Request Sense (03); Table 140. Request Sense (03) - Hitachi HUS151473VL3800 - Ultrastar 73.4 GB Hard Drive Specifications

17.28 REQUEST SENSE (03)

Table 140: REQUEST SENSE (03)
Byte
7
0
1 Reserved = 0
2-3
4
5 VU = 0
The REQUEST SENSE command requests the drive to transfer sense data.
The sense data shall be available under the following conditions:
• The previous command to the specified I_T_L
tion (e.g. medium position) is available in any fields.
• The previous command to the specified I_T_L nexus ended unexpected BUS FREE error.
If REQUEST SENSE command with an invalid LUN is received, the drive returns Good status and reports a sense key of Ille-
gal Request and an additional sense code of Logical Unit Not Supported.
If the drive has no sense data available to return, it shall return a sense key of No Sense and an additional sense code of No
Additional Sense Information.
The sense data shall be preserved by the drive for the Initiator until retrieved by the REQUEST SENSE command or until any
other command for the same I_T_L nexus. Sense data shall be cleared upon receiving a subsequent command including
REQUEST SENSE to the same I_T_L nexus.
Separate sense data is maintained by the device for each Initiator. Therefore, there is no requirement for an Initiator to expedi-
tiously clear a Check Condition as this will not affect other initiators in a multi-Initiator system.
The drive will return the number of bytes in the allocation length or 32 bytes, whichever is less.
The contents of the sense data are defined in Section 21.1 "SCSI Sense Data Format" on page 295.
1.A nexus which exists between an initiator, a target, and a logical unit.
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6 5 4
Command Code = 03h
Reserved = 0
Allocation Length
Reserved = 0
1
Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
Bit
3 2
Reserved = 0
nexus terminated with Check Condition status. Any other informa-
180
1 0
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