TAPE UNIT SCSI COMMANDS M2488 PRODUCT GUIDE
4-58 CG00000-011503 REV. A April 1997
Table 4-54. MODE SENSE Data Header Field Description
BYTE BIT VALUE DESCRIPTION
0 0-7 The MODE SENSE data length specifies the length in bytes, after the data
length field, that are available to be transferred during the DATA IN phase.
The sense data length does not include itself.
2 0-3 0h The code value for the Speed field is set to 0h (default).
2 4-6 The Buffered Modes are described in Table 4-55.
2 7 0
1
A Write Protected (WP) bit of zero indicates the medium is write enabled.
A WP bit of one indicates the medium is write protected.
3 0-7 08h
00h
The block descriptor length specifies a length of eight if a block descriptor
is included.
A block descriptor length of zero indicates no block descriptors are
included in the parameter list. This condition is not considered an error.
The block descriptor length does not include the length of the pages.
Table 4-55. Buffered Mode Description
BUFFERED
MODE
DESCRIPTION
0h
Target does not report a GOOD status on WRITE commands until the data blocks are actually written
on the medium.
1h
The Target may report GOOD status on WRITE commands as soon as all of the data specified in the
WRITE command has been transferred to the buffer. Write data from multiple initiators can reside in
the buffer prior to writing the data to the medium (default).
2h
The Target may report GOOD status on WRITE commands as soon as all of the write data has suc-
cessfully transferred to the target’s buffer from any one initiator prior to writing the block(s) to the
medium. If an initiator issued a WRITE command while the buffer contains write data from a different
initiator, the target writes any buffered data to the medium prior to accepting any data from the new
initiator.
3h -7h Reserved
