Product manual

Barracuda 4LP Product Manual, Rev. D 9
4.0 Performance characteristics
4.1 Internal drive characteristics (transparent to user)
4.2 SCSI Seek performance characteristics (visible to user) [6]*
The values given in Section 4.2.1 apply to all models of the Barracuda 4LP family unless otherwise specified.
Refer to Section 9.10 and to the SCSI-2 Interface Product Manual 77738479 for additional timing details.
4.2.1 Access time [8]
*[ ] All notes for Section 4.2 are listed at end of Section 4.2.3.
ST34371 ST32171 ST34571 ST32271
Drive Capacity 5.31 2.65 5.54 2.77 GByte (UNF, rounded off values)
Read/Write Heads 10 5 10 5
Bytes/Track 102,500 102,500 106,980 106,980 Bytes (Avg, rounded off values)
Bytes/Surface 531 531 554 554 Mbytes (UNF, rounded off values)
Tracks/Surface, Total 5,178 5,178 5,178 5,178 Tracks (user accessible)
Tracks/Inch 5,555 5,555 5,555 5,555 TPI
Peak Bits/Inch 123,000 123,000 128,000 128,000 BPI
Internal Data Rate 80-122 80-122 83-126 83-126 Mbits/sec (variable with zone)
Disc Rotational Speed 7,200 7,200 7,200 7,200 r/min
Average Rotational Latency 4.17 4.17 4.17 4.17 ms
Including Controller Overhead
(without disconnect) [1] [4]
Drive Level
Read Write
ms
Average – Typical [3] 9.4 10.4
Max. [2]
10.8
11.3
Single Track – Typical [3] 2.0 2.1
Max. [2]
2.2
2.3
Full Stroke – Typical [3] 17.5 18.5
Max. [2]
20.0 20.5