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When you format a drive you don't erase any of the data that on it. You only overwrite the part that keeps track of where files are (the filesystem). The only way to get rid of the data is to overwrite it. If you overwrite it with zeros as Azz suggests, an attacker will know which parts are information and which parts are zeroes instantly. Random data looks ...


The lack of output from losetup -a, and that fact that losetup -f gives you the first free device as /dev/loop0, shows that you haven't yet associated that loopback device with any physical storage. What unused physical partition or LVM volume do you wish to use as the actual storage for your loopback encrypted device? If it's, say, /dev/sd2a, then bind ...

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