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4.4.2.4 Cylinder switch time (Cylinder skew)
56.7 kTPI
54 kTPI
Figure 8. Cylinder switch time
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 4.4.5, "Throughput" on page 17.
4.4.2.5 Single track seek time (without command overhead, including settling)
Function
Read
Write
Read (Quiet Seek mode)
Write (Quiet Seek mode)
Figure 9. Single Track Seek Time
Single track seek is measured as the average of one (1) single track seek from every track with a random
head switch in both directions (inward and outward).
4.4.2.6 Average latency
Rotational speed
7200 RPM
Figure 10. Latency Time
4.4.3 Drive ready time
Power on to ready
20 GB & 40 GB models
60 GB & 80 GB models
100 GB & 120 GB models
Figure 11. Drive ready time
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–.
Cylinder switch time - typical (ms)
Typical (ms)
0.8
1.3
0.8
1.3
Time for a revolution
(ms)
8.3
Typical (sec)
10
9
11
The condition in which the drive is able to perform a media access command
(such as read, write) immediately.
This includes the time required for the internal self diagnostics.
Deskstar 120GXP hard disk drive specifications
2.0
2.5
Max (ms)
1.5
2.0
1.5
2.0
Average latency
(ms)
4.17
Maximum (sec)
31
31
31
15
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