Mysteries of the Desktop Folder
When Microsoft designed Windows 95 with a trash can, there was a single desktop folder for the system. If you dragged files from a floppy disk to the desktop, the files were copied to a folder on the hard disk. When you formatted the floppy disk, the files you had dragged to the desktop were still there.
Every Macintosh HFS disk had its own desktop folder. If you dragged files from a floppy disk to the desktop, the files were moved on the floppy disk. When you formatted the floppy disk, poof! the desktop files disappeared.