2936 Fall down go poof

My F: drive has stopped working. It recognizes files on a disk, I can even use them. But if I try to copy from my hard drive to a disk, it tells me to put a disk in. This means if I down load my photos to my computer I can't select and copy to a disk to have them printed, because the drive never finds the disk. Also can't back anything up on a disk. Anyone know what the problem is?