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Command Specifications
4.3 Format Commands
4.3.1 FORMAT UNIT (04)
Bit
Byte
0
1
2
3
4
5
This command initializes (formats) the entire area of the disk media that can be
accessed from the INIT (User Space). At the same time, the IDD also implements
defect management processing, allocating alternate blocks for defective portions
of the disk media in accordance with the specifications in this command.
Furthermore, when the disk media is initialized with any of the following format
attributes changed, the INIT must issue the MODE SELECT or MODE SELECT
EXTENDED command before issuing this command and specify those format
attributes in advance.
•
Logical data block length
•
Logical data block count
•
User space cylinder count
•
Spare sector count for alternate blocks
4-146
7
6
5
0
0
0
FmtData CmpLst
0
0
0
Interleave factor (MSB)
Interleave factor (LSB)
0
0
0
4
3
2
X'04'
Defect List Format
0
0
0
0
0
0
1
0
0
0
0
0
C141-C009
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