and ST11200NC family models, or external to the drive for
ST11200ND family models.These external terminators must be provided by the user, systems
integrator or host equipment manufacturer.
•If the drive is attached to a bus that contains other devices, and the new drive is not attached to the
end of the bus, the terminators should be removed from the new drive.
•Set all appropriate option jumpers for desired operation prior to power on. If jumpers are changed
after power has been applied, recycle the drive power to make the new settings effective.
•Installation instructions are provided by host system documentation or with any additionally pur-
chased drive installation software. If necessary see section 14.0 for Seagate support services
telephone numbers.
Formatting
•It is not necessary to low level format this drive.The drive is shipped from the factory low level
formatted in 512 byte sectors.
· Reformat the drive if one of the following occurs.
-A different sector size is selected.
-A different spare sector allocation scheme is selected.
8

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
_____________________________________________________________________________________
5.0 Performance characteristics
5.1 Internal drive characteristics (transparent to user)
ST11200 ST1980 ST1950 ST1830
Drive Capacity 1248 1021 953 834 MByte (UNF)
Read/Write Heads 15 13 13 13 Data (Max)
Bytes/Track 41660 45434 46550 48419 Bytes (Avg)
Bytes/Surface 83 78.5 73 64 Mbytes (UNF)
Tracks/Surface, Total 1872 1730 1575 1325 Tracks (user
accessible)
Tracks/Inch 2150 2150 2150 2150 TPI
Servo Heads 1111
Internal Data Rate 23.2-40.6 24.4 - 40.6 25.2-41.2 28.4-41.2Mbits/sec
(variable with
zone)
Disc Rotational Speed 5411+0.5% 5411+0.5% 4535 +0..5% 4535 +0.5% r/min
Average Rotational Latency 5.54 5.54 6.61 6.61 ms
5.2 SCSI Seek, Read andWrite performance characteristics [8]*
Refer to Section 11.7 and to the SCSI-2 Interface Product Manual 77738479 for additional timing details.
5.2.1 Seek time Drive Level
ST11200 ST1980 ST1950 ST1830
Read Write Read Write Read Write Read Write
ms ms ms ms
Average - Typical [3] 10.5 11.2 9.9 10.6 TBD TBD TBD TBD
Max. [2] 12.0 13.0 11.4 12.4 TBD TBD TBD TBD
Single Track- Typical [3] 1.5 2.0 1.5 2.0 TBD TBD TBD TBD
Max. [2] 3.5 4.0 3.5 4.0 TBD TBD TBD TBD
Full Stroke - Typical [3] 20.0 21.0 19.0 20.0 TBD TBD TBD TBD
Max. [2] 23.5 24.5 22.5 23.5 TBD TBD TBD TBD
Including Controller Overhead** [1][4]
ST11200 ST1980 ST1950 ST1830
Read Write Read Write Read Write Read Write
ms ms ms ms
Average - Typical [3] 11.7 12.5 11.1 11.9 TBD TBD TBD TBD
Max. [2] 14.0 15.0 13.4 14.4 TBD TBD TBD TBD
Single Track - Typical [3] 2.6 3.3 2.6 3.3 TBD TBD TBD TBD
Max. [2] 5.5 5.9 5.5 5.9 TBD TBD TBD TBD
Full Stroke - Typical [3] 21.2 22.4 20.2 21.4 TBD TBD TBD TBD
Max. [2] 25.7 27.1 24.7 26.1 TBD TBD TBD TBD
9

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
______________________________________________________________________________________
5.2.2 Format drive command execution time (minutes) [1]
ST11200 ST1980 ST1950 ST1830
Maximum (with verify) 30 min 28 min TBD TBD
Maximum (no verify) 20 min 18 min TBD TBD
* [ ] All notes are listed in Section 5.3.1.
** With disconnect enabled and Read Look Ahead cache disabled.
5.2.3 Read data command execution time [4]*
(512 byte sector size, with disconnect enabled and read look ahead cache disabled)
latency time is included.
a. From CDB reception to the drive request for the first data byte to be transferred to the Host
ST11200 ST1980 ST1950 ST1830
1. Typical (Zero Stroke Seek) [3] 7.2 ms 7.2 ms TBD TBD
2. Typical (Average Seek) [3] 17.5 ms 16.8 ms TBD TBD
3. Maximum (Full Stroke Seek) [2] 36.1 ms 35.1 ms TBD TBD
b. Single Sector Read andTransfer of data to Host (time from receipt of last byte of the CDB to the request
for a status byte transfer to Host) [7].
ST11200 ST1980 ST1950 ST1830
1. Typical (Zero Stroke Seek)[3] 7.3 7.3 ms TBD TBD
2. Typical (Average Seek)[3] 17.6 ms 16.9 ms TBD TBD
3. Maximum (Full Stroke Seek)[2] 36.2 ms 35.2 ms TBD TBD
5.2.4 Write data command execution time [4]
(512 byte sector size, with disconnect disabled and read look ahead disabled) latency
time is included.
a. From CDB reception to the request for the first byte of write data from the Host.
1. Typical 1.5 ms 2. Maximum 1.8 ms
b. Single Sector Write and Data Transfer from Host [6] [7]
(Time from receipt of the last byte of the CDB to the request for a completion status transfer to the Host)
ST11200 ST1980 ST1950 ST1830
1. Typical (Zero Stroke Seek)[3] 7.0 ms 7.0 ms TBD TBD
2. Typical (Average Seek)[3] 18.2 ms 17.6 ms TBD TBD
3. Maximum (Full Stroke Seek)[2] 38.2 ms 37.2 ms TBD TBD
*[ ] All notes are listed in Section 5.3.1.
5.3 Generalized performance characteristics
Minimum Sector Interleave 1 to 1
Data Buffer To/From Disc Media
Data transfer rate (< 1 sector) - 512 Byte Sector
10

