On an external hard drive, a bunch of files have disappeared. The files contained music (mostly mp3s and flac files).
I mostly use Foobar2000 to play music. Now if the songs are already in a playlist they can still be played. If I know the name of the folder it is possible to type the name and find it. However if I use Windows or Foobar to try and see what folders or songs are there, they will not appear.
I have tried to scan for malware and viruses and have also tried unhiding hidden files. I am using Windows XP.