From Longman Business Dictionary
CD-ROMCD-ROM /ˌsiː diː ˈrɒm-ˈrɑːm/ (also CD-Rom) noun [countableC, uncountableU]COMPUTING compact disc read-only memory; a small disk on which large quantities of information can be stored to be used by a computerA CD-ROM holds something over 600 Mb of data.
The official journal of the EU is available on CD-ROM.