You've got quite a CD/CDs collection!

[xiaoen]

Hi,
In the above picture why isn't "a CD" pluralized? I mean "CDs collection"

You've got quite a CD collection!
You've got quite CDs collection!

 

[GoesStation]

The text uses CD as an attributive noun (a noun which functions as an adjective).

 

[xiaoen]

Thank you. Can "CDs" also work?

 

[Rover_KE]

You can say 'You've got quite a lot of CDs'.

 

[SoothingDave]

We don't pluralize nouns when we use them as adjectives. A shelf for books is not a "books shelf," it is a "book shelf."

A bottle that holds 5 gallons is a "5 gallon bottle."

 

[GoesStation]

A bottle that holds 5 gallons is a "5 gallon bottle."

Or better, in my opinion anyway, a "5-gallon bottle".