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Chapter 4: SCSI Commands
4-100
July 2004
81-81276-01 Rev A01
4.18.2 Sense Keys
Table 4-60
describes the Sense Keys that accompany SENSE REQUEST data.
SKSV
Sense-Key Specific Valid. When set to1, this bit indicates that the Sense Key
specific fields are valid. The Sense Key specific fields are bytes 15, 16, and 17 of
the Request Sense data.
C/D
When set to1, this bit indicates that the illegal parameter is in the CDB. When set
to 0, this bit indicates that the illegal parameter is in the Parameter List from the
initiator.
BPV
Bit Pointer Valid. When set to1, this bit indicates that the Bit Pointer field is valid
and designates which bit of the byte designated by the field pointer is in error. For
a multi-bit field, it points to the most significant bit of the field.
Field Pointer
Indicates which byte of the CDB or Parameter List was in error. For a multi-byte
field, the most significant byte is indicated.
Internal Status Code
The Internal Status Code is located at byte offset 18 of the request sense data and
may be available after certain types of failures.
Tape Motion Hours
Report the number of medium motion hours, that is, the head wear hours. Format
is represented in a hexadecimal word (2 bytes).
Power On Hours
Report the total hours the tape drive power has been on. Format is represented in a
hexadecimal longword (4 bytes).
Tape Remaining
Report the amount of medium remaining in 8 Kb (8192 bytes) blocks.
Table 4-60.
Supported Sense Keys That Accompany REQUEST SENSE Data
Sense Key
Description
00h
No Sense. Check the Filemark/EOM/ILI bits and the ASC/Q bytes
01h
Recovered Error. Reports rounding of Mode Parameters on a MODE SELECT, or R/W error
rates reaching subsystem specification limits for optimal operation. However, the tape drive
may still be able to continue to function without any unrecovered errors for a long time.
02h
Not Ready. The medium is not ready for tape drive operation commands. Media might not be
present in the tape drive, or may be in process of loading or calibrating.
03h
Medium Error. An unrecoverable write, read, or positioning error occurred. Detailed tape
drive-specific information may be available.
04h
Hardware Error. The Additional Sense Code/Qualifier fields may provide more specific
information.
Table 4-59.
REQUEST SENSE Data — Field Descriptions
(Continued)
Field Name
Description
Summary of Contents for DLTtape DLT1
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Page 16: ...List of Figures xiv July 2004 81 81276 01 Rev A01 Notes...
Page 20: ...List of Tables xviii July 2004 81 81276 01 Rev A01 Notes...
Page 24: ...Chapter 1 Introduction 1 4 July 2004 81 81276 01 Rev A01 Notes...
Page 32: ...Chapter 2 General SCSI Bus Operation 2 8 July 2004 81 81276 01 Rev A01 Notes...
Page 42: ...Chapter 3 SCSI Messages 3 10 July 2004 81 81276 01 Rev A01 Notes...
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