SCSI Command Lengths
Originally the most significant 3 bits of a SCSI opcode specified the length of the CDB. However, when variable-length CDBs were created this correspondence was changed, and the entire opcode must be examined to determine the CDB length. The lengths are as follows:
Opcode (hex ) | Length |
---|---|
00h to 1Fh | 6 |
20h to 5Fh | 10 |
60h to 7Dh | reserved |
7Eh | variable (more than 16 bytes) |
7Fh | extended (variable length; may contain one or more CDBs) |
80H to 9Fh | 16 |
A0h to BFh | 12 |
C0h to FFh | vendor specific |
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