Mode Parameter Header for Mode Select (6)
For the tape library, the Mode Pages for the Mode Select (6) command are preceded by a 4-byte Mode Parameter Header. There is one copy of this header for each initiator.
| Byte | Bit 7 | Bit 6 | Bit 5 | Bit 4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
|---|---|---|---|---|---|---|---|---|
| 0 | Mode Data Length (X'00') | |||||||
| 1 | Medium Type (X'00') | |||||||
| 2 | Device-Specific Parameter (X'00') | |||||||
| 3 | Block Descriptor Length (X'00') | |||||||
- Mode Data Length: Reserved when used with the Mode Select (6) command. (When used with the Mode Sense commands, this field specifies the length (in bytes) of the following data that is available to be transferred. The length field does not include itself.)
- Medium Type: Reserved on Medium Changer Devices.
- Device-Specific Parameter: Reserved on Medium Changer Devices.
- Block Descriptor Length: Not used on the tape library.