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A comment on SSD Storage: 2018 in review. Parent comment

Re:SSD Storage: 2018 in review by amelius on Tuesday January 15, 2019 @05:09AM (#18910058)
> This is completely opaque to the operating system; as far as it knows its underlying storage works exactly the same (until there are so many bad blocks that the drive can't keep up this convenient deception).

Is there a way for the drive to tell the fs that a block is bad? Or does the drive simply keep a bunch of blocks apart just in case?

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Re:SSD Storage: 2018 in review by wtallis on Tuesday January 15, 2019 @07:42AM (#18910736)
Hard drives and SSDs both keep a pool of spare blocks so that they can remain functional after having to retire some defective blocks from use. This spare pool tends to be much larger for SSDs. Ordinary IO doesn't convey anything about whether a block had to be retired in the process, but there are SMART indicators that track this stuff.
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