As you save, erase, and move files sometimes things do not go just right. This is not caused by anything you are doing wrong. A PC is a very complex, fast machine and despite the best efforts of all the designers, engineers and programmers who've toiled to make it flawless, sometimes programs collide and mess up each others files.

This unwanted interaction can result in invalid files, files with lost file fragments, and cross linked files. You don't always know right away when this happens. This is why you should run the Scandisk utility from time to time.

For Windows XP and 2000:

In XP and 2000, the utility is called 'Error Checking' and doesn't offer the full physical surface check.

  1. From 'Start' double click 'My Computer'.
  2. Right-click the drive you want.
  3. Click on 'Properties', then 'Tools'.
  4. Under 'Error Checking' click 'Check now' and then Start.
  5. A small scandisk window appears and the process begins.

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