Barracuda 18XL Product Manual, Rev. A 9
4.0 Performance characteristics
4.1 Internal drive characteristics (transparent to user)
4.2 SCSI performance characteristics (visible to user)*
The values given in Section 4.2.1 apply to all models of the Barracuda 18XL family unless otherwise specified.
Refer to Section 9.10 and to the SCSI Interface Product Manual, part number 75789509, for additional timing
details.
4.2.1 Access time [8]*
4.2.2 Format command execution time (minutes) [1]*
4.2.3 Generalized performance characteristics
Data buffer transfer rate to/from disc media (one 512-byte sector):
*[ ] All notes for Section 4.2 are listed at end of Section 4.2.3.
ST318436 ST318426 ST318416 ST39236 ST39226 ST39216
Drive capacity 18.373 18.373 18.373 9.186 9.186 9.186 Gbyte (formatted,
rounded off values)
Read/write heads 6 6 6 3 3 3
Bytes/track 213 213 213 213 213 213 Kbytes (average,
rounded off values)
Bytes/surface 3,642 3,642 3,642 3,642 3,642 3,642 Mbytes (unformatted,
rounded off values)
Tracks/surface (total) 14,384 14,384 14,384 14,384 14,384 14,384 Tracks (user accessible)
Tracks/inch 18,145 18,145 18,145 18,145 18,145 18,145 TPI
Peak bits/inch 328,272 328,272 328,272 328,272 328,272 328,272 KBPI
Internal data rate 195-315 195-315 195-315 195-315 195-315 195-315 Mbits/sec (variable
with zone)
Disc rotational speed 7,200 7,200 7,200 7,200 7,200 7,200 r/min ± 0.5%
Average rotational
latency 4.17 4.17 4.17 4.17 4.17 4.17 msec
Recording code 16/17 16/17 16/17 16/17 16/17 16/17 EPR4
Including controller overhead (without disconnect) [1] [4]
Drive level (18.373 GB models) Drive level (9.186 GB models)
Read Write Read Write
msec msec
Average – Typical [3] 6.0 6.5 6.0 6.5
Single Track – Typical [3] 0.70 0.70 0.70 0.70
Full Stroke – Typical [3] 10.50 11.00 10.50 11.0
18.373 GB models 9.186 GB models
Maximum (with verify) 30 15
Maximum (no verify) 15 7.5
18.373 GB models 9.186 GB models
Min. [4]* 24.7 24.7 MByte/sec
Avg. [4] 32.1 32.1 MByte/sec
Max. [4] 39.4 39.4 MByte/sec
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