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SEAGATE TECHNOLOGY, INC.
1-800-SEAGATE
http://www.seagate.com
(C)opyright 1994
ST-5850A (Decathlon 850 AT)
ÉÍÍÍÍÍÍÍÍÍÍÍ»
º REAR VIEW º Type A and Type B configurations
ÈÍÍÍÍÍÍÍÍÍÍͼ
40 pin I/O Cable Connection
³
J1 ÕÍÍÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍÍ͸ /ÄÄÄÄÄÄÄÄÄ\ TOP (HDA)
ÍÍÍÍÍ͵::::::::::ú::::::::1Æͳ 0 0 0 0 ³ÍÍ
ÔÍÍÍÍÍÍÍÍÍͳÍÍÍÍÍÍÍÍ; ÀÄ5ÄGÄGÄ12Ù BOTTOM
³
ÀÄÄÄ pin-20 removed
ST-5850A
ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
º Front View º Type A configuration has 2x6 jumper block
ÈÍÍÍÍÍÍÍÍÍÍÍÍÍͼ
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ Slave drive ON (OFF for Master)
³ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ Slave Present (used on Master)
ÃÄÅÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ Cable Select pins 1-2 AND 3-4
³ ³ ÚÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄ Dual-drive emulation pins 5-6 AND
(TOP) ³ ³ ³ ³ pins 9-10
³ ³ ³ ³ ÚÄÄÄÄÄÄÄÄÄÄ Spare jumper
³ ³ ³ ³ ³
J8 o o o o o o12
Option Block Í1o o o o o o ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍPWAÍÍÍÍÍÍÍÍÍÍ
³ ³ ³
(BOTTOM) ³ ³ ÀÄÄÄ Remote LED (7-, 8+)
ÀÄÄÄÁÄÄÄÄÄ Master/Slave timing protocol changes to
PDIAG. Makes the drive compatible with
some drives as the slave. Must be used
with pins 1-2 (Slave)
Jumpers on 2-4 and 11-12 are spares, as shipped.
ST-5850A
ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
º Front View º Type B configuration has 2x17 jumper block
ÈÍÍÍÍÍÍÍÍÍÍÍÍÍͼ
ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ Slave drive ON (OFF for Master)
³ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ Slave Present (used on Master)
³ ³ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ Cable Select
³ ³ ³ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄ Ext. Spindle Clock Synch
(TOP) ³ ³ ³ ³ ÚÄÄÄÄÄÄÄÄÄÄÄÄ Remote LED (9-, 10+)
³ ³ ³ ³ ³ ÚÄÄÄÄÄÄÄÄÄÄ Reserved
³ ³ ³ ³ ³ ³ ÚÄpin-16 Ú34
J8 o o o o o o o o o o o o o o o o
Option Block Í1o o o o o o o o o o o o o o o o oÍÍÍÍÍÍÍPWAÍÍÍÍÍÍÍÍÍÍ
³ ³ ÀÂÙ ÀÂÙ ÀÄÄÂÄÄÄÄÙ
(BOTTOM) ³ ³ ³ ³ ³
pin-14 removed ÄÄÙ ³ ³ ³ ÀÄÄÄÄ Reserved
Spare Jumper ÄÄÄÄÙ ³ ÀÄÄÄÄÄÄÄÄÄÄ Spare Jumpers
Dual-Drive Emulation ÄÄÄÄÄÄÄÙ
(requires two jumpers)
Jumpers on 15-16, 21-22, 23-24 are spares.
Dual-Drive Emulation requires jumpers on both 17-18 and 19-20.
Cable Select also requires Slave and Slave Present jumpers ON.
