Command Processing During Self-Calibration; Read/Write Circuit; Read/Write Preamplifier (Preamp); Table 4.1 Self-Calibration Execution Timechart - Fujitsu MHA2021AT Product Manual

Table 4.1 Self-calibration execution timechart

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2
3
4
5
6
7
8
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4.5.3 Command processing during self-calibration

If the disk drive receives a command execution request from the host while
executing self-calibration according to the timechart, the disk drive terminates
self-calibration and starts executing the command precedingly. In other words, if
a disk read or write service is necessary, the disk drive positions the head to the
track requested by the host, reads or writes data, and restarts calibration.
This enables the host to execute the command without waiting for a long time,
even when the disk drive is performing self-calibration. The command execution
wait time is about maximum 100 ms.

4.6 Read/write Circuit

The read/write circuit consists of the read/write preamplifier (PreAMP), the write
circuit, the read circuit, and the time base generator in the read channel (RDC).
Figure 4.4 is a block diagram of the read/write circuit.

4.6.1 Read/write preamplifier (PreAMP)

One PreAMP is mounted on the FPC. The PreAMP consists of an read
preamplifier and a write current switch and senses a write error. Each channel is
connected to each data head. The head IC switches the heads by the chip select
signals (*CS) and the head select signals. The IC generates a write error sense
C141-E042-01EN
Time elapsed
At power-on
About 5 minutes
About 5 minutes
About 10 minutes
About 10 minutes
About 15 minutes
About 15 minutes
Every about 30
minutes
4.6 Read/write Circuit
Time elapsed
(accumulated)
Initial calibration
About 5 minutes
About 10 minutes
About 20 minutes
About 30 minutes
About 45 minutes
About 60 minutes
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