Hitachi HTS721010G9AT00, Specifications

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Travelstar 7K100 Hard Disk Drive Specification
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4.4.2 Mechanical positioning
4.4.2.1 Average seek time (including settling)
“Typical” and “Max” are used throughout this document and are defined 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” on page 21 and Section 6.2, “DC power require-
ments” on page 24 for ranges.)
The seek time is measured from the start of the actuator’s motion to the start of a reliable read or write operation. A
reliable read or write implies that error correction or recovery is not used to correct arrival problems. The average
seek time is measured as the weighted average of all possible seek combinations.
max
Σ
(m + 1 - n)(Tn + Tn)
n=1
Weighted Average = ––––––––––––––––––––––––––––
(max + 1)(max)
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
4.4.2.2 Full stroke seek time
Full stroke seek is measured as the average of 1,000 full stroke seeks.
Table 5: Mechanical positioning performance
Command type Typical (ms) Max (ms)
Read 10 16
Write 11 17
Table 6: Full stroke seek time
Command type Typical (ms) Max (ms)
Read 18 30
Write 19 31