How drive reliability is measured and the MTBF of WD drives

We no longer measure the reliability of our hard drives using Mean Time Between Failure (MTBF). Our current drive reliability is measured using Component Design Life (CDL) and Annualized Failure Rate (AFR). The Component Design Life of the drive is 5 years and the Annualized Failure Rate is less than 0.8%.

WD Solid State drives are measured using the older MTBF system.

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