IBM DTTA-350320, Технические характеристики

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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
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