Unrecovered Bit Error Rate (UBER). A metric for storage reliability. It is the average ratio of correctly read bits to incorrect bits delivered by a storage device. UBER reflects all hardware error correction, but does not include additional error detection/correction that might be provided in software or hardware using the device. For devices with removable media the Unrecovered Read Bit Error Rate on standard test media is sometimes used. Typical values of UBER might run up from about 1 bit in a million to very high values e.g. 1 bit in 10^17 for DLT Tape.

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