![]() Consequently, utilities that are advertised as providing "secure drive erase" functionality may not be fully secure, if applied to a SSD. ![]() As a result, even data you think you have erased, may still be present and accessible on the SSD.Īlso, SSDs are a bit tricky to sanitize (erase completely), because the methods that used to work for magnetic HDDs don't necessarily work reliably on SSDs (due to the aforementioned wear levelling and other issues). ![]() The old version may eventually get erased, or it may not. Instead, it writes the new data somewhere else and just change a pointer to point to the new version (leaving the old version laying around). When you ask the SSD to "overwrite" an existing sector, it doesn't actually overwrite or delete the existing data immediately. One reason is that overwriting data on a SSD doesn't work the way you'd think it does, due to wear-leveling and other features. One takeaway lesson is that securely erasing data on a SSD is a bit tricky. USENIX Conference on File and Storage Technologies, 2011. Reliably Erasing Data From Flash-Based Solid State Drives. The following research paper studies erasure of data on SSDs: This is especially true on SSDs, due to wear levelling and other features of SSDs. A normal format only deletes/overwrites a tiny bit of filesystem metadata, but does not overwrite all of the data itself. If you do a normal format, the old data can be recovered.
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