system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What's the difference between a disk and a disc?
gpt
Disks are magnetic in nature. Floppy disks and hard drives, for example, are disks. They store data as magnetized blips on the disk.

Discs are optical. CDs, DVDs, Blu-Rays and so forth. They store data as tiny dips in the disc which can be seen with a microscope.

A good rule of thumb is to focus on the "k" and "c" - if the whole thing is round, it's a dis**c**. If it's angular, it's a dis**k**.