disk is not recognized

i have x-plane 10 on my computer and up until now the disk has always worked but now my computer does not recognize the disk, it knows there is a disk but cannot read it. i have tried the disk in another computer and it works and i have also tried other disks in my computer which worked. so basically this one disk doesn't work in my computer which works in other computers and my laptop is not broken. THIS DISK USED TO WORK ON MY COMPUTER