SCSI Request Sense Command - Meaning

Meaning

The special control fields in the sense data have the following meaning:

  • Valid -
    • 0 - INFORMATION field is not defined
    • 1 - INFORMATION field is defined
  • Response Code -
    • 70h - current errors, Fixed Format
    • 71h - deferred errors, Fixed Format
    • 72h - Current error, Descriptor Format
    • 73h - Deferred error, Descriptor Format
  • Segment number - valid only if the current command is COPY, COMPARE, or COPY AND VERIFY
  • Filemark - 1 = the current command has reached a filemark or setmark (sequential-access devices only)
  • EOM - 1 = end-of-medium (sequential-access devices) OR out-of-paper (printers)
  • ILI - incorrect length indicator - 1 = requested logical block length did not match the logical block length of the data on the medium
  • The Sense Key, Additional Sense Code, and Additional Sense Code Qualifier fields are usually considered in aggregate to be a 20 bit field called the Key Code Qualifier (KCQ). A composite value of 00000h indicates no error, all other values describe specific error conditions. See the KCQ article for a complete list.
  • SKSV - Sense Key Specific Valid -
    • 0 - sense key specific data are not SCSI compliant
    • 1 - sense key specific data are SCSI compliant
  • Additional sense bytes - can contain vendor-specific data
    • Bytes 20-21 can be used for a Unit Error Code (UEC)

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