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5-114 Maxtor Atlas 10K V
5.32 REQUEST SENSE Command (03h)
The REQUEST SENSE command causes the drive to transfer detailed sense data to
the initiator. The drive maintains sense data on an individual initiator basis. The data
format and field descriptions are shown in Table 5-166 and Table 5-167 respectively.
Table 5-166 REQUEST SENSE Command Descriptor Block-Data Format
Table 5-167 REQUEST SENSE Command Descriptor Block-Field Description
5.32.1 Sense Data Availability
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.
Bit
Byte
76543210
0 Operation Code (03h)
1 - 3 Reserved
4 Allocation Length
5 Control
Field Description
Allocation Length The drives can return a maximum of 18 bytes of sense data. The initiator should set
this field to the maximum value to receive all the sense data.