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SCSI Commands
5-98
Quantum DLT 4000 Tape Drive
MODE SENSE (6) / (10) Command (1Ah / 5Ah) (continued)
Table 5–47 MODE SENSE Block Descriptor - Field Descriptions
Field Name
Description
Density Code
The contents of this field match the density of the media, or 0 if the density is
unknown:
Density Code
00h
0Ah
16h
17h
18h
19h
1Ah
Description
Use default density.
6667 bpi MFM serial cartridge tape X3B5/86-199 (read only).
10000 bpi MFM serial cartridge tape X3.193-1990 (read only).
42500 bpi MFM serial cartridge tape X3B5/91- 2.6 GB (DLTtape III
only).
Same as 17h, but with 56 track pairs vs. 24 - 6.0 GB (DLTtape III
only).
62500 bpi, 64 track pairs, serial cartridge tape - 10.0 GB (DLTtape
III only) /15.0 GB (DLTtape IIIxt only)
81633 bpi, 64 track pairs, serial cartridge tape - 20.0 GB (DLTtape
IV only)
The density codes above are the
preferred
codes used to define density.
Additionally, the following codes may be used, though use of the Data
Compression Page is preferred (these codes are only returned if they were set using
the MODE SELECT command):
80h
62500 bpi, 64 track pairs, serial cartridge tape - 10.0 GB (DLTtape III)
/15.0 GB (DLTtape IIIxt) without compression
81h
62500 bpi, 64 track pairs, serial cartridge tape - 20.0 GB (DLTtape III)
/30.0 GB (DLTtape IIIxt) with compression
82h
81633 bpi, 64 track pairs, serial cartridge tape - 20.0 GB (DLTtape IV)
without compression
83h
81633 bpi, 64 track pairs, serial cartridge tape - 40 GB (DLTtape IV) with
compression
Number of
Blocks
This field is sent as 0, indicating that all of the remaining logical blocks on the tape
have the medium characteristics specified by the block descriptor.
Block Length
This field specifies the length (in bytes) of each logical block transferred over the
SCSI bus. A block length of 0 indicates that the length is variable (as specified in the
I/O command). Any other value indicates the number of bytes per block that are
used for READ, WRITE, and VERIFY type commands that specify a fixed bit of 1
(fixed block mode).
Summary of Contents for DLTtape DLT 4000
Page 1: ...DLT 4000 Tape Drive Product Manual November 10 2003 81 60043 04 ...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued ...
Page 6: ......
Page 24: ...About This Manual Quantum DLT 4000 Tape Drive xxiv ...
Page 62: ...Hardware Implementation 2 28 Quantum DLT 4000 Tape Drive ...
Page 100: ...Messages 4 12 Quantum DLT 4000 Tape Drive ...
Page 264: ...SCSI Commands 5 164 Quantum DLT 4000 Tape Drive ...
Page 274: ...Appendix B EEPROM Resident Bugcheck and Event Logs B 6 Quantum DLT 4000 Tape System ...
Page 280: ...Appendix C Updating the Firmware C 6 Quantum DLT 4000 Tape Drive ...
Page 298: ...Index Index 6 Quantum DLT4000 Tape Drive ...
Page 299: ......