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Kill disk 1 pass zeroes.....does it get "more securely erased" if I run it more than once?

post #1 of 6
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Ok, so Im selling a couple raptors and before I kiss them goodbye, just making sure theyre erased securely. Ive downloaded kill disk and given them each a 1 pass zeroes run (im limited on the free-ware version), then I plan on giving them a full reformat and thats that. My question is, if I run the one pass zeroes multiple times, does that add extra insurance to more complete data erasing? Thanks in advance.
post #2 of 6
From what I've heard one pass is enough, but more passes would always be better (in the ludicrously unlikely chance that whomever receives the HDD would know how to recover the data), some people I know suggest as many as 7 times to render it completely safe but that is horrendous overkill in my opinion.
post #3 of 6
Recovering data is actually extremely easy given the tools out on the Internet.

On the note of zero passes, it's not 100% accurate to completely zero-fill a drive. In fact a while ago on OCN there was a member who attempted data recovery after each of 3 passes of a "zero-fill" program like Kill Disk. After the first pass he was able to recover roughly 25% of the original data. I forget after the 2nd pass what his recovery rate was.

In my own experience, I've been able to recover a decent amount of data after a single pass as well using consumer grade software. So I'd say run 2 passes if you're extremely concerned about your data.
    
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post #4 of 6
Theoretically, yes.
There's no instance in practice that highlights this, though.
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post #5 of 6
If you think about how a HDD actually works (physical platter drive not ssd) then no a single pass of all 0's will not erase everything on the drive, in fact it will simply wright over every thing on the drive with 0's allowing it to be ready for new data to be written on top of it. DOD standard is a series of 0 and 1 writes at 7 passes ( I used to do some forensic work with contractors). That being said I dont think anyone you sell a cheap comsumer grade drive to is going to take the time and money to do a full recovery on it, but I do know that single sweeps can be recovered easily with free softeware available, if you have the time why not run several passes?
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post #6 of 6
Quote:
Originally Posted by PLeXuS4200 View Post

If you think about how a HDD actually works (physical platter drive not ssd) then no a single pass of all 0's will not erase everything on the drive, in fact it will simply wright over every thing on the drive with 0's allowing it to be ready for new data to be written on top of it. DOD standard is a series of 0 and 1 writes at 7 passes ( I used to do some forensic work with contractors). That being said I dont think anyone you sell a cheap comsumer grade drive to is going to take the time and money to do a full recovery on it, but I do know that single sweeps can be recovered easily with free softeware available, if you have the time why not run several passes?

This. Is it better to run multiple passes of random 0 and 1's than just one pass of 0.
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