Nero does not recognise audio tracks on data disk

Hi i put all my mp3s on my harddrive on to a data disk whilst i reformatted my computer, when i put them back on the harddrive after reformatting they played fine, but nero will not recognise the format when i try to burn them on to a normal audio disk. Is there anything that i can do to get nero to recognise these formats any help would be great.

very odd indeed, i mean they are either mp3 files or they ain’t, right ?
first, try another app and see if that works. eg.,