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Latest paper on MLC vs eMLC vs SLC reliability

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There was a study presented on Google's datacenter SSDs as of late:

Conclusions are interesting:

  • SLC not more reliable than MLC
  • 20-63% of SSDs develop a uncorrectable error in the first 4 years and 30-80% develop at least 1 bad block
  • Drives tend to have few or many bad blocks
  • Replacement rates for SSDs is lower, but their rate of errors is higher

Anyways, the full study is worth reading.

I suppose though that there is no real benefit in keeping SLC.

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Kind of late now as SLC is largely gone, but the results are good reading regardless. Incidentally, SLC was largely intended for endurance as well.

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