SCSI CDB

In SCSI computer storage, commands are sent in a Command Descriptor Block (CDB).

Each CDB can be a total of 6, 10, 12, or 16 bytes, but later versions of the SCSI standard also allow for variable-length CDBs. The CDB consists of a one byte operation code followed by some command-specific parameters.

A typical CDB structure is:

bit→ ↓byte	7	6	5	4	3	2	1	0
0	Operation code = 03h
1	LUN			Reserved
2	Reserved
3	Reserved
4	Allocation length
5	Control

See also

• LUN

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