Table 8.Single Track Seek Time; Table 9.Latency Time; Table 10.Drive Ready Time - Hitachi 7K250 - Deskstar - Hard Drive Specifications

4.4.2.4 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 reading the last sector in the current cylinder.
The measuring method is given in Section 4.4.5, "Throughput" on page 19.
4.4.2.5 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 outward).
4.4.2.6 Average latency
Table 9: Latency Time
Rotational speed
(RPM)
7200 RPM
4.4.3 Drive ready time
Table 10: Drive ready time
Power on to ready
80 GB models
160 GB models
250 GB models
Ready
Power on
Note: Max Power On to ready time is the maximum time period that Device 0 waits for Device 1 to assert PDIAG.
Typical (ms)
0.8
1.3
0.8
1.3
Time for one
revolution (ms)
8.3
Typical (sec)
6
8
10
The condition in which the drive is able to perform a media access command (for exam-
ple- read, write) immediately.
This includes the time required for the internal self diagnostics.
Deskstar 7K250 Hard Disk Drive Specification
Max (ms)
1.5
2.0
1.5
2.0
Average latency
(ms)
4.17
Maximum (sec)
31
31
31
17