Table of Contents
Advertisement
REQUEST SENSE
7.17. REQUEST SENSE 03h
Bit
7
Byte
0
1
2
3
4
5
6
7
8
9
10
11
The sense data:
1.
shall be available if an error condition ("Check Condition") had previously been reported to the Host;
2.
shall be available if other information (e.g. medium position) is available in any field.
If the Device has no other 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 Device until retrieved by a REQUEST SENSE command or until the
receipt of any other I/O Command. The Device shall return "Check Condition" status for a REQUEST SENSE
command only to report exception conditions specific to the command itself.
Example: a Device malfunction preventing return of the sense data.
If a recovered error occurs during the execution of the REQUEST SENSE command, the Device shall return the
sense data with "Good" status. If a Device returns "Check Condition" status for a REQUEST SENSE command,
the sense data may be invalid.
Devices shall be capable of returning at least 20 bytes of data in response to a REQUEST SENSE command. If
the allocation length is 20 or greater, and a Device returns less than 20 bytes of data, the Host should assume that
the bytes not transferred would have been zeros had the Device returned those bytes. The host can determine
how much sense data has been returned by examining the allocation length parameter in the CDB and the
additional sense length in the sense data. Devices shall not adjust the additional sense length to reflect truncation
if the allocation length is less than the sense data available.
The sense data format for error codes 70h (current errors) and 71h (deferred errors) are defined in Table 7-56:
Error Codes 70h and 71h Sense Data Format, Request Sense Standard Data. Error code values of 72h to 7Eh are
reserved. Error code 7Fh is for a vendor-specific sense data format. Devices shall implement error code 70h;
implementation of error code 71h is optional. Error code values of 00h to 6Fh are not defined by this Specification
and their use is not recommended.
SONY AIT-2 Turbo drive SDX-560V series Ver.1.0
6
5
4
Operation Code (03h)
Allocation Length
7. ATAPI Packet Command Specification
3
2
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
1
0
7-53
Advertisement
Table of Contents
