Product Manual - Disc Drive SCSI-2SCSI-3 Interface (Vol. 2; Ver. 2), Rev. E
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continued from previous page
Notes:
[1] Validity Bit - “1” if the Information Bytes (Bytes 3-6) are valid, “0” if not valid.
[2] Error Code 70h means current error. Code 71h means a deferred error. See paragraph 5.1.1.2.1 for a
description of these two error conditions.
[3] Segment Number - Always Zeros
[4] Filemark - Always “0” for disc drive.
[5] EOM - End of medium indicator. Always “0” for disc drive.
[6] ILI - Incorrect Length Indicator. The requested (previous command) block of data did not match the
logical block length of the data on the medium.
[7] Sense Key - Indicates the general error category. These are listed in Table 5.1.1-5. the code given in byte
12 provides additional clarification of errors. See also note [10] below for related information.
[8] If the validity bit is a 1, the Information 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.
[9] Additional Length - 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 trunca-
tion.
[10] Additional Sense Code and Additional Sense Code Qualifier - Provides additional clarification of errors
whenever Sense Key is valid. Error code definitions are in Table 5.1.1-6. If the condition is not reportable
by the disc drive, the additional Sense Code and Additional Sense Code Qualifier are set to “No Addi-
tional Sense Information (Code 0000)”.
[11] Defined for Seagate internal use only.
[12] [13]
The SKSV bits and sense-key specific bytes are described below.
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.
The sense-key specific field is defined by this specification when the value of the sense-key specific valid
(SKSV) bit is one. The definition of this field is determined by the value of the sense key field. This field is
reserved for sense keys not described in Table 5.1.1-5.
If the sense key field is set to ILLEGAL REQUEST (5H) and the SKSV bit is set to one, the sense-key specific
field is defined as shown in Table 5.1.1-4a. These fields point to illegal parameters in command descriptor
blocks and data parameters sent by the initiator in the DATA OUT phase.
