SCSI Commands
Quantum DLT 8000 Tape System
5-87
MODE SELECT Command (6) / (10) (15h) / (55h) (continued)
Table 5–43 Data Compression Page Descriptor — Field Descriptions
Field Name
Description
Page Code
The Page Code identifies the type of MODE SELECT page being
transferred. A value of 0Fh identifies this as the Data Compression
page.
Page Length
The Page Length field indicates the number of bytes in the Data
Compression page that follow this byte. The valid value for this byte
is 0Eh.
DCE
Data Compression Enable. This bit specifies whether the tape drive
should enable or disable data compression. When set to 1, the drive
starts in compressed format.
DCC
Data Compression Capable. This bit is used by the MODE SENSE
command to indicate that the tape drive supports data compression.
DDE
Data Decompression Enable. Must be set to 1. When the tape drive
reads compressed data from tape, it automatically decompresses the
data before sending it to the initiator. Data compression must always
be enabled.
RED
Report Exception on Decompression. The tape drive does not report
exceptions on decompression (boundaries between compressed and
uncompressed data). The RED field must be 00h.
Compression Algorithm
The Compression Algorithm field indicates which compression
algorithm the tape drive will use to process data from the initiator
when the DCE bit (byte 02, bit 7) is set to 1. The only value currently
supported for this field is 10h.
NOTE:
Specifying a value other than 10h for this field causes the
tape drive to return CHECK CONDITION status, sense key set
to ILLEGAL REQUEST. However, if EEPROM parameter
EnaRepDecomp is set, the parameter in this field is ignored
and no CHECK CONDITION status is returned.
Decompression Algorithm
The Decompression Algorithm field indicates which decompression
algorithm the tape drive will use when decompressing data on the
tape. The only value currently supported is 10h.
NOTE:
Specifying a value other than 10h for this field causes the
tape drive to return CHECK CONDITION status, sense key set
to ILLEGAL REQUEST.
Summary of Contents for DLTtape DLT 8000
Page 1: ...DLTTM 8000 Tape System Product Manual Nov 10 2003 81 60118 06...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued...
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Page 26: ...Table of Contents xxiv Quantum DLT 8000 Tape System...
Page 36: ...About This Manual Quantum DLT 8000 Tape System xxxii...
Page 54: ...General Description and Specifications 1 18 Quantum DLT 8000 Tape System...
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Page 376: ...Appendix A Definition of Vendor Unique Sense Data Information A 4 Quantum DLT 8000 Tape System...
Page 386: ...Appendix C Updating the Firmware C 6 Quantum DLT 8000 Tape System...
Page 396: ...Appendix E Visual Inspection Procedure for DLTtape Cartridges E 8 Quantum DLT 8000 Tape System...
Page 406: ...Appendix G DLT 7000 Emulation Feature G 8 Quantum DLT 8000 Tape System...
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