Making of chinese wind chimes by using a hard disk platter.
A hard disk drive platter (or disk) is the circular disk on which magnetic data is stored in a hard disk drive. The rigid nature of the platters in a hard drive is what gives them their name (as opposed to the flexible materials which are used to make floppy disks).
Platter: The Platter is the flat aluminum disk which holds all the recorded data. A hard drive can have two or more platters stacked up depending on its storage capacity. To increase the durability, the platters are now a days coated with a magnetically retentive substance like oxide or thin-film.