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> old wives' tale that data could be recovered unless it was overwritten 7 times. https://www.lifewire.com/dod-5220-22-m-2625856 https://www.lifewire.com/dod-5
by WrtCdEvrydy 10y ago
> old wives' tale that data could be recovered unless it was overwritten 7 times.
https://www.lifewire.com/dod-5220-22-m-2625856 https://www.lifewire.com/dod-5220-22-m-2625856
This is the spec where people come up with. The idea is that you write a 0 pass, a 1 pass, and then a binary switch (3-pass). People have taken it to extremes with 5 pass and 7 pass BS. Honestly, doing 0's over the drive once is probably sufficient as long as you get every single byte.
- WalterBright 10y agoI read about that 7x stuff back in the 80's. As I recall, it was based on the idea that you could look at the disk with an electron microscope or something and it could pick up echos of the previous data. If this actually worked, data recovery companies would make a mint recovering overwritten files. But I've never heard of anyone advertising such or ever accomplishing it.
- WrtCdEvrydy 10y ago> data recovery companies would make a mint recovering overwritten files Data companies make mint recovering deleted files and hard drives that have been disabled by the motor or control board just failing but recovering a full file from a hard drive with a microscope would be ridiculous.