Product manual

Barracuda 9 Product Manual, Rev. C 9
4.0 Performance characteristics
4.1 Internal drive characteristics (transparent to user)
[1] Rounded off values
4.2 SCSI seek performance characteristics (visible to user)
The values given in Section 4.2.1 apply to all Barracuda 9 models unless otherwise specified. Refer to Section
9.10 and to the
SCSI Interface Product Manual (part number 77738479) for additional timing details.
4.2.1 Access time [7]
4.2.2 Format command execution time
4.2.3 General performance characteristics
Data buffer data transfer rate to/from disc media (one 512-byte sector):
Data buffer data transfer rate to/from disc media (< 1 track):
[ ] All notes for Sections 4.2 are listed at end of Section 4.2.3.
ST19171
Drive capacity 11.7 Gbyte (unformatted) [1]
Read/write heads 20
Bytes/track 102,000 Bytes (average, unformatted) [1]
Bytes/surface 585 Mbytes (unformatted)
Tracks/surface, total 5,274 Tracks (user accessible)
Tracks/inch 5,555 TPI
Bits/inch, minimum 91,500 BPI
Bits/inch, maximum 124,500 BPI
Internal data rate 80-124 Mbits/sec (variable with zone)
Disc rotational speed 7,200 ± 0.5% r/min
Average rotational latency 4.17 msec
Including controller overhead
(without disconnect) [2] [3]
Drive level
Read Write
msec
Average Typical [2] 9.7 10.7
Single track Typical [2] 0.8 1.4
Full stroke Typical [2] 19.2 20.2
Maximum (with verify) <
3 hours
Maximum (no verify) <
2 hours
Minimum sector interleave 1 to 1
Minimum [3] 10 Mbytes/sec
Average [3] 13.5 Mbytes/sec
Maximum [3] 15.5 Mbytes/sec
Minimum [3] 7.8 Mbytes/sec divided by (interleave factor)
Average [3] 10.5 Mbytes/sec divided by (interleave factor)
Maximum [3] 12.2 Mbytes/sec divided by (interleave factor)