Deleting a file or formatting your hard drive will not erase sensitive data. Use WipeDrive to wipe all data from your computer and start fresh with a clean hard drive. It also (somewhat unnecessarily) performs a read test after each full write, but if you end up finding bad blocks, you might as well just trash or recycle the drives and drill holes through the platters for maximum security.Wipe your hard drive completely clean. The badblocks -wvs command will run four wipes on the drive, writing the patterns 0xaa, 0x55, 0xff, and 0x00 across the entire disk, respectively. If you write random data to the drive, the argument is that the random data should make recovery more difficult (similar to salting a password hash). While there's no guarantee that writing zeroes to the drive is actually sufficient, it must be difficult enough that data recovery firms did not want to risk the negative PR associated with being unable to recover any data from the drive after it was zeroed. I didn't think it was sufficient to just write zeroes to the drive until a friend showed me The Great Zero Challenge. Personally, I usually boot off a Linux live CD and use one of the following: dd bs=1M if=/dev/zero of=/dev/sd# If there really isn't anything sensitive on the drives, or if you're just taking them out of service for reuse later, you're probably safe using a faster, less thorough wipe. If you are giving away the drives and they contained any sensitive information whatsoever, you're better off safe than sorry-go with a more thorough wipe over the course of days.
Generally, the extremely long-running disk wiping utilities do an extremely thorough job wiping the drives clean so there's virtually zero chance even the most advanced data recovery techniques would be able to use any residual magnetism to reconstruct the old data.
Of course, wiping a small drive over a slower interface (e.g., 80 GB IDE) may still be faster than wiping a much larger drive on a faster interface (e.g., 1 TB SATA).
Any other program that performs a thorough disk wipe will probably be similarly slow when wiping a hard drive that's either very large or connected via a slower interface. Edit: Based on your more recent comments, it sounds like you're probably running into hardware variations that cause DBAN to run slower (on older hardware) or faster (on newer hardware).
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