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    Group29 Discussion Board :: View topic - File Wiping and disk drive clearing in Windows NTFS and FAT
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    Group29 Discussion Board Forum Index -> Group29 Tech Tips -> File Wiping and disk drive clearing in Windows NTFS and FAT
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    File Wiping and disk drive clearing in Windows NTFS and FAT
    PostPosted: Fri Jun 24, 2005 8:49 am Reply with quote
    BB
    Regular
     
    Joined: Jun 23, 2004
    Posts: 340


      


    Two open source programs that are useful for permanently
    wiping data storage devices or highly sensitive files are
    Darikís Boot and Nuke (DBAN) and Eraser. They can be
    downloaded from SourceForge at the following URLs:

    DBAN:
    http://sourceforge.net/projects/dban/

    Darik's Boot and Nuke ("DBAN") is a self-contained boot floppy that securely wipes the hard disks of most computers. DBAN is appropriate for bulk or emergency data destruction.

    Eraser:
    http://sourceforge.net/projects/eraser/

    Eraser is a secure data removal tool for Windows. It completely removes sensitive data from your hard drive by overwriting it several times with carefully selected patterns.

    Here is a C# code sample that will overwrite a file with junk before deleting it.


    Code:
    //The following .NET class
    //illustrates a simple, quick and effective way to ensure
    //that delete really means that a file canít be recovered
    //using software alone. The class wipes a file by writing
    //zeros in place of each byte of allocated space prior to
    //calling the regular file-deletion API:

    using System;
    using System.IO;

    namespace filewipeclass {
      class main {
        [STAThread]
       
          static void Main(string[] args) {
       
            FileWipe fw = new FileWipe();
            fw.Wipe(args[0]);
          }
        }
     
      class FileWipe {
        // File.Delete method only drops FAT/MFT entry
        // FileWipe destroys file data first.
         public void Wipe(string sPath) {
         FileInfo fi = new FileInfo(sPath);
         try {
           if(fi.Exists) {
             FileStream fs = fi.OpenWrite();
             for(int a = 0;a < fi.Length;a++) {
               fs.WriteByte(0);
             }
            fs.Close();
           }
           fi.Delete();
        }
          catch(Exception e) {System.Console.WriteLine(e);}
        }
      }
    }
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    File Wiping and disk drive clearing in Windows NTFS and FAT
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