Deskstar 7K500 and Deskstar E7K500 Hard Disk Drive Specification
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4.4.2.3 Head switch time (head skew)
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
4.4.2.4 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 read-
ing the last sector in the current cylinder.
The measuring method is given in Section 4.4.5, “Throughput” on page 18.
4.4.2.5 Single track seek time (without command overhead, including settling)
Single track seek is measured as the average of one (1) single track seek from every track in both directions (inward and out-
ward).
4.4.2.6 Average latency
4.4.3 Drive ready time
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.
Head switch time-typical (ms) 1.5
Head switch time-typical (ms) 1.5
Table 7: Single Track Seek Time
Function
Typical (ms) Max (ms)
Read 0.8 1.5
Write 1.3 2.0
Read (Quiet Seek mode) 0.8 1.5
Write (Quiet Seek mode) 1.3 2.0
Table 8: Latency Time
Rotational speed
(RPM)
Time for one
revolution (ms)
Average latency
(ms)
7200 RPM 8.3 4.17
Table 9: Drive ready time
Typical (sec)
Maximum (sec)
Power on to ready
20 31
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