IBM DDRS-39130 - Ultrastar 9.1 GB Hard Drive, Specifications

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3.4.2.2 Full Stroke Seek
Full stroke seek is measured as the average of 1000 full stroke seeks with a random head switch from both
directions (inward and outward).
3.4.2.3 Cylinder Switch Time (Cylinder Skew)
A cylinder switch time is defined as the amount of time required by the fixed disk access the next sequential
block after reading the last sector in the current cylinder.
The measured method is given in 3.4.7, “Throughput” on page 15.
3.4.2.4 Head Switch Time (Head Skew)
3.4.2.5 Average Latency
Figure 5. Full Stroke Seek Time
Function Typical Max.
Read [ msec] 15.0 16.0
Write [ msec] 15.8 16.8
Figure 6. Cylinder Skew
Typical
Cylinder Skew 2.6 [ msec]
Figure 7. Head Skew
Typical
Head Skew 1.6 [ msec]
Figure 8. Latency Time
Rotation Time for a revolution Average Latency
7200 [ R P M ] 8.33 [ msec] 4.17 [ msec]
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O E M Spec. of DDRS-3xxxx