Brian

SSD
Micron/Crucial M550 SSD Review Discussion

4 posts in this topic

Does anyone know what the story is with the published endurance figure for the M550 drives? It's 72TB of data written, but that same figure applies to all capacities of the drive. So for a 128GB drive that equates to 562.5 full drive writes (ignoring write amplification). But for the 1TB drive, 72TB is only 72 drive writes. Is the NAND used in the 1TB model really that bad? :)

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I believe they just rate minimum endurance figures, with some expectation that the models will support more than that in certain scenarios. They just won't warranty anything above that.

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But the equivalent number of flash writes for the 1TB drive, if the 128GB one can handle 72GB, is 576TB. I can't help thinking that specifying a flat write amount across the range is a bit shady, and will be used to void warranty service. The actual endurance (TB written) of larger-capacity drives will be correspondingly higher than the 128GB model.

If you have a 1TB drive which bricks itself due to a firmware bug after 100TB total writes, Crucial would refuse warranty service, even though flash wear-out wouldn't be the cause of failure. (100TB written to the 1TB drive would only wear the flash by ~17% of its "real" endurance, equivalent to 12.5TB written to a 128GB drive.)

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