I provide a two-disk case for each student to store their disks in for the year. This prevents some of those dirty fingers getting all over the disk and causing problems. One disk is kept for word processing and the other for projects that require a lot of memory like Hyperstudio stacks. I number the disks and assign each student a number. That way they can be used year after year with minimal replacements. All my disk cases are placed in a basket in the room for easy access.