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
_____________________________________________________________________________________
continued from previous page
ST11200 ST1980 ST1950 ST1830
Min. [4]* 2.90 3.05 TBD TBD MByte/sec
Avg. [4] 4.14 4.21
Max. [4] 5.07 5.07
Data Buffer To/From Disc Media
Data Transfer Rate (< 1 Track) - 512 Byte Sector
ST11200
Min. [4] 2.50 MByte/sec divided by (Interleave Factor)
Avg. [4] 3.55 MByte/sec divided by (Interleave Factor)
Max. [4] 4.36 Mbyte/sec divided by (Interleave Factor)
ST1980
Min. [4] 2.62 MByte/sec divided by (Interleave Factor)
Avg. [4] 3.61 MByte/sec divided by (Interleave Factor)
Max. [4] 4.36 MByte/sec divided by (Interleave Factor)
ST1950
Min. [4] TBD MByte/sec divided by (Interleave Factor)
Avg. [4] TBD MByte/sec divided by (Interleave Factor)
Max. [4] TBD Mbyte/sec divided by (Interleave Factor)
ST1830
Min. [4] TBD MByte/sec divided by (Interleave Factor)
Avg. [4] TBD MByte/sec divided by (Interleave Factor)
Max. [4] TBD MByte/sec divided by (Interleave Factor)
SCSI Interface Data
Transfer Rate (Asynchronous) [5]
ST11200 ST1980 ST1950 ST1830
-Maximum Instantaneous 5.0** 5.0 TBD TBD MBytes/sec**
-Maximum Average 3.1 3.1 TBD TBD MBytes/sec
Sector Sizes 512 user data blocks (default)
Variable (256 to 4096) in even sector sizes
If sector size (n, bytes) is odd it will be rounded down to n-1.
Synchronous Transfer Rate
From 1.25 MByte/sec to 10.0 MBytes/sec (See section 11.5.)
Read/Write consecutive sectors on a track Yes
Flaw reallocation performance impact (For flaws reallocated using the 1 sector time (typical)
spare sectors per track or cylinder reallocation scheme.)
Flaw reallocation performance impact (For flaws reallocated using the spare 35 ms (typical)
tracks per volume reallocation scheme.)
Track skew incorporated at format time 1.7 ms
Cylinder skew incorporated at format time 3.0 ms
Overhead time for one track cylinder switch <3 ms Typical
Average rotational latency 5.54 ms
* [ ] All notes are listed in Section 5.3.1.
** Assumes system ability to support 5.0 Mb/s and no cable loss.
11

Product Manual - Hawk 1 Family SCSI-2 (Volume 1), Rev. D
______________________________________________________________________________________
5.3.1 Notes for sections 5.2 and 5.3.
[1] Execution time measured from receipt of the last Byte of the Command Descriptor Block (CDB) to the
request for a Status Byte Transfer to the Initiator (excluding latency and data transfer).
[2] Maximum times are specified over the worst case conditions of temperature, voltage margins and drive
orientation. When comparing specified seek times, care should be taken to distinguish between typical
seek times and maximum seek times. The best comparison is obtained by system benchmark tests
conducted under identical conditions.Maximum times do not include error recovery.
[3] Typical Seek values are measured under nominal conditions of temperature, voltage, and horizontal
orientation as measured on a representative sample of drives.
[4] Assumes no errors and no sector has been relocated.
[5] Rate measured from the start of the first sector transfer to or from the Host.
[6] Assumes the Initiator immediately sendsWrite Data to the drive when requested.
[7] Command execution requires a data transfer phase (data to or from the disc media). Assumes the
initiator is instantly ready to send/receive the data when the drive generates first request for a data byte
transfer, and assumes an average data transfer rate between the drive and the Initiator of 5 MBytes/
sec.
[8] All performance characteristics assume that automatic adaptive temperature compensation is not in
process when the SCSI command is received.A SCSI command being executed is not interrupted for
automatic adaptive temperature compensation. If adaptive thermal compensation is in process when a
SCSI command is received, the command is queued until the compensation for the specific head being
compensated completes. When compensation completes for the specific head being compensated, the
first queued SCSI command is executed. When execution of the first queued command is complete, the
drive continues the compensation for the remaining head(s).The above procedure continues until com-
pensation for all heads is completed, or until one minute has elapsed. If the compensation for all heads
is not complete in one minute, the drive performs compensation for all of the remaining heads sequen-
tially without any interruption.The drive initiates an automatic adaptive temperature compensation cycle
approximately once every 10 minutes and only when it detects a bus free condition between com-
mands. Automatic adaptive temperature compensation takes less than 0.1% of bus time. Automatic
temperature compensation also occurs at other times, but should be transparent to the user (e.g.,
during format, Rezero Command, at spindle up, during read error recovery, and during Reassign Block
functions).A Rezero command can be used to reset the thermal compensation timer back to its start so
that the host can know when the interruption for thermal compensation will occur.
12