a hajlékonylemezek kora óta zavar a disc és a disk kettőssége. merthogy néhány szótár szinonímaként kezeli őket (pl itt), de mint végre kiderült számomra egy zöldségnek köszönhetően, van jelentésbeli különbség :-

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

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 or the disk in your computer’s hard drive, an external hard drive, and even iPod. Disks are always rewritable unless intentionally locked or write-protected. You can easily partition a disk into several smaller volumes, too.

Although both discs and disks are circular, disks are usually sealed inside a metal or plastic casing (often, a disk and its enclosing mechanism are collectively known as a “hard drive”).