Table 13. Random Access Performance (Sector Size 512 Byte Case) - Hitachi HUS151473VL3800 - Ultrastar 73.4 GB Hard Drive Specifications

4.5.6.2 Random access
Table 13: Random access performance (sector size 512 Byte case)
Operation Typical (sec)
Random read 24.7
Random write 26.3
The above table gives the time required to execute a total of 4096 single block READ / WRITE commands which
access a random LBA in unqueued mode.
An approximation for the time is:
T = (A + B + C) * 4096
Where:
T = Calculated time
A = Command overhead (no cache hit)
B = Average seek time
C = Average latency
Maximum (sec)
24.8
26.4
Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
15