Rio Central Advanced Digital Audio Center (Discontinued by Manufacturer) 40 GB hard drive stores more than 650 CDs or 6,500 individual songs Easily transfers music to a Rio portable unit via convenient USB ports in front and back Uses integrated CD-RW drive to write standard audio CDs and MP3 data CDs Large display, intuitive interface, and advanced search features Supports common audio formats like MP3 and WMA, can be upgraded to emerging digital standards