HITACHI Deskstar & CinemaStar 7K1000.B & Deskstar E7K1000 Hard Disk Drive specification
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11.29 Recalibrate (1xh)
Command Block Output Registers
Command Block Input Registers
Table 127 Recalibrate Command (1xh)
The Recalibrate command moves the read/write heads from anywhere on the disk to cylinder 0.
If the device cannot reach cylinder 0, T0N (Track 0 Not Found) will be set in the Error Register.