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6.Command Specification
Bit
7
Byte
0
Valid
1
2
File-mark
3
(MSB)
6
7
8
(MSB)
11
12
13
14
15
SKSV
17
18
19
(MSB)
21
22
(MSB)
25
26
27
Valid: A valid bit of one indicates that the Information Bytes hold residual data as defined in the SCSI spec.
Error Code: A value of 70h indicates a current error, i.e. the report is associated with the most recently received
command. A value of 71h indicates a deferred error, i.e. the report is associated with a previous command and is not
as a result of the current command. No other values will be returned.
Segment Number: Contains the number of the current segment descriptor if the REQUEST SENSE command is in
response to a COPY command. Otherwise this byte is ZERO.
File-mark: This bit indicates that the current command has read a File-mark or a Set-mark. Reporting of Set-marks
is optional and indicated by the RSmk bit in the MODE SENSE/SELECT Device Configuration Parameter page.
EOM: An End-Of-Medium (EOM) bit of ONE indicates that an End-Of-Medium condition exists. This bit, when set,
indicates that the drive is at or past the Logical Early Warning Point if the direction was forward, or that the command
could not be completed because Beginning-Of-Partition was encountered if the direction was reverse. The drive will
also set the Sense Key to NO SENSE and the Additional Sense Code Qualifier to either 04h for Beginning of
Partition or 02h for End of Partition.
For WRITE type operations, the drive will return a CHECK CONDITION on any operation which occurs following
detection of the Early Warning End-of-Partition marker. The EOM and Additional Sense Code fields will be set.
For READ type operations, the drive will not return a CHECK CONDITION until the drive encounters the physical
End-of-Partition.
Note that at PHYSICAL End-of-Partition, a WRITE FILEMARK command will cause the command to terminate with
a CHECK CONDITION and a sense key of VOLUME OVERFLOW.
ILI: This is the Incorrect Length Indicator bit, which indicates that the requested logical block length did not match the
logical block length of the data on the medium. Only READ or VERIFY may cause this bit to be set.
Information Bytes: The conditions of these bytes will contain the differences (residue) of the requested length
minus the actual length in either bytes, blocks, File-marks or Set-marks as determined by the command. (Negative
values are indicated by two's complement notation.) These bytes will be valid for all READ, WRITE, SPACE and
VERIFY commands for which a CHECK CONDITION status has been generated. These bytes will be ZERO for
MODE SELECT/SENSE, INQUIRY, READ BLOCK LIMITS and TEST UNIT READY commands.
6-84
Table 6-70: Error Codes 70h and 71h Sense Data Format
6
5
EOM
ILI
Reserved
Additional Sense Length (14h)
Command-Specific Information
Additional Sense Code
Additional Sense Code Qualifier
Field Replaceable Unit Code
Read/Write Data Error Counter
Reserved
4
3
Error Code (70h or 71h)
Segment Number
Information Bytes
Sense-Key Specific
Reserved
Remaining Tape
CLN
Reserved
SONY AIT-2 Turbo drive SDX-550V series Ver.1.0
REQUEST SENSE
2
1
0
Sense Key
(LSB)
(LSB)
(LSB)
(LSB)
Reserved
MEW
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