Avira AntiVir Personal (18-10-2012): Free anti-virus and anti-spyware on-demand scanner, detects and removes more than 50000 viruses and trojans (Windows Freeware).AbsoluteShield File Shredder works like this. What I am missing is a feature that allows me to directly erase a file or folder from Windows Explorer. Thus, if you have deleted sensitive data you can use Kill Disk to completely erase it. This is the reason why undelete utilities can recover deleted files if they have not been overwritten by other files yet. When the operating system deletes files on the disk, it only clears their directory entries. The Windows version can also be to wipe only unallocated data. The commercial DOS version also supports password change, partition recovery, and disk imaging. The Kill Disk suite comes with tools that help you create the boot media. To purge a complete system drive, you have to boot the DOS version Kill Disk from a CD, a USB flash or a floppy. Non-system disks can be erased with the Windows version. It took me 16 hours to erase a 300GB hard drive with the one pass method of Kill Disk. You also have to take into account that overwriting a hard disk is quite time consuming. This Wikipedia article claims that ATA disk drives manufactured after 2001 (over 15 GB) can be effectively cleared by one overwrite. If not, the one pass method of the free version of Kill Disk is most likely sufficient. The question is whether the hard disks on your PCs contain data that could endanger national security if the wrong person gets access to it.
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