SCSI Commands
Page
101
Field
Bytes
Bits
Description
Field
Pointer
16-17
♦
If BPV is set, this field points to the most significant byte of the
field in error.
♦
When a Log Exception is generated, bytes 16 and 17 indicate
the MSB and LSB of the Log Parameter code that caused the
Log Exception. Byte 15 indicates the affected page that caused
the Log Exception.
♦
For all other errors, this field contains message codes as de-
fined in Message Codes, Appendix A.
CLN
21
3
0 = The drive does not need cleaning.
1 = The drive needs cleaning.
Reserved
All reserved bits are 0.
Sense Key Values
The following table shows the meaning of the Sense Key values. For expanded
information, see Additional Sense Codes and Code Qualifiers, below.
Key
Message
Definition
00h
No Sense
The Check Condition occurred in conjunction with detection of FM, EOT, or
ILI, or status was not available.
01h
Recovered
Error
The Log Sense counter reached its maximum value and the RLEC bit is set.
02h
Not Ready
The drive is not ready to accept tape access commands. Operator interven-
tion may be required to correct this condition, or the drive may be coming
ready.
03h
Medium Er-
ror
The command terminated with a nonrecoverable error that was probably
caused by a flaw in the medium or an error in the recorded data.
04h
Hardware Er-
ror
The drive detected a nonrecoverable hardware failure (parity, etc.) while
performing the command. Until the cartridge is ejected or a reset is received,
the drive continues to return this sense key to any tape motion command.
05h
Illegal Re-
quest
The CDB or command parameters contained an illegal parameter.
06h
Unit Atten-
tion
One of the following actions occurred: the cartridge was changed; the drive
was reset; the operational mode was changed; a Log Exception occurred; or
the firmware was changed.
07h
Data Protect
The cartridge is write-protected; the operation was not performed.
08h
Blank Check
A no-data condition was encountered on the tape, or the wrong data format
was encountered on tape.
09h
Vendor Spe-
cific
Vendor specific conditions.
0Bh
Aborted
Command
The drive aborted the command. This key is returned if a bus parity error is
detected. The Initiator may be able to recover by trying the command again.
ODh
Volume
Overflow
The drive reached the physical EOT, and write data remains in the buffer.
0Eh
Miscompare
The source data did not match the tape data during a VERIFY command.
Additional Sense Codes and Code Qualifiers
Additional Sense Codes and Additional Sense Codes Qualifiers are returned in the
Request Sense data in bytes 12 and 13. These codes are loaded whenever a Check
Condition is returned for a SCSI command. The purpose of the codes is to provide
more specific error information.
