uncorrectable-bit-error-rate · shipping · also UBER, uncorrectable bit error ratio

Uncorrectable bit error rate

Uncorrectable bit error rate is a storage reliability metric that normalizes unrecovered data-error outcomes by a specified bit count after the stated correction and recovery procedures.

Related Observatory article: Uncorrectable bit error rate on hesela.com

State the event unit and denominator: Solidigm's D7-P5810 brief specifies UBER in sectors per bits read. [1] Cai and colleagues instead normalize codeword failure rate by codeword length in their ECC comparison. [2] Neither convention counts every wrong bit in a failed unit. A specification limit is not an observed fleet rate, and does not by itself establish independent, constant-probability errors.

Relations

related

bit-error-rate, raw-bit-error-rate, error-correcting-code, codeword, ldpc, latent-sector-error

Limitations

• A source's counting convention must accompany its UBER value before comparison or use in a reliability model. [1, 2]

Citations

1. Solidigm D7-P5810 product brief, page 3 reliability table and page 4 qualification note. (accessed 2026-10-12)
2. Cai et al. Error Characterization, Mitigation, and Recovery in Flash Memory Based Solid-State Drives (2017), sections II.C and VI.C. (accessed 2026-10-12)
3. Hesela: LDPC in NAND, the read cost of confidence. (accessed 2026-10-12)

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