Seagate ST15150N/ND/DC, ST15150W/WD/WC manual Wd/Wc/Dc

Barracuda 4 Installation Guide, Rev. E		15
Characteristics of ST15150 drives
	N/ND	W/WD/WC/DC
SCSI-2 Interface1	Fast	Fast & Wide
Capacity
Unformatted	5,062 Mbytes	5,062 Mbytes
Formatted2	4,294 Mbytes	4,294 Mbytes
Recording
Cylinders (user accessible)	3,711	3,711
Read/Write heads	21	21
Servo heads	1	1
Avg bytes/track	64,160	64,160
Modulation	RLL 1,7 code	RLL 1,7 code
Synchronous SCSI rate
Max burst transfer	10 Mbytes/sec	20 Mbytes/sec
Seek time3
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
Multi-segmented cache
Physical	1,024 Kbytes	1,024 Kbytes
Available to user	977 Kbytes	977 Kbytes

1Can also be operated according to SCSI-1 protocol.

2Standard factory units are formatted as follows:

512data bytes per sector

9spare sectors per cylinder

1cylinder at the inner track reserved for spares

3Not including on-board controller overhead.