I read some answers on a question that said that :
After deleting some data from a hard disk - Doing three passes is considered Department of Education 'secure'. Anything over 10 passes is Department of Defense 'secure'.
Would someone please elaborate.
Source : How do computers permanently store data?
I found no options to ask my question on previous question itself.
Answer
In the previous answer I mentioned that to wipe out a file, you use a special tool that goes and specifically fills the place where the file was stored with 0s or junk. The number of passes is the number of times you repeat this over the same area. For instance, at this post you can see that Eraser allows you to select how many passes you want.
Frankly I myself am not too clear on the details, let me find some references.
Edit
It looks like the need for multiple passes MIGHT be a myth, atleast as far as modern hard disks are concerned. You can see this site "for a modern drive, one wipe will do just fine"
Wikipedia also agrees, according to it >1 pass is necessary for a floppy disk(remember those?), not a modern hdd.
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