IBM IC35L040AVVN07-0 Hard Drive Specifications - Page 29

Drive ready time

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4.4.2.4 Cylinder switch time (Cylinder skew) 56.7 kTPI 54 kTPI Cylinder switch time - typical (ms) 2.0 2.5 Figure 8. Cylinder switch time 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 4.4.5, "Throughput" on page 17. 4.4.2.5 Single track seek time (without command overhead, including settling) Function Read Write Read (Quiet Seek mode) Write (Quiet Seek mode) Typical (ms) 0.8 1.3 0.8 1.3 Max (ms) 1.5 2.0 1.5 2.0 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 Rotational speed 7200 RPM Time for a revolution (ms) 8.3 Figure 10. Latency Time 4.4.3 Drive ready time Average latency (ms) 4.17 Power on to ready 20 GB & 40 GB models 60 GB & 80 GB models 100 GB & 120 GB models Typical (sec) 10 9 11 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 (such as 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 120GXP hard disk drive specifications 15

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4.4.2.4
Cylinder switch time (Cylinder skew)
2.5
54 kTPI
2.0
56.7 kTPI
Cylinder switch time - typical
(ms)
Figure 8. Cylinder switch time
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 4.4.5, “Throughput” on page 17.
4.4.2.5
Single track seek time (without command overhead, including settling)
2.0
1.3
Write (Quiet Seek mode)
1.5
0.8
Read (Quiet Seek mode)
2.0
1.3
Write
1.5
0.8
Read
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
7200 RPM
Average latency
(ms)
Time for a revolution
(ms)
Rotational speed
Figure 10. Latency Time
4.4.3 Drive ready time
31
11
100 GB & 120 GB models
31
9
60 GB & 80 GB models
31
10
20 GB & 40 GB models
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
(such as 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 120GXP hard disk drive specifications
15