All modern drives have a key-erasing unblocking key sequence, there probably exists a secret, non-key-erasing unblocking key sequence for law enforcement use as well. SSDs usually encrypt all data to increase the efficiency of wear-levelling (to randomize data, not for security!), but you cannot rely that there is no way for law enforcement to recover the encryption key. You might be doing a "secure erase" and the complete data is still on the disk. Which means that you have little or no control about what data you actually overwrite when doing a secure erase. It does not matter so much whether it's possible, but whether you (or the data on your disk) are important enough to justify the expense.įurther, modern drives increasingly perform wear levelling (SSDs in particular do that for every single write). Admittedly, data density has increased a few orders of magnitude since then, and it is very likely that a 100% restoration will not be possible, but you must expect that a sufficient amount can be restored. That's something that has been done more or less routinely with black boxes since the 1970s. It is very well possible (and not hard, just expensive) to reconstruct data from magnetic store even after it has been overwritten a dozen times. At least, if whatever you may have on that disk is worth the effort. If you think of a secure wipe in terms of running some "secure erase h4xOr tool", then sorry, you're out of luck. If you think of a secure wipe in terms of first formatting the drive, then opening the case, running a rare-earth magnet over the platters, working on them with a heavy hammer and a wrench for a couple of minutes, and finally dropping them into a camp fire, then no, police will not be able to recover the data.
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