Hitachi HTS541680J9AT00 Specifications - Page 18

Single track seek time without command overhead, including settling - problem

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Travelstar 5K160 (PATA) Hard Disk Drive Specification Mechanical positioning 4.4.1.1 Average seek time (including settling) Command Type Typical (ms) Read 11 Write 13 Table 5. Mechanical positioning performance Max. (ms) 14 15 Typical and Max. are defined throughout the performance specification as follows: Typical Max. Average of the drive population tested at nominal environmental and voltage conditions. 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. max ∑ (max+ 1 − n)(Tnin + Tnout) Weighted Average = n=1 (max+ 1)(max) Where: max. n Tnin Tnout = 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 4.4.1.2 Full stroke seek Command Type Read Write Table 6. Full stroke seek time Typical (ms) 20.0 21.0 Max. (ms) 25.0 26.0 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 Typical (ms) 1.0 1.1 Maximum (ms) 2.0 2.2 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 Time for one revolution (ms) 11.1 Average Latency (ms) 5.5 18/188

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Travelstar 5K160 (PATA) Hard Disk Drive Specification
18
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188
Mechanical positioning
4.4.1.1
Average seek time (including settling)
Command Type
Typical (ms)
Max. (ms)
Read
11
14
Write
13
15
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.
)(max)
1
(max
)
)(
1
(max
max
1
+
+
−
+
=
∑
=
n
Tnout
Tnin
n
Average
Weighted
Where:
max.
= maximum seek length
n
= seek length (1-to-max.)
Tnin
= inward measured seek time for an n-track seek
Tnout
= outward measured seek time for an n-track seek
4.4.1.2
Full stroke seek
Command Type
Typical (ms)
Max. (ms)
Read
20.0
25.0
Write
21.0
26.0
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
Typical (ms)
Maximum (ms)
Read
1.0
2.0
Write
1.1
2.2
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)
Time for one revolution (ms)
Average Latency
(ms)
5400
11.1
5.5
Table 8. Latency time