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Medalist Pro 2160N/ 2160WC Product Manual, Rev. A
1.6
Read look-ahead and caching
The drives use algorithims that improve seek performance by storing
data in a buffer and processing it at a more convenient time. Three
methods are used: read look-ahead, read caching and write caching.
These are described in Appendix C.6 on page 108.
1.7 Start/stop command
If the motor-start option is disabled, the drive is ready within 20 seconds
after power is applied. If the motor-start option is enabled, the drive is
ready within 20 seconds after it receives the Motor Start command. If the
drive receives a command to spin down or power is removed, the drive
stops within 15 seconds.
Current (mA)
1,200
1,000
800
600
400
200
2
4
Figure 1. Typical startup current profile
1.7.1 Power-up sequence
The following typical power-up sequence is provided to assist you in
evaluating drive performance. This information does not constitute a
specification or a performance guarantee.
1. Power is applied to the disc drive.
2. Depending on whether there is a jumper installed on pins 9 and 10 of
the options jumper block (J5) shown in Figure 3 on page 19, either of
the following sequences occurs:
If a jumper is not installed, the remote start option is not enabled, and
the drive begins to spin up as soon as power is applied.
If a jumper is installed, the remote start option is enabled, and the drive
begins to spin up when the host sends a command for the motor to
start.
12
16
6
8
10
14
Time (seconds)
7
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