Hitachi ULTRASTAR 15K450 HUS154530VLF400 - Manual (Page 276)

Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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19.37 REZERO UNIT (01)
Table 219: REZERO UNIT (01)
The REZERO UNIT command requests that the Target seek LBA 0.
Byte
Bit
7 6 5 4 3 2 1 0
0 Command Code = 01h
1 Reserved = 0 Reserved = 0
2-4 Reserved = 0
5 VU = 0 Reserved = 0 FLAG LINK