4.5.2 Mechanical positioning
4.5.2.1 Average seek time (including settling)
1513Write
1412Read
Max. (ms)Typical (ms)Command Type
Figure 7. Mechanical positioning performance
Typical and Max. are defined throughout the performance specification as follows:
Maximum value measured on any one drive over the full range of the environmental and
voltage conditions. (See section 6.1 on Environment and section 6.2 on DC power require-
ments.)
Max.
Average of the drive population tested at nominal environmental and voltage conditions.Typical
The seek time is measured from the start of motion of the actuator to the start of a reliable read or write
operation. A reliable read or write operation implies that error correction/recovery is not employed to cor-
rect arrival problems. The Average Seek Time is measured as the weighted average of all possible seek
combinations.
max.
Σ (max. + 1 – n)(Tn
in
+ Tn
out
)
n=1
Weighted Average =
___________________________________________________
(max. + 1)(Tn
in
+ Tn
out
)
Where: max. = maximum seek length
n = seek length (1-to-max.)
Tn
in
= inward measured seek time for an n-track seek
Tn
out
= outward measured seek time for an n-track seek
4.5.2.2 Full stroke seek
3124.0Write
3023.0Read
Max. (ms)Typical (ms)Command Type
Figure 8. Full stroke seek time
Full stroke seek time in milliseconds is the average time of 1000 full stroke seeks.
Travelstar 33GH/30GT/20GN hard disk drive specifications
14
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