I have a lot of music in my hard drive and some times they disappear. In my previous Ubuntu installation, this was happening very much. I did I fresh install a few days ago (not because of this) and now this returned: I noticed that in Rhythmbox a few songs were missing. After I opened my music folder and searched for them in Nautilus, they reappeared again in Rhythmbox.
It makes me wonder if something are happening to the search index. I don't think the hard drive is failing, because this computer is still one-year-old.
In the previous installation, files were missing in Nautilus. Sometimes I needed to press F5 for them to appear.
Thanks for the help.