Maxtor ATLAS 10K III - Manual (Page 197)

SCSI Description
Maxtor Atlas 10K III 5-133
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Sense data is available if the initiator is responsible for an in-progress FORMAT
UNIT command (Format Progress Indication is available in the Format Progress
Indication Bytes).
The drive returns a sense key of NO SENSE and an additional sense code of NO
ADDITIONAL SENSE INFORMATION if it has no sense data available for the
initiator.
For Parallel SCSI disk drives, sense data is available if the previous command from the
initiator terminated with a CHECK CONDITION status, or if the previous
command from the initiator ended with an unexpected BUS FREE error.REQUEST
Clearing Sense Data
Sense data is cleared from the drive's memory by one of the following conditions:
• After being returned from a REQUEST SENSE command.
• As soon as any other command is received from the initiator except
INQUIRY.