[NPMUG] What's the difference between a "disc" and a "disk?" ( Apple explains )

[Dave Sevick]

http://support.apple.com/kb/HT2300

They're pronounced the same, but, technically speaking, there is a  
distinct difference between a disc and a disk.

Mac OS
Discs
A disc refers to optical media, such as an audio CD, CD-ROM, DVD-ROM,  
DVD-RAM, or DVD-Video disc. Some discs are read-only (ROM), others  
allow you to burn content (write files) to the disc once (such as a CD- 
R or DVD-R, unless you do a multisession burn), and some can be erased  
and rewritten over many times (such as CD-RW, DVD-RW, and DVD-RAM  
discs).

All discs are removable, meaning when you unmount or eject the disc  
from your desktop or Finder, it physically comes out of your computer.

Disks
A disk refers to magnetic media, such as a floppy disk, the disk in  
your computer's hard drive, an external hard drive. Disks are always  
rewritable unless intentionally locked or write-protected. You can  
easily partition a disk into several smaller volumes, too.

Disks are usually sealed inside a metal or plastic casing (often, a  
disk and its enclosing mechanism are collectively known as a "hard  
drive").
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