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8 Barracuda 36ES2 Product Manual, Rev. B
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 36ES2 family unless otherwise speci-
fied. Refer to Section 9.10 and to the
SCSI Interface Product Manual
, part number 75789509, for additional
timing details.
4.2.1 Access time [5]
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):
ST336938/
ST336918
ST318438/
ST318418
Drive capacity 36.954 19.924 Gbytes (formatted, rounded off)
Read/write heads 2 2
Bytes/track 401 401 KBytes (average, rounded off)
Bytes/surface 18.477 18.477 Mbytes (unformatted, rounded off)
Tracks/surface (total) 56,332 26,000 Tracks (user accessible)
Tracks/inch 58,480 58,480 TPI
Peak bits/inch 480 480 KBPI
Internal data rate 298-500 434-500 Mbits/sec (variable with zone)
Disc rotational speed 7,200 7,200 r/min (+
0.5%)
Average rotational latency 4.17 4.17 msec
Including controller overhead
(without disconnect) [1] [3]
Not including controller overhead
(without disconnect) [1] [3]
Drive level Drive level
Read Write Read Write
36 Gbyte Model msec msec
Average–Typical [2] 8.7 9.5 8.5 9.3
Single Track–Typical [2] 0.8 1.2 0.6 1.0
Full Stroke–Typical [2] 15.1 15.8 14.9 15.6
18 Gbyte Model
Average–Typical [2] 7.1 7.7 6.9 7.5
Single Track–Typical [2] 0.8 1.2 0.6 1.0
Full Stroke–Typical [2] 10.2 10.9 10.0 10.7
ST336938, ST336918
ST318438, ST318418
Maximum (with verify) 46
Maximum (no verify) 23
Minimum sector interleave 1 to 1
Minimum [3]* 32.3 Mbytes/sec
Average [3] 45.9 Mbytes/sec
Maximum [3] 52.2 Mbytes/sec