In the past I've tried dual layer dvd's in the deck, took like a minute for it too start playing. Then used the usb connection with a thumb drive, that was pretty good.

I've got a new car with a stock cd player so have to find a new way to access my entire music collection. Think I have done it with a fm transmitter that can take a SD memory card or usb device, I'm gonna give that a try next
I have a SD memory card with 16GB of space, plenty big enough for my collection.