Rezero Unit Command (01H) - Quantum Atlas 10K II 9.2/18.4/36.7/73.4 GB Product Manual

5.37

REZERO 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.
Bit 7
Byte
0
1 - 4
5
Figure 5–94 REZERO UNIT Command Descriptor Block — Data Format
Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
6 5 4
Operation Code (01h)
Reserved
Control
SCSI Description
3 2 1 0
5–197