I was thinking about getting a multimedia hard drive for the home. I have no need to put on in my car, but I thought some one else might like the idea and could let us know how it worked.
A multimedia hard drive enclosure on eBay is about $80. They come with drivers for divx, etc and audio/video cables. You can get a nice 16mb, 400gb hd for about $120. Also a power supply . And now you have 400gb of movie/music storage for about $200.
I know I saw a posting from NYCPaisan in the past about having a hard drive hooked up to a codec provider. This solution seems better.