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by tinus_hn
3388 days ago
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An SSD, like a SD card is actually a computer that accesses a large amount of unreliable storage and presents it as a smaller amount of reliable storage. It is impossible to reason about the way the storage actually works because it is completely invisible. If you write a large amount of zeroes, the disk may well only write one sector of zeroes and use some index to show it all over the disk. You'll never know. If there is a bug in the firmware or someone uploads a different firmware to the controller, it might be possible to retrieve the data you thought was overwritten. The only way to be sure that the data cannot be retrieved is by encrypting it with a key that is stored in a place where it can be removed. |
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