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.
Maximum or Max.
The
maximum value measured on any one drive over the full range of the
environmental and voltage conditions. (See Sections 9.2 "Environment" on page 47 and 9.3
"DC Power Requirements" on page 48.)
The seek time is measured from the start of motion of the actuator until a reliable read
or write operation may be started. Reliable read or write implies that error
correction/recovery is not employed to correct for arrival problems. The Average Seek
Time is measured as 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 a n track seek
Tn
out
= Outward measured seek time for a n track seek
4.3.2.2
Full Stroke Seek (Without Command Overhead, Including Settling)
33.533.5Write (Quiet Seek Mode)
35.532.5Read (Quiet Seek Mode)
18.715.7Write
17.714.7Read
Maximum
(ms)
Typical
(ms)
Function
Figure 5.
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.
4.3.2.3
Head Switch Time (Head Skew)
1.4 msHead Switch Time
T
pical
Figure 6. Head Switch Time
A head switch time is defined as the amount of time required by the fixed disk to complete seek the next
sequential track after reading the last sector in the current track.
The measurement method is given in Section 4.3.6, "Throughput" on page 13.
4.3.2.4 Cylinder Switch Time (Cylinder Skew)
1.8 msCylinder Switch Time (Typical)
Figure 7. Cylinder Switch Time
Deskstar 60 GXP Hard disk drive specification
11
To Next Page
Loading...
