IBM DTCA-24090 Hard Drive Specifications - Page 19

Single Track Seek Time

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The seek time is measured from the start of motion of the actuator to the start of a reliable read or write operation. Reliable read or write implies that error correction/recovery is not employed to correct for arrival problems. The Average Seek Time is measured as the weighted average of all possible seek combinations. Weighted Average = max SUM (max + 1 n) (Tn.in + Tn.out) n=1 (max + 1) (max) Where: max = Maximum Seek Length n = Seek Length ( 1 to max ) Tn.in = Inward measured seek time for a n track seek Tn.out = Outward measured seek time for a n track seek 3.3.3 Single Track Seek Time Function READ Write Figure 7. Single Track Seek Time Typical 4 msec 4 msec Max 5.5 msec 6.5 msec Single track seek is measured as the average of one (1) single track seek from every track in both directions (inward and outward). Drive Characteristics 11

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The seek time is measured from the start of motion of the actuator to the start of
a reliable read or write
operation
.
Reliable read or write implies that error correction/recovery is not employed to correct for arrival
problems.
The Average Seek Time is measured as the weighted average of all possible seek combinations.
max
SUM (max + 1
n) (Tn.in + Tn.out)
n=1
Weighted Average =
(max + 1) (max)
Where:
max
= Maximum Seek Length
n
= Seek Length ( 1 to max )
Tn.in
= Inward measured seek time for a n track seek
Tn.out = Outward measured seek time for a n track seek
3.3.3
Single Track Seek Time
Figure 7. Single Track Seek Time
Single track seek is measured as the average of one (1) single track seek from every track in both directions
(inward and outward).
Function
Typical
Max
READ
4 msec
5.5 msec
Write
4 msec
6.5 msec
Drive Characteristics
11