First, the only way to be sure the information is gone is take a super powerful magnet and put it on the drive. However this will destroy the drive as well as the information. Your best option to wipe the drive and save it is get an app.
There is a good one here: whitecanyon.com" rel="nofollow">whitecanyon.com. The product called WipeDrive claims to erase your hard drive so it is unrecoverable by anyone, but computer forensic experts can still harvest data. You can find more information here: whitecanyon.com" rel="nofollow">whitecanyon.com.
You have 2 options for wiping the hard drive on a computer. You can restart the computer with a floppy in the A: drive, type Format: C and choose Yes when the warning appears asking to wipe out all data. The other option you have is to buy special software that overwrites the disk over and over again.
Simply deleting files on your hard drive doesn't delete them, you need to format it. Right click a hard drive in My Computer and select format. This will delete most traces of the files however a real computer expert will still be able to restore parts of the files.
If you are talking about sensitive data such as credit card information then it may be best to just keep the hard drive in storage.
The problem isn’t wiping out all the information on your hard drive. You can do that with a Gparted LiveCd. Just download the ISO in 0.4.8-6 and make a CD of it, boot to the CD, and destroy the existing partitions.
To wipe your hard drive clean you can completely reformat it to it's originally manufactured state if you have the operating system disk, or a disk that came with the computer when you got it. If you don't have a disk there might be a system restore checkpoint that will take you back to when the drive was new. If none of these are an option for you- manually delete and uninstall all of the things and programs you do not want.
After manually cleaning up, use programs like CCleaner and Defraggler to clean up all the bits and pieces that we miss or cannot reach as humans.
Use software like Norton SystemWorks which includes an application called 'Wipe Info'. Another is called . DataEraser by OnTrack.
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