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TBW and DWPD conversion table for SSD endurance ratings
How to convert between TBW (terabytes written) and DWPD (drive writes per day) for an SSD, with a worked table of 60 rows: six capacities from 0.25 to 8 TB, warranty periods of 3 and 5 years, and DWPD ratings of 0.1, 0.3, 1, 3 and 10. The formulas are TBW = DWPD x capacity x 365 x years and DWPD = TBW / (capacity x 365 x years). Pure arithmetic from the public definitions, with no measured data and no product ratings. For example, 1 TB at 1 DWPD over 5 years is 1,825 TBW, and 600 TBW on a 1 TB drive over 5 years is 0.33 DWPD.
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Which models make up the 6+ year AFR buckets, Backblaze Q4 2025
Splits the older power-on age buckets (6 to under 7, 7 to under 8, 8 or more years) of Backblaze's Q4 2025 fleet (October 1 to December 31, 2025) by drive model, from the raw daily Drive Stats files. Sample: hard drives of 3 TB or more with a power-on-hours value; 1,424,836, 226,691 and 1,383,760 drive days in the three buckets, with 101, 44 and 70 failures. In the 7 to under 8 year bucket (7.08% AFR), two models hold 27 plus 13 of the 44 failures: HGST HUH728080ALE600 and Toshiba MG07ACA14TA. Association only, one fleet and one quarter.