HITACHI Deskstar & CinemaStar P7K500 Hard Disk Drive specification (Rev 1.1)
11
4.5.2
Mechanical positioning
4.5.2.1
Average seek time (without command overhead, including settling)
1D/2D
Command Type
Typical
(ms)
Max
(ms)
Read
14.0
14.7
Write
15.0
15.7
Table 5 Mechanical positioning performance
The terms “Typical” and “Max” are used throughout this specification with the following meanings:
Typical.
The average of the drive population tested at nominal environmental and voltage
conditions.
Max.
The
maximum value measured on any one drive over the full range of the environmental and
voltage conditions. (See Section 6.4, “Environment” on page 41 and Section 6.5, “DC Power
Requirements” on page 43.
Seek time is measured from the start of the 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 used to correct
arrival problems. The average seek time is measured as the weighted average of all possible seek
combinations.
B
max.
B
Σ
(max. + 1 – n) (Tn
B
in
B
+ Tn
B
out
B
)
P
n=1
P
Weighted Average =
P
__________________________________________________
P
(max. + 1) (Tn
B
in
B
+ Tn
B
out
B
)
where:
max
= maximum seek length
n
= seek length (1 to max)
Tn
B
in
B
= inward measured seek time for an n-track seek
Tn
B
out
B
= outward measured seek time for an n-track seek
4.5.2.2
Full stroke seek
(without command overhead, including settling)
1D/2D
Command Type
Typical
(ms)
Max
(ms)
Read
27.0
30.0
Write
28.0
31.0
Table 6 Full stroke seek time
Full stroke seek is measured as the average of 1000 full stroke seeks with a
random head switch
from both
directions (inward and outward).
4.5.2.3
Single track seek time (without command overhead, including settling)
Common to all models and all seek modes
Function
Typical (ms)
Max (ms)
Read
0.8
1.5
Write
1.3
2.0
Table 7 Single Track Seek Time
Single track seek is measured as the average of one (1) single track seek from every track with a random
head switch in both directions (inward and outward).
Содержание 3.5-INCH Deskstar HDP725050GLAT80
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