The Numark HDX is a "digital turntable" that uses a CD player or an inbuilt 80GB HDD to play the music but has a full sized 12" vinyl platter to control the playback. It offers the complete feel of vinyl but allows the convenience of direct CD/MP3/WAV to be used 

The Numark CDX is a "digital turntable" that uses a CD player to play the music but has a full sized 12" vinyl platter to control the playback. It offers the complete feel of vinyl but allows the convenience of direct CD or MP3 CD files to be played.