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I'm not sure what the "35 pass" is about but if it's erasing the disk that much it's waaaay overkill. One pass is going to defeat everyone but a manufacturer's lab and 5-7 passes should defeat even military intelligence labs.



One pass is a proven failure against todays forensic tool's. The DoD's recommendation of 7-passes is the minimal.

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If you're running an older filesystem like NTFS or FAT under Windows no problem, but more modern filesystems like ZFS won't erase with simple file overwrites - it has to be a disk erase to prevent the bad guys from recovering data.



The Linux ext-3 filesystem is preferable. Easy to securely wipe, and totally transparent.
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