14
ST11950 and ST12550 Installation Guide, Rev. D
Characteristics
ST11950N/ND
ST11950W/WD
Interface
Fast SCSI-2
1
Fast & Wide SCSI-2
1
Multi-seg. cache
1,024 Kbytes
1,024 Kbytes (W)
512 Kbytes (WD)
Capacity
Unformatted
2,030 Mbytes
2,030 Mbytes
Formatted
2
1,690 Mbytes
1,690 Mbytes
Recording
Cylinders (user)
2,706
2,706
Heads
15
15
Avg sectors/track
81 (51h)
81 (51h)
Avg bytes/track
49,768
49,768
Modulation
RLL 1,7 code
RLL 1,7 code
SCSI rate
Max burst transfer
10 Mbytes/sec
20 Mbytes/sec
Seek time
3
Average read
8.0 msec
8.0 msec
Average write
9.0 msec
9.0 msec
Disc rotation
RPM
7,200
7,200
Average latency
4.17 msec
4.17 msec
1
Can also be operated according to SCSI-1 protocol.
2
Standard factory units are formatted as follows:
512 data bytes per sector, 6 spare sectors per cylinder
1 cylinder at the inner track reserved for spares
3
Not including on-board controller overhead.
