Drive Ready Time; Table 8. Single Track Seek Time; Table 9. Latency Time; Table 10. Drive Ready Time - Hitachi 7K400 - Deskstar Hard Drive Specifications

4.5.2.3 Head switch time (head skew)
Head switch time-typical (ms)
Head switch time is defined as the amount of time required by the fixed disk to complete a seek of the next sequential track
after reading the last sector in the current track
4.5.2.4 Cylinder switch time (cylinder skew)
Cylinder switch time is defined as the amount of time required by the fixed disk to access the next sequential block after read-
ing the last sector in the current cylinder.
The measuring method is given in Section 4.5.5, "Throughput" on page 18.
4.5.2.5 Single track seek time (without command overhead, including settling)
Table 8: Single Track Seek Time
Function
Read
Write
Read (Quiet Seek mode)
Write (Quiet Seek mode)
Single track seek is measured as the average of one (1) single track seek from every track in both directions (inward and out-
ward).
4.5.2.6 Average latency
Table 9: Latency Time
Rotational speed
(RPM)
7200 RPM

4.5.3 Drive ready time

Table 10: Drive ready time
Power on to ready
Ready The condition in which the drive is able to perform a media access command (for example- read, write) immediately.
Power onThis includes the time required for the internal self diagnostics.
Note: Max Power On to ready time is the maximum time period that Device 0 waits for Device 1 to assert PDIAG.
1.4
Typical (ms) Max (ms)
0.8 1.5
1.3 2.0
0.8 1.5
1.3 2.0
Time for one Average latency
revolution (ms)
8.3
Maximum (sec)
Typical (sec)
20
Deskstar 7K400 Hard Disk Drive Specification
(ms)
4.17
31
16