What does a hardrive store data on?

Answer 1

The harddrive stores data on a single magnetic disk, somewhat compareable to a CD in the way that it spins, its round, and it stores data. The "head" of the harddrive uses magnetic fields to excite different areas of the disk to store a binary code such as "00100010." Millions upon billions of these codes are stored on the disk with each code being a single command.