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M2488 PRODUCT GUIDE TAPE UNIT SCSI COMMANDS
April 1997 CG00000-011503 REV. A 4-69
If a DMA transfer (READ, WRITE, READ BUFFER, WRITE BUFFER, OR LOOP WRITE TO
READ) is requested by the host with a transfer length of zero bytes, this is not considered an error.
The command is processed with no data transfer. There is no block ID associated with zero length
records.
4-3.15.2 READ BLOCK LIMITS Sense Keys
One of the following sense keys may be returned if a CHECK CONDITION was indicated:
SENSE KEY CONDITION DESCRIPTION
1h RECOVERED ERROR Recovery was performed when writing buffered data.
3h MEDIUM ERROR 1. Write of buffered data failed due to defective tape.
2. An attempt was made to write 36-track data on 18-track format-
ted medium.
4h HARDWARE ERROR Write of buffered failed due to a hardware error.
5h ILLEGAL REQUEST 1. Reserved bit was set in the CDB of the READ BLOCK LIM-
ITS command
2. Flag bit was set and Link bit was not set.
6h UNIT ATTENTION Indicates the READ BLOCK LIMITS command was not per-
formed due to one of the following:
1. The tape cartridge may have been changed.
2. The target has been reset.
3. The Mode parameters have been changed by another initiator.
4. The version of the microcode has been changed (microcode
downloaded).
5. A cartridge was loaded with a tape length that is too long or too
short.