![]() Although on this last point, I'm not sure because in Windows such info was held in the various registry hives and I'm not yet conversant with such matters in Mint. True, if anyone is so determined to try, and using some pretty sophisticated kit, they could, in theory restore some remnants, especially from an HDD (not so much SSD) of the file. With images, using GIMP (for example) merge a 'one colour' layer with the original then save, rename, then delete. So, having concluded that, with Linux distros, even after using Bleachbit (root) there is no totally secure way to eliminate all traces of unwanted files from either HDD or SSD, the only way is to, before any deletion process, save a copy of the file in question onto an encrypted pendrive (just in case) and then, with documents, remove the content, save and then rename, then delete. Interesting replies to my initial question. You can recover deleted files using TestDisk and/or PhotoRec. Hence I always recommend to use disk encryption with SSDs. That way it doesn't matter that disk blocks with confidential data could be recovered as the data would be encrypted. More trivial then is to just set up Linux Mint with disk encryption at time of installation. That's the only reliable way to erase data from a SSD. In short, if you want to reliably delete data on your SSD you have to issue the ATA Secure Erase command to the disk which makes the SSD firmware erase the contents of all the flash chips. Data would be recoverable in that case by reading the flash chips directly with a flash chip reader. ![]() Eventually the data may get overwritten, or the blocks may be swapped with those in the spare area in which case the data is retained indefinitely. Only the SSD firmware knows how logical disk blocks map to actual physical locations on the flash chips. This is part of SSD's wear leveling algorithms. ![]() When you overwrite a file on a SSD, the SSD firmware just marks the current blocks of the file as available, leaves the data on it, and assigns other, less often written to, previously available blocks to the file and writes the new data to that instead. Any 3rd party program that claims it can erase the data of a single file is a scam. You can only erase the data of the entire disk. ![]() Seeing as you have a SSD, you can't reliably erase the data of a single file.
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