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16 Barracuda 9 Installation Guide, Rev. B
Characteristics ST19171
Interface SCSI Fast-20 (also called
Ultra SCSI)
1
Capacity
Unformatted 11.7 Gbytes
Formatted
2
9.1 Gbytes
Recording
Cylinders (user) 5,274
Read/write data heads 20
Servo heads Embedded
Seek time
3
Average read 9.7 msec
Average write 10.7 msec
Disc rotation
RPM 7,200 ±0.5%
Average latency 4.17 msec
Internal transfer rate 80 to 124
(Mbits/sec, variable with zone)
Max sync. SCSI transfer rate
N 20 Mbytes/sec
W/WD/WC/DC 40 Mbytes/sec
Multi-segmented cache 512 Kbytes
2,048 Kbytes (optional)
1
Can also be operated according to SCSI-1 and SCSI-2 proto-
cols.
2
Standard factory units are formatted as follows:
512 data bytes per sector
9 spare sectors per cylinder
1 cylinder at the inner track reserved for spares
3
Includes on-board controller overhead.