Mechanical positioning
4.4.1.1
Average seek time (including settling)
Command Type
Read
Write
Table 5. Mechanical positioning performance
Typical and Max. are defined throughout the performance specification as follows:
Typical
Average of the drive population tested at nominal environmental and voltage conditions.
Max.
Maximum value measured on any one drive over the full range of the environmental and
voltage conditions. (See section 6.1 "Environment" and 6.2 "DC power requirements" on
page 24)
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 correct arrival problems.
The Average Seek Time is measured as the weighted average of all possible seek combinations.
Weighted
Average
Where:
max.
n
Tnin
Tnout
4.4.1.2
Full stroke seek
Command Type
Read
Write
Table 6. Full stroke seek time
Full stroke seek time in milliseconds is the average time of 1000 full stroke seeks.
4.4.1.3
Single track seek time (without command overhead, including settling)
Command Type
Read
Write
Table 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).
4.4.1.4
Average latency
Rotational Speed (RPM)
5400
Table 8. Latency time
Travelstar 5K160 (PATA) Hard Disk Drive Specification
Typical (ms)
11
13
max
∑
+
−
(max
1
n
)(
Tnin
=
=
n
1
+
(max
1
)(max)
= maximum seek length
= seek length (1-to-max.)
= inward measured seek time for an n-track seek
= outward measured seek time for an n-track seek
Typical (ms)
20.0
21.0
Typical (ms)
1.0
1.1
Time for one revolution (ms)
11.1
Max. (ms)
14
15
+
Tnout
)
Max. (ms)
25.0
26.0
Maximum (ms)
2.0
2.2
Average Latency
(ms)
5.5
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