5.35REZERO UNIT Command (01h)

The REZERO UNIT command sends the heads to cylinder 0 (Logical Block Address 0). Once the heads are on the track, they are not guaranteed to stay at cylinder 0; periodic calibrations may send them to a different cylinder. If periodic calibrations have been disabled by using the MAN bit (byte 3, bit 6) of the Vendor Unique Function Control Page in the MODE SELECT command (15h), the REZERO UNIT command will cause the drive to perform the next scheduled calibration. The data format is shown in Table 5-188.

Table 5-188REZERO UNIT Command Descriptor Block-Data Format

Bit

7

6

5

4

 

3

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

Operation

Code (01h)

 

 

 

 

 

 

 

 

 

 

 

 

1 - 4

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

 

Control

 

 

 

 

 

 

 

 

 

 

 

 

 

5-138 Maxtor Atlas 10K V

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Maxtor 10K V manual Rezero Unit Command 01h, 188REZERO Unit Command Descriptor Block-Data Format