Drive Ready Time; Figure 8. Cylinder Skew; Figure 9. Single Track Seek Time; Figure 10. Latency Time - IBM DTLA-305040 - Deskstar 41.1 GB Hard Drive Specifications

4.4.2.4 Cylinder switch time (Cylinder skew)
Cylinder switch time
DTLA-305XXX
DTLA-307XXX

Figure 8. Cylinder Skew

A cylinder switch time is defined as the amount of time required by the fixed disk to access the next
sequential block after reading the last sector in the current cylinder.
The measuring method is given in 4.4.6, "Throughput" on page 0.
4.4.2.5 Single track seek time (without command overhead, including settling)
Function
DTLA-305XXX
Read
Write

Figure 9. 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).

4.4.2.6 Average latency

Average latency
DTLA-305XXX
DTLA-307XXX

Figure 10. Latency Time

4.4.3 Drive ready time

Power on to ready
DTLA-305XXX
DTLA-307015/20/30/45
DTLA-307060/75

Figure 11. Drive ready time

Ready
Power on
Note: Max Power On to ready time is the maximum time period that Device 0 waits for Device 1 to assert
PDIAG–.
Typical (ms)
DTLA-307XXX
1.3 0.9
1.8 1.4
Time for a revolution
(ms)
11.1
8.3
Typical (sec)
8
12
14
The condition in which the drive is able to perform a media access command
(e.g. read,write) immediately.
This includes the time required for the internal self diagnostics.
Deskstar 40GV & 75GXP hard disk drive specifications
Typical (ms)
2.0
1.7
Max (ms)
DTLA-305XXX DTLA-307XXX
2.0
2.5
Average latency
(ms)
5.56
4.17
Maximum (sec)
31
31
31
14
1.6
2.1