[MacGyver] Can I use a spinning hard-drive platter to sharpen knives?

Otherwise useless hard-disk drive. Remove cover from hard-drive. Glue some sandpaper to platter surface. Hook up HD to isolated PSU. Instant knife sharpening station!!

If I have multiple hard-drives, I can apply different grits of sandpaper to them, and almost go from rough- to fine-finishing.

Please tell me what is wrong with me idea.