Huge unknown file on hard drive

I have an HP Compaq nx6330 notebook running XP Pro SP2. The hard disk is 50GB in size. When I check the free space it says 3GB; however when I run WinDirStat there is an “Unknown” file of 25GB. I have run chkdsk /F/X on startup but this does not fix the problem. How can I recover this space from the “Unknown” file.

First, check this is not related to the System Restore process. Make sure you have a recent backup of your system then right-click My Computer and select Properties. Click the System Restore tab and tick Turn off System Restore on all drives.

When you reboot the computer check the file has gone. Turn system restore back on and restart the computer.

If the file is still there, check you don’t have a compressed files, a third party backup or file protection system as these can create these hidden files. You need to be very careful in deleting as they can be something very important.

If you do have one of these programs use the application settings to change the file sizes or to disable the program.


    You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

    Leave a Reply