Datasheet

conditions. (See Section 7.1, “Environment” on page 21. See also Section 7.2, “DC Power Requirements”
on page 23.)
The seek time is period of time from the start of the motion of the actuator to the start of a reliable read or
write operation. A reliable read or write implies that error correction/recovery is not employed to correct
arrival problems. The Average Seek Time is a measure of 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 an n track seek
Tn
out
= Outward measured seek time for an n track seek
4.3.2.2 Full Stroke Seek Time
21.020.0Write
20.019.0Read
Maximum (ms)Typical (ms)Function
Figure 5. Full stroke seek time
Full stroke seek is measured as the average of 1000 full stroke seeks.
4.3.2.3 Single Track Seek Time (without Command Overhead, including settling)
4.03.0
Write
3.02.0
Read
Maximum (ms)Typical (ms)Function
Figure 6. Single track seek time
Single track seek time is an average. The single track seek time is calculated by adding the time of
inward and outward seek time of each single track and dividing that sum by the total number of tracks.
4.3.2.4 Average latency
8.316.73600
Average latency
(ms)
Time for a revolution
(ms)
Rotation speed
(RPM)
Figure 7. Latency Time
Hard disk drive specification for DSCM-11000/-10512/-10340
13