Mass Storage MP3 Players: Car Stereo Adapters

If you plan to use your hard drive-based MP3 player in your car, you will likely have to purchase an adapter separately to connect the MP3 device to your car stereo. Try a simple and inexpensive cassette-style adapter; it plugs into the headphone jack of the player and has a component at the other end that you slip into your car's cassette deck. Cassette adapters typically cost around $20 at your local electronics store.