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I use Acronis True Image to make backup images of my OS drive from time to time, and it also includes a HD wipe tool that's quite robust. If you don't want the data on a drive to be recoverable, you pick one of many encryption schemes, some have more passes than others, and they write/rewrite data to the drive with each pass.
The 1's and 0's someone mentioned above is an option I believe.
American: DoD 5220.22-M;
American: NAVSO P-5239-26 (RLL);
American: NAVSO P-5239-26 (MFM);
German: VSITR;
Russian: Russian Standard, GOST P50739-95.
Features and Benefits
Microsoft Vista Support ? Support for Microsoft's latest and most robust operating system to date.
Securely deletes all the data and partitions on a hard disk.
Full review of the results of hard disk wiping through built-in DiskViewer utility.
Extremely easy to use Windows XP-like wizard-driven interface.
Data Destruction Standards
Microsoft The Acronis Drive Cleanser application offers the destruction of confidential information on hard magnetic disks with the help of special algorithms.
National data destruction standards
These algorithms ensures compliance with most known national standards:
American: DoD 5220.22-M;
American: NAVSO P-5239-26 (RLL);
American: NAVSO P-5239-26 (MFM);
German: VSITR;
Russian: Russian Standard, GOST P50739-95.
Predefined algorithms
Peter Gutmann's algorithm ? data is destroyed with 35 passes;
Bruce Schneier's algorithm ? data is destroyed with 7 passes.
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