Rezero Unit Command; Format Unit Command - Seagate ST11200 Product Manual

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5.2.1.1 Rezero Unit Command (01h)
Bit 7
Byte(s)
0 0
1 Logical Unit No.
0
2 0
3 0
4 0
5 0
The Rezero Unit command (Table 5.2.1-2) requests that the disc drive set its logical block address to zero
and return the disc drive read/write heads to the track (or cylinder) containing Logical Block Zero. This
command is intended for systems which disable retries and the initiator performs error recovery. It is longer
than a seek to Logical Block Address zero and should be utilized if seek errors are encountered.
For systems that support disconnection, the disc drive disconnects when this command is received.
A Rezero Command also causes a thermal compensation to occur and resets the thermal compensation
cycle timer back to its start, thus allowing the host to know when to expect the next thermal compensation to
occur. The host can thus prevent critical data transfer operations from being interrupted at an undesirable
time.
For drives that support saved log parameters, the Rezero Unit command will also save log counters to the
media and reset the log save timer back to its start.
Notes.
[1] The LUN must be zero.
[2] See "Control Byte" paragraph 4.2.6.
5.2.1.2 Format Unit Command (04h)
Bit 7
Byte(s)
0 0
1 Logical Unit No. [2]
0
2 0
3
4
5 0
Product Manual - Disc Drive SCSI-2/SCSI-3 Interface (Vol. 2; Ver. 2), Rev. E
Table 5.2.1-2. Rezero Unit command
6 5
0 0
0 0 [1]
0 0
0 0
0 0
0 0
Table 5.2.1-3. Format Unit Comman
6 5
0 0
0 0
0 0
INTERLEAVE [3]
0 0
4 3
0 0
0 0
0 0
0 0
0 0
0 0
4 3
0 0
FMT [2] CMP [2]
DATA LST
0 0
0 0
2 1
0 0
0 0
0 0
0 0
0 0
0 Flag Link [2]
2 1
1 0
Defect List Format
[2]
0 0
0 Flag Link [4]
0
1
0
0
0
0
0
0
0