I think the following link can help you use that method, This is a kind of encryption rather than overwriting the whole memory and very efficient. It is possible to use re-linking between logical addresses and physical memory cells with hdparm. It will be much more efficient (much faster). If you really need this high level of security, it is better to backup or clone the data to another drive and wipe the drive with a special tool, that works on a lower level, for example hdparm or DBAN. Only two passes are written: one mode with 0xff and a final mode with random values. So the following command with sfill might be a good option (it overwrites twice), sudo sfill -l /path-to-mountpoint (I need not guess here, but if you know, please edit this answer.)Īccording to the comment by can not be recovered if it is overwritten more than once I don't know if zerofree or sfill is more efficient (faster), when doing the same thing. Or maybe they must be separate sudo sfill -l -l -z /path-to-mountpointīut you might as well let it write random data once sudo sfill -l -l /path-to-mountpoint If I understand the manual correctly, sfill should work like zerofree when using the following options (but I have not tested). You can use options to make it faster and (maybe) less secure. Running sfill with 'wipe mode is secure (38 special passes)' needs 38 times longer time and will wear the drive 38 times more. Where x is the device letter and n is the partition number (for media devices probably sdb1). You can do it with zerofree sudo apt install zerofree I think it enough for all the needs of ordinary people to overwrite once (and with zeros).
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