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Command Specifications
224 C141-C013
4.3 Format Commands
4.3.1 FORMAT UNIT (04)
Bit
Byte
7 6 5 4 3 2 1 0
0 X'04'
1 0 0 0
FmtData CmpLst
Defect List Format
2 0 0 0 0 0 0 0 0
3
× × × × × × × ×
4
× × × × × × × ×
5 0 0 0 0 0 0 0 0
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 HDD 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