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Barracuda 180 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 180 family unless otherwise specified.
Refer to Section 9.10 and to the SCSI Interface Product Manual 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):
SCSI interface data transfer rate (asynchronous):
Maximum instantaneous one byte wide 5.0 Mbytes/sec [4]
Maximum instantaneous two bytes wide 10.0 Mbytes/sec [4]
Synchronous formatted transfer rate
Ultra2 SCSI Ultra160 SCSI
In low voltage differential (LVD) interface mode 5.0 to 80 Mbytes/sec 5.0 to 160 Mbytes/sec
ST1181677
Drive capacity 181.6 GBytes (formatted, rounded off values)
Read/write heads 24
Bytes/track 406,071 Bytes (average, rounded off values)
Bytes/surface 19,263 Mbytes (unformatted, rounded off values)
Tracks/surface (total) 24,247 Tracks (user accessible)
Tracks/inch 31,200 TPI
Peak bits/inch 490 KBPI
Internal data rate 282-508 Mbits/sec (variable with zone)
Disc rotational speed 7,200 r/min (+
0.5%)
Average rotational latency 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
msec msec
Average—Typical [2] 7.6 8.4 7.4 8.2
Single Track—Typical [2] 1.0 1.3 0.8 1.1
Full Stroke—Typical [2] 16.2 17.2 16.0 17.0
ST1181677
Maximum (with verify) 210
Maximum (no verify) 120
Minimum sector interleave 1 to 1
Minimum [3]* 25.3 MByte/sec
Average [3] 36.1 MByte/sec
Maximum [3] 47.0 MByte/sec