This pdf from Micron goes into specific detail: So any data that still remains will disappear over time (probably within a few hours of the SSD sitting idle).įor those that actually want to read up on the functionality of Secure Erase/Sanitize Data command functionality.(it is *not* simply a quick delete or quick format equivalent where the data is left intact for recovery.)Īctually, that link doesn't really say much, except for being an ad for the AOMEI partition tool. It probably also set all the sectors as safe to erase, so the SSD will gradually erase them during idle time (destroying any data they contained). But putting the hundreds of millions of sectors back in the proper order would be like trying to solve a jigsaw puzzle with hundreds of millions of identically-shaped pieces (only difference is the image on each piece). You could in theory recover data from it. Resetting the virtual sector table has the effect of completely scrambling all data on the SSD. In that way, the SSD can make sure all NAND cells get roughly the same amount of writes (their wear is leveled). So now every time your computer tries to access sector #12345, it gets sent to the physical sector which used to be #24680 instead of the physical sector which used to be #12345. Then it swaps the entries for the two in the virtual file table. What it does is copy sector #24680 holding the stagnant data to the overused sector #12345. it's holding a movie file which you never erase). If the SSD detects that sector #12345 is getting unusually high number of writes, it will swap it with a sector that isn't being used much (e.g. Its purpose is to allow the wear leveling algorithm to function. There's a separate table which maps from the virtual sectors to the physical sectors on the SSD. The sectors your computer sees on a SSD do not correspond to an exact physical location like on a HDD. If this Sanitize Drive option only took a few seconds, it's probably just wiping the virtual sector table. Erasing NAND is slow, like HDD-slow, which is why SSDs are designed to do it in the background during idle time (which is why TRIM was important - that's how the OS tells the SSD which cells are safe to erase). A true erase of a SSD should take a long time.
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