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this post was submitted on 29 May 2024
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No Stupid Questions
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It's worth mentioning that the OS index is what gets deleted when a file is deleted, the SSD is untouched by this, but SecureErase is a special command sent to the SSD controller inside the unit that deletes its own index of what entries correspond to which 1s and 0s on which separate internal NAND flash chips (and dies, planes, blocks and pages) and in what order. This makes recovering data very very difficult even if the actual data is not overwritten in any way, because SSDs will often write in parallel for speed, which renders the oldest most bruteforcry digital forensic technique in the book on HDDs - simply transplanting the platters into a different drive, imaging them into hex and looking for file headers and subsequent zeroes (to identify empty space after a file) and reading in files as if they were written linearly to see what comes out.
That's as I understand it though.