User Manual

SCSI Commands Reference Manual, Rev. J 46
www.seagate.com General Concepts
2.4 Sense data
2.4.1 Sense data introduction
Sense data shall be returned in the same I_T_L_Q nexus transaction as a CHECK CONDITION status and as parameter data in
response to the REQUEST SENSE command. Sense data returned in the same I_T_L_Q nexus transaction as a CHECK CONDITION
status shall be either fixed or descriptor format sense data format based on the value of the D_SENSE bit in the Control mode
page. The REQUEST SENSE command may be used to request either the fixed format sense data or the descriptor format sense
data.f
The first byte of all sense data contains the RESPONSE CODE field that indicates the error type and format of the sense data (see
table 11).
The RESPONSE CODE field shall be set to 70h in all unit attention sense data in which:
a) The ADDITIONAL SENSE CODE field is set to 29h; or
b) The additional sense code is set to MODE PARAMETERS CHANGED.
Table 11 Sense data response codes
Response
Code
Error type Sense data format
Description Reference Description Reference
00h - 6Fh
Reserved
70h
Current 2.4.1.3 Fixed 2.4.1.2
71h
Deferred 2.4.1.4 Fixed 2.4.1.2
72h
Current 2.4.1.3 Descriptor 2.4.1.1
73h
Deferred 2.4.1.4 Descriptor 2.4.1.1
74h - 7Eh
Reserved
7Fh
Vendor specific