Seagate Medalist 2160WC (ST52160WC) Manual descarregar pdf (Página 17)

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.

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.

Power is applied to the disc drive.

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.

2 4

200

400

600

800

1,000



1,200

Time (seconds)

Current (mA)



Figure 1. Typical startup current profile

Medalist Pro 2160N/ 2160WC Product Manual, Rev. A 7

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Seagate Medalist 2160WC (ST52160WC) Manual Página 17