Yes, to all intents and purposes, it is now commonplace to use disc for optical media, and disk for magnetic media (especially in a cassette of some sorts). This came from Compact Disc, and Diskette. Those of you who suggested that the correct English spelling is disc, this is correct. This word comes from the latin discus, and describes a round, flat object. The Americans, as they so often do, changed the spelling to disk. Therefore, when American companies started making diskettes, they named them thusly after their own spelling. Here's an interesting example. The 3" Floppy was used primarily by Amstrad, a UK company. Here you can see their own version of these diskettes: As you can see, Amsoft spelt it DISC. At the same time.... Maxell called it a DISK. In the end, we agreed to use disk for floppies / hard drives, and disc for CDs and later DVDs.
