If you are using XP, try NTFS. Go to MS website to take a look. Here is one of the link.
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q314463&ID=kb;en-us;Q314463.
http://support.microsoft.com/default.aspx?scid=kb;en-us;Q314463&ID=kb;en-us;Q314463.