This is why they're called "head" units: with the powerful, versatile DEH-P90HDD you can record CD Audio (from the unit itself or from a Pioneer changer) onto a 10GB hard disc drive, which holds about 200 audio CD's (using ATRAC3 digital compression). Your CD's are recognized by the pre-installed Gracenote CDDB database, which includes auto-playlists that make finding a specific CD easy. The DEH-P90HDD plays your MP3 CD's plus CD Audio, CD-RW, and CD-R discs. And, the MagicGate Memory Stick player lets you play recorded Memory Stick tracks on the road. The Organic EL display is easy to read and accepts image downloads, so you can customize its look. Built-in DSP offers a 13-band graphic EQ and a huge variety of tools to best match your music to your vehicle. The DEH-P90HDD is XM Ready and provides a steering wheel remote. Smart.