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Field
Bytes
Bits
EOM bit
2
6
Incorrect
2
5
Length In-
dicator
(ILI)
Sense Key
2
0-3
Informa-
3-6
tion
Additional
7
Sense
Length
Command
8-11
Specific
Additional
12
Sense
Code
Additional
13
Sense
Code
Qualifier
Field Re-
14
placeable
Unit
Codes
SKSV
15
7
C/D
15
6
BPV
15
3
Bit Pointer
15
0-2
Description
1 = A Write or Write File Marks command completed in the early
warning area. If no other error occurred, the Sense Code will be set
to No Sense and the Additional Sense will be set to EOT (0002). If
another error occurred, then the Sense Code and Additional Sense
will reflect that error.
1 = A Read or Verify ended because a block was read from tape
that did not have the block length requested in the command.
This field indicates the status of the last command and provides a
generic error category. See Sense Key Values.
♦ For a Read, Verify or Write with the Fixed flag clear, this field
contains the number of bytes in the command less the number
of bytes actually processed.
♦ For a Read, Verify, or Write with the fixed flag set, or a Space
with the Code set to zero, this field contains the number of
blocks in the command less the number of blocks processed.
Any block partially transferred in a Read or Write command or
partially verified in a Verify command is considered processed
but is not included in the calculation.
♦ For a Write File Marks or Space command, this field contains
the difference between the number of file marks in the command
and the number of file marks processed.
Note that for a Space command, the Information bytes will contain
a negative number in 2s complement form if the Space is in a re-
verse direction.
n-7, indicating the length of the Sense Data.
Always 0, because no commands use this field.
This field provides further detail for the current Sense Key. See
Sense Key Values.
This field provides further detail for the current Additional Sense
Code. See Sense Key Values.
0 = No part of the drive is suspected of failing
1 to n = Identifies a part of the drive that is suspected of causing
the failure.
0 = Bytes 16-17 contain a message code as defined in Message
Codes, below.
1 = Sense Key Specific data in bytes 15-17 is valid and can be
used to determine the first parameter that caused an Illegal Re-
quest sense key (as defined below).
0 = The first error was encountered in the Data-Out Phase.
1 = The first error was encountered in the Command Descriptor
Block.
1 = The Bit Pointer field indicates the bit field in error.
♦ If BPV is set, this field points to the most significant bit of the
field in error.
♦ When a Log Exception is generated, this field indicates the af-
fected page that caused the Log Exception.
LTO SCSI Interface Manual
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