The graph below depicts which of the following single subject designs? 
Definitions:
Platter
A rigid, flat surface in a hard disk drive where data is magnetically stored.
Spindle
A rotating axis of a machine, which tools or workpieces attach to for machining purposes.
Magnetic Disk Storage
Magnetic disk storage is a type of data storage that uses magnetic storage to record and retrieve digital information using one or more rotating disks.
Floppy Disk
A magnetic storage medium encased in a square or rectangular plastic shell, used primarily in the late 20th century for storing computer data.
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