Quantum DLT 4000 Product Manual page 245

DCE (Data Compression Enable)
value returned for this bit depends on the current write density of the DLT4000 drive
as follows:
1 - Data compression is enabled.
DCC (Data Compression Capable)
compression as follows:
0 - The device does not support data compressi
1 - The device supports data compression and will process any data sent to it by
the initiator according to the setting of the DCE bit (byte 02, bit 7)
returned for this bit is 1.
DDE (Data Decompression Enable)
or disabled as follows:
0 - Data decompression is disabled.
When the DLT4000 drive reads compressed data from tape, it automatically
decompresses the data before sending it to the initiator. Therefore, the value returned
RED (Report Exception on Decompression)
The DLT4000 drive does not report exceptions on decompression (boundaries between
Compression Algorithm
The value returned for the Compression Algorithm field is 10h. This indicates
Decompression Algorithm
The value returned for the Decompression Algorithm field is 10h. This indicates
parameter EnaRepDCcomp is set, zero value will be reported if the last block read is
not decompressed.
DLT4000 SCSI Interface
8 85