Crossword Genius

Charlie to drop off the last piece of manuscript on antiquated storage devices (2-4)

Ross

I believe the answer is:

cd-roms

I'm a little stuck... Click here to teach me more about this clue!

'storage devices' is the definition.
(CD-ROM is an example)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for cd-roms that I've seen before include "Particular discs" , "Type of compact discs" .)

I've seen this clue in The Irish Times.
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