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3.3 Format Commands
C141-E167
3 - 75
The values specified in the "Logical block address" field and "Block count" field in the CDB are
disregarded and if any unwritten data exist in the data buffer, writing of all those data to the disk
media is performed.
If bit 1 of CDB byte 1, the "Immed (immediate) bit, is "1," a GOOD status is reported immediately at
the point when the legality of the CDB is confirmed and the command is terminated. If this bit is
"0," a GOOD status is reported at the point when writing of the unwritten data in the data buffer is
completed and the command is terminated.
3.3 Format Commands
3.3.1 FORMAT UNIT (04)
Bit
Byte
76543210
0 X‘04’
1 LUN FmtData CmpLst Defect List Format
2 00000000
3 Interleave factor (MSB)
4 Interleave factor (LSB)
5 0000000Link
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