Original: Unrecoverable bit error rate (UBE) This is the rate at which a disk drive will be unable to recover data after application of cyclic redundancy check (CRC) codes and multiple retries.
Simplified: Unrecoverable bit error rate The unrecoverable bit error rate (UBE) tells how long a disk drive will be unable to recover data after using cyclic redundancy check (CRC) codes and multiple retries.