IBM DTLA-307075 Hard Drive Specifications - Page 26

Drive ready time

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4.4.2.4 Cylinder switch time (Cylinder skew) Cylinder switch time DTLA-305XXX DTLA-307XXX Typical (ms) 2.0 1.7 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 Read Write Typical (ms) DTLA-305XXX DTLA-307XXX 1.3 0.9 1.8 1.4 Max (ms) DTLA-305XXX DTLA-307XXX 2.0 1.6 2.5 2.1 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 Time for a revolution (ms) 11.1 8.3 Average latency (ms) 5.56 4.17 Figure 10. Latency Time 4.4.3 Drive ready time Power on to ready DTLA-305XXX DTLA-307015/20/30/45 DTLA-307060/75 Typical (sec) 8 12 14 Maximum (sec) 31 31 31 Figure 11. 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 that Device 0 waits for Device 1 to assert PDIAG-. Deskstar 40GV & 75GXP hard disk drive specifications 14

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4.4.2.4
Cylinder switch time (Cylinder skew)
1.7
DTLA-307XXX
2.0
DTLA-305XXX
Typical
(ms)
Cylinder switch time
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)
2.1
2.5
1.4
1.8
Write
1.6
2.0
0.9
1.3
Read
DTLA-307XXX
DTLA-305XXX
DTLA-307XXX
DTLA-305XXX
Max
(ms)
Typical
(ms)
Function
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
4.17
8.3
DTLA-307XXX
5.56
11.1
DTLA-305XXX
Average latency
(ms)
Time for a revolution
(ms)
Average latency
Figure 10. Latency Time
4.4.3 Drive ready time
31
14
DTLA-307060/75
31
12
DTLA-307015/20/30/45
31
8
DTLA-305XXX
Maximum
(sec)
Typical
(sec)
Power on to ready
Figure 11. 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 that Device 0 waits for Device 1 to assert
PDIAG–.
Deskstar 40GV & 75GXP hard disk drive specifications
14