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Fujitsu Limited has transferred its hard disk drive (HDD) business to Toshiba Corporation on October 1st, 2009. Fujitsu drive initializes itself at power-up as follows:
1. Power-up.

2. Self-diagnostics 1:

– data bus and MPU address test
– writing/reading test of microcircuit registers via internal data bus
– internal RAM writing/reading test.

3. Spindle motor start-up.

4. Self-diagnostics 2:
– buffer RAM writing/reading test.

5. Stabilizing the spindle motor rotation speed.

6. Heads release from latch (magnetic heads’ unparking).

7. Service data reading.

8. Recalibration start.

9. Setting itself in readiness mode (ATA command waiting).

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