On: The Reliability of Optical Disks

[rascul]

Laser disc, compact disc, digital video disc, and blu-ray disc are (from what I understand) officially spelled with the c. I'm in the US and that is the typical way to spell it that I see, but I also see the k is generally used for hard disk and floppy disk.

That said, there are a lot more instances of "disk" than "disc" used in the comments here so far.

[theandrewbailey → rascul]

The reasoning I've seen, is that disc is the recording media itself, whereas disk includes things like a sleeve, case, and/or IO heads.