Product manual

8 Product Manual - Hawk 2 Family (Wide bus) SCSI-2 (Volume 1), Rev. A
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5.0 Performance characteristics
5.1 Internal drive characteristics (transparent to user)
ST12400W/WD/WC
Drive Capacity 2537 MByte (UNF)
Read/Write Heads 19 Data (Max)
Bytes/Track 50,945 Bytes (Avg)
Bytes/Surface 131.3 Mbytes (UNF)
Tracks/Surface, Total 2621 Tracks (user
accessible)
Tracks/Inch 3000 TPI
Servo Heads 1
Internal Data Rate 26.8 to 45.6 Mbits/sec
(variable with
zone)
Disc Rotational Speed 5411 +0.5% r/min
Average Rotational Latency 5.54 ms
5.2 SCSI Seek, Read and Write performance characteristics (visible to user) [8]
Refer to Section 11.7 and to the SCSI-2/SCSI-3 Interface Product Manual 77738479 for additional timing
details.
5.2.1 Seek time
Drive Level
ST12400W/WD/WC
Read Write
ms
Average - Typical [3]* 9.3 10.8
Max. [2] 11.1 12.6
Single Track - Typical [3] 1.0 1.7
Max. [2] 1.5 2.0
Full Stroke - Typical [3] 21.0 22.5
Max. [2] 23.0 24.0
Including Controller Overhead
(without disconnect) [1] [4]
ST12400W/WD/WC
Read Write
ms
Average - Typical [3] 10.3 11.8
Max. [2] 12.1 13.6
Single Track - Typical [3] 2.0 2.7
Max. [2] 2.5 4.0
Full Stroke - Typical [3] 22.0 23.5
Max. [2] 24.0 25.0