CD-ROMs were CDs which were used to store computer data rather than recorded music.
In 1998, the CD-ROM containing VORACIA was stolen by Kevin Sutcliffe, who passed it on to the Fourth Doctor before he was killed. (PROSE: System Shock)
In 1999, the Jex plans for invading Earth were recorded on a CD-ROM which was acquired by the CIA. (PROSE: The King of Terror)