Came accross this weird bug in windows today.
I was copying a number of folders into my Music folder. It is laid out in an artist/album/track.mp3 format. Since I was copying in a number of albums from artists of whom I already had material stored I had to click Yes to the merge folders warning from windows. Since none of the files would be of the same name, I didn't have to worry about losing any files.
The problem was that already in the Music folder I had a folder called 'Sigur Rós' (notice the accent on the ó), and I was copying in a folder incorrectly named 'Sigur Ros' (without the accent). This shouldn't really have been be a problem, I would have expected to end up with two folders, 'Sigur Rós' and 'Sigur Ros', one with the older two albums in it 'Ágaetis Byrjun' and '()' and the other with the newer 'Takk' in it.
But this isn't what happened at all! Instead I now have two folders 'Sigur Rós' and 'Sigur Ros', BOTH containing 'Takk'. 'Ágaetis Byrjun' and '()' are nowhere to be seen! They are gone! (Luckily I was able to grab a copy from my mp3 player, so I didn't lose it, but that was lucky, I would have been pissed!)
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The weird thing is that 'Sigur Rós' and 'Sigur Ros' appear in explorer as two seperate folders, but act as a single folder. There is only a single folder, changes made in one folder are shown in the other.
Though this was a weird quirk, and thought I'd share.