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5-116 Maxtor Atlas 10K V
Table 5-169 Sense Data Fields (Error Code 70h)-Field Descriptions
Field Definition
Valid
The Valid bit, when set to 1, indicates that the Information field contains valid information, as defined
below. When set to 0, it indicates that the contents of the Information field are not as defined below.
Error Code
Either 70h, indicating that current errors are to be reported, or 71h, indicating deferred errors are to be
reported.
Segment
Number
This feature is not supported and will return a zero value.
FileMrk The File Mark field is reserved for sequential access devices. This field will return a zero value.
EOM
The End-of-Medium field is reserved for sequential access and printer devices. This field will return a
zero value.
ILI
Incorrect Length Indicator. When this bit is set to 1, it indicates that the requested logical sector length
did not match the logical sector length of the data on the media. This field is only set for incorrect byte
transfer lengths on a READ LONG and WRITE LONG command descriptor block.
Sense Key
The sense key, additional sense code, and additional sense code qualifier provide a hierarchy of infor-
mation. The sense key provides the highest level of information about error and exception conditions.
The additional sense code and qualifier provided more detailed information.
The sense keys supported by the drive are described in Table 5-173.
Information
The Information field contains the following device-type or command-specific information:
1) The unsigned logical sector address associated with the sense key.
2) The difference between the requested length and the actual length in either bytes or sectors, as de-
termined by the command. This difference is called the residue.
3) A description of each of the drive's supported commands definition for this field is contained in Ta-
ble 5-171.
Additional
Sense
Length
The Additional Sense Length field indicates the number of addition sense bytes that can follow. If the
Allocation Block Length specified in the Command Descriptor Block is too small to transfer all of the
additional sense bytes, the Additional Sense Length byte value is not adjusted to reflect the truncation.
Command-
Specific In-
formation
The Command-Specific Information field is valid only for Sense Data for a failed REASSIGN
BLOCKS command. It contains either the Logical Block Address of the first defect descriptor not re-
assigned or, if all the defect descriptors were reassigned, FFFFFFFFh.
Additional
Sense Code
The Additional Sense Code field indicates further information related to the error or exception condi-
tion reported in the sense key. If the drive does not have further related information, the additional
sense key is set to NO ADDITIONAL SENSE INFORMATION. See Table 5-172.
Additional
Sense Code
Qualifier
The Additional Sense Code Qualifier field indicates detailed information related to the additional sense
code. If the drive does not have detailed information, the field is set to 0.
Field Re-
placeable
Unit
The Field Replaceable Unit Code specifies a unit that has failed:
Code FRU
1 Host
2 Hard Disk Assembly (HDA)
3 Printed Circuit Board Assembly (PCBA)
SKSV
Sense-Key Specific Valid bit. This bit is 1 for all sense keys listed in Table 5-170 (exception: NOT
READY and UNIT ATTENTION/RPL Status Change). The SKSV bit and Sense-Key Specific bytes
may be 0 when the sense key is NOT READY.
Sense-Key
Specific
The contents of the Sense-Key Specific field are unique to each sense key. Table 5-171 summarizes
the sense keys for which the drive supplies sense-key specific information. (See SKSV.)