What does "Unhandled sense code" mean in /var/log/messages?

Solution In Progress - Updated -

Issue

  • getting the following in /var/log/messages, or similar:
sd 0:0:0:7: [sdN] Unhandled sense code
sd 0:0:0:7: [sdN] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
sd 0:0:0:7: [sdN] Sense Key : Medium Error [current]
sd 0:0:0:7: [sdN] Add. Sense: Unrecovered read error
sd 0:0:0:7: [sdN] CDB: Read(10): 28 00 00 00 00 20 00 01 00 00

  • what does "unhandled" mean in this context?

Environment

  • Red Hat Enterprise Linux 5, 6

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