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146 Fibre Channel Interface Manual, Rev. D
Additional Sense Length 10 (Max)
Specifies additional sense bytes are to follow. This is limited to a maximum of 10 (decimal) additional bytes. If the Allocation
Length of the Command Descriptor Block is too small to transfer all of the additional sense bytes, the additional sense
length is not adjusted to reflect the truncation.
Command Specific Data
These four bytes contain data for the command.
EOM (End of Medium)
Always zero (0) for disc drives.
Error Code
70h Current error.
71h Deferred error.
These two error conditions are described in Section 11.5.1.2.
Filemark
Always zero (0) for disc drives.
ILI (Incorrect Length Indicator)
The requested (previous command) block of data did not match the logical block length of the data on the medium.
Information
If the validity bit is one (1), these bytes contain the unsigned logical block address associated with the sense key. Unless
otherwise specified, the Information bytes contain the address of the current logical block. For example, if the sense key is
Medium Error, it is the logical block address of the failure block.
Product Unique Sense Data
Not presently used.
Segment Number
Always zeros.
Sense Key
General error category. These are listed in Table 92. The code given in byte 12 provides additional clarification of errors.
See the Additional Sense Code field definition for related information.
SKSV (Sense Key Specific Valid) and Sense Key Specific
The additional sense bytes field may contain command specific data, peripheral device specific data, or vendor-specific
data that further defines the nature of the Check Condition status. See Section 11.5.1.1.
The Sense Key Specific field is defined by this specification when the value of the SKSV bit is one (1). The definition of this
field is determined by the value of the Sense Key field. This field is reserved for sense keys described in Table 92.
Note. During a format started by a Format Immediate command or a Device Self-test started by a Send Diagnostic com-
mand, bytes 16 and 17 become a progress indicator with values ranging from 0h to FFFFh. Value 0h indicates the opera-
tion just started and FFFFh indicates the operation is complete.
Validity Bit
1 The Information bytes (Bytes 3–6) are valid.
0 The Information bytes (Bytes 3–6) are not valid.
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