IBM DTTA-351010 Hard Drive Specifications - Page 19

Drive Ready Time

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3.3.2.4 Cylinder Switch Time (Cylinder Skew) Cylinder Switch Time (Typical) Figure 7. Cylinder Switch Time DTTA-35xxxx 3.4 msec DTTA-37xxxx 2.6 msec A cylinder switch time is defined as the amount of time required by the fixed disk to complete seek the next sequential block after reading the last track in the current cylinder. The measurement method is given in 3.3.5, "Throughput" on page 13. 3.3.2.5 Single Track Seek Time (Without Command Overhead, Including Settling) Function Read Write Figure 8. Single Track Seek Time Typical 1.7 msec 2.2 msec Max 2.4 msec 2.9 msec Single track seek is measured as the average of one (1) single track seek from every track with a random head switch in both direction (inward and outward). 3.3.2.6 Average Latency Model DTTA-35xxxx DTTA-37xxxx Figure 9. Latency Time 3.3.3 Drive Ready Time Time for a revolution 11.1 msec 8.3 msec Average Latency 5.56 msec 4.17 msec DTTA-35xxxx DTTA-37xxxx Power On to Ready Figure 10. Drive Ready Time 13 sec (typical) / 31 sec (max) 18 sec (typical) / 31 sec (max) Ready The condition in which the drive is able to perform a media access command (e.g. read, write) immediately. Power On This includes the time required for the internal self diagnostics. Note: Max Power On to ready Time is the maximum time period Device 0 waits up to for Device 1 to assert -PDIAG. Drive Characteristics 11

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3.3.2.4
Cylinder Switch Time (Cylinder Skew)
Figure 7. Cylinder Switch Time
A cylinder switch time is defined as the amount of time required by the fixed disk to complete seek the next
sequential block after reading the last track in the current cylinder.
The measurement method is given in 3.3.5, “Throughput” on page 13.
3.3.2.5
Single Track Seek Time (Without Command Overhead, Including Settling)
Figure 8. 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 direction (inward and outward).
3.3.2.6
Average Latency
Figure 9. Latency Time
3.3.3
Drive Ready Time
Figure 10. Drive Ready Time
Ready
The condition in which the drive is able to perform a media access command (e.g.
read, write) immediately.
Power On
This includes the time required for the internal self diagnostics.
Note:
Max Power On to ready Time is the maximum time period Device 0 waits up to for
Device 1 to assert -PDIAG.
DTTA-35xxxx
DTTA-37xxxx
Cylinder Switch Time (Typical)
3.4 msec
2.6 msec
Function
Typical
Max
Read
1.7 msec
2.4 msec
Write
2.2 msec
2.9 msec
Model
Time for a revolution
Average Latency
DTTA-35xxxx
11.1 msec
5.56 msec
DTTA-37xxxx
8.3 msec
4.17 msec
DTTA-35xxxx
DTTA-37xxxx
Power On to Ready
13 sec (typical) / 31 sec (max)
18 sec (typical) / 31 sec (max)
Drive Characteristics
11