SEAGATE TECHNOLOGY, INC.
Customer Technical Support FAX Network +1 408 438-8137
Customer Technical Support Bulletin Boards (300-9600, 8-N-1)
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� United States +1 408 438-8771 � United Kingdom +44 628 478011 �
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(C)opyright 1991
ST-1144A and ST-1144A-32
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ST-1144A
UNFORMATTED CAPACITY (MB) ________________N/A
FORMATTED CAPACITY (xx/17 SECTORS) (MB) __130.7
ACTUATOR TYPE ____________________________VOICE COIL
TRACKS ___________________________________14,336
CYLINDERS __PHYSICAL/LOGICAL______________NA/1,001
HEADS ______PHYSICAL/LOGICAL______________7/15
DISCS ____________________________________4
MEDIA TYPE _______________________________THIN FILM
RECORDING METHOD _________________________ZBR RLL (2,7)
TRANSFER RATE INTERNAL (mbits/sec) _______8.2/10/12
SPINDLE SPEED (RPM) ______________________3,528
AVERAGE LATENCY (mSEC) ___________________8.5
BUFFER ___________________________________8 or 32 Kbyte
Read Look-Ahead, Non-Adaptive,
Single-Segmented Buffer
INTERFACE ________________________________AT BUS
SECTORS PER DRIVE ________________________255,255
TPI (TRACKS PER INCH) ____________________1,300
BPI (BITS PER INCH) ______________________21,600
AVERAGE ACCESS (ms) ______________________19
SINGLE TRACK SEEK (ms) ___________________8
MAX FULL SEEK (ms) _______________________40
MTBF (power-on hours) ____________________150,000
POWER REQUIREMENTS: +12V START-UP (amps) _2.0
+12V TYPICAL (amps) __0.7
+5V START-UP (amps) __0.63
+5V TYPICAL (amps) ___0.4
TYPICAL (watts) ______8
MAXIMUM (watts) ______
BUFFERED STEP PULSE RATE (micro sec) _____
WRITE PRECOMP (cyl) ______________________N/A
REDUCED WRITE CURRENT (cyl) ______________N/A
LANDING ZONE (cyl) _______________________AUTO PARK
IBM AT DRIVE TYPE ________________________*
* 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 translation: 1001 cyl, 15 heads, 17 sectors = 130,690,560
Possible translation: 1024 cyl, 14 heads, 17 sectors = 124,780,544
Note: A "custom" or "user-definded" 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.