ST-5850A
Decathlon 850
UNFORMATTED CAPACITY _____________________
FORMATTED CAPACITY (xx SECTORS) __________854.7
ACTUATOR TYPE ____________________________VOICE COIL
CYLINDERS __PHYSICAL______________________4,085
HEADS ______PHYSICAL______________________4
DISCS (3.5 in) ___________________________2
MEDIA TYPE _______________________________THIN FILM
HEAD TYPE ________________________________THIN FILM
RECORDING METHOD _________________________ZBR RLL (1,7)
INTERNAL TRANSFER RATE (Mbits/sec) _______32.45 to 61.65
EXTERNAL TRANSFER RATE (Mbytes/sec) ______up to 16.6
PIO MODE _________________________________4
DMA SUPPORT ______________________________EISA Type B
SPINDLE SPEED (RPM) ______________________5,376
AVERAGE LATENCY (mSEC) ___________________5.56
BUFFER ___________________________________256 Kbyte SeaCache
Read/Write Multiple, Read Look-Ahead,
Multi-Segmented
INTERFACE ________________________________AT
SECTORS PER DRIVE (LBA mode) _____________1,669,260
TPI (TRACKS PER INCH) ____________________4,250
BPI (BITS PER INCH) ______________________69,355
AVERAGE ACCESS (ms) ______________________12
SINGLE TRACK SEEK (ms) ___________________3.5
MAX FULL SEEK (ms) _______________________25
MTBF (power-on hours) Office _____________500,000
SHOCK (G's):
operating (Read/Write) __________2
nonoperating ____________________75
ACOUSTICS (dBa) (typ/max) ________________30/38
POWER DISSIPATION (watts) ________________
POWER REQUIREMENTS: +12V START-UP (amps) _1.9
POWER MANAGEMENT (Watts):
ACTIVE _______________7.0
IDLE _________________3.10
STANDBY ______________1.00
WRITE PRECOMP (cyl) ______________________N/A
REDUCED WRITE CURRENT (cyl) ______________N/A
LANDING ZONE (cyl) _______________________AUTO
IBM AT DRIVE TYPE ________________________*
Physical:
Height (inches/mm): 0.748/19
Width (inches/mm): 4.00/101.6
Depth (inches/mm): 5/127
Weight (lbs/kg): 1.0/0.45
* MAY REQUIRE FORMATTING AND PARTITIONING SOFTWARE. ALSO, CHECK TO
SEE IF YOUR CMOS SETUP HAS A "CUSTOM" OR "USER DEFINABLE" DRIVE TYPE
AVAILABLE. (see below)
Possible translations:
This translation is generally acceptable, as
is, for non-DOS operating systems:
1656 cyl, 16 heads, 63 sectors = 854,654,976
DOS operating systems may require a system bios
that accepts larger values for the CMOS head
parameter which lowers cylinders below 1024:
828 cyl, 32 heads, 63 sectors = 854,654,976
Other FULL-CAPACITY solutions for DOS operating
systems include third-party drive preparation
software or bios driven host adapters. Otherwise,
capacity may be limited to:
827 cyl, 16 heads, 63 sectors = 426,811,392 (Master)
827 cyl, 16 heads, 63 sectors = 426,811,392 (Slave see Dual
Drive emulation jumper)
Note: A "custom" or "user-defined" CMOS drivetype may ask for a
numerical value for the Write Precompensation cylinder and for the
Landing Zone cylinder. A basic rule-of-thumb for drive models that do
not require the old Write Precomp technique or a Landing Zone because
they are Auto-Parking is to add 1 to the cylinder value being used. As
an example: If cylinders equaled 820, then both Write Precomp and
Landing Zone would be entered as 821. Some BIOS will convert this to
65535 or -1, which are functionally equivalent to "none (not used)".
PHYSICAL/LOGICAL equivalent to NATIVE/TRANSLATION
ZBR = Zone Bit Recording = Variable sectors per track
Already low-level formatted at the factory.
Since a User-definable or Custom translation geometry may be used, it
is imperative that the values be written down and kept with your
permanent records for retrieval in the event of CMOS battery failure.
Seagate reserves the right to change, without notice, product
offerings or specifications. (5/14/95)
A copy of this specification file may be obtained
by FTP at
ftp://ftp.seagate.com/techsuppt/at/st5850a.txt.
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