I heard some people say theyre the same thing, but others are adamant that they have different meanings. Which is it?

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[–] 17 points 2 years ago* (last edited 2 years ago)

In modern parlance, this has been my working understanding too:

But yeah since computing came along disk has also been used more for magnetic media (hard disk) while disc has been used more for optical media (compact disc).

Optical:

  • compact disc
  • laser disc

Magnetic:

  • 3.5" diskette
  • 800GB hard disk drive

...and just to point out there is some disagreement

Magneto-Optical , such as Sony MiniDisc, is sometimes referred to Disc for its optical properties and sometimes as a MO Disk for its magnetic properties.

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