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> 30-80 percent of SSDs develop at least one bad block and 2-7 percent develop at least one bad chip in the first four years of deployment. Did he perhaps mean
by ntaylor 11y ago
> 30-80 percent of SSDs develop at least one bad block and 2-7 percent develop at least one bad chip in the first four years of deployment.
Did he perhaps mean 3-8 percent?
- eru 11y agoAren't bad blocks pretty common?
- torinmr 11y agoIt is in fact 30-80%: see page 11 of the PDF: http://0b4af6cdc2f0c5998459-c0245c5c937c5dedcca3f1764ecc9b2f.r43.cf2.rackcdn.com/23105-fast16-papers-schroeder.pdf http://0b4af6cdc2f0c5998459-c0245c5c937c5dedcca3f1764ecc9b2f...
- pkaye 11y agoNo, almost every NAND chip will have bad blocks. The initial ones are discarded during drive initialization in the factory. Then they ideally do some burn-in which may catch a few more bad blocks. Then over the life of the drive you may see thousands of defective blocks depending of capacity and number of NAND dies. However the drive can be designed and tested to tolerate to a expected defect limit with no data loss. Now if there is a bad chip, that can also be handled but the recovery process can be high stress on the SSD like in RAID recovery.