12 Barracuda 9 Installation Guide, Rev. A
Characteristics ST19171
Interface UltraSCSI1
Capacity
Unformatted 11.7 Gbytes
Formatted29.1 Gbytes
Recording
Cylinders (user) 5,273
Read/write data heads 20
Servo heads Embedded
Seek time3
Average read 9.0 msec
Average write 10.5 msec
Disc rotation
RPM 7,200
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)
1Can also be operated according to SCSI-1 and SCSI-2 proto-
cols.
2Standard 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
3Not including on-board controller overhead.