When a bit fails in a consumer grade SSD drive it and its associated sectors entire page is useless. Unlike what happens in top end enterprise SSD drives that do include full error detection and ECC error correction.
meaning when a saved bits signal degrades through component failure or simply time there is no way for the SSD drives firmware to regenerate the data and maintain data integrity. Trying 2 b Helpful, In addition consumer grade SSD drives do not include any error correction data with each sector to allow degraded data to be regenerated like we have with magnetic and optical storage. It also improves the chances of lost file recovery if files are not fragmented and one uses deep scan mode on corrupted file systems or accidentally formatted hard drives in both SSD and magnetic drives. I have read but not confirmed that some SSD drives don't even include basic firmware CRC checking on sector data, to maximise user quotable bytes, so can vomit out incorrect sector data without even telling the operating system an error has Since the seek time on modern magnetic hard drives is still limited by the physical movement times of the head across the surface and the rotation time of the platters and neither have significantly improved, along with the significant increases in total capacity, the need to defragment magnetic media still remains.
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