What is the collective noun for a group of cds?

There isn't a widely accepted collective noun for a group of CDs.

You could use a more general term like:

* Stack of CDs

* Collection of CDs

* Set of CDs

You could also get creative and use something like:

* Disc-o (a play on disco)

* Spin-cycle (referencing the spinning action of a CD player)

* Silverware (referencing the metallic shine of CDs)

Ultimately, the best choice depends on the context and the desired effect.