In the old days, we used to have cassette tapes. Then, move on to CD and CD changers in the boot.
Currently, they give us a USB socket to connect our thumb drive.
Well, in my opinion, in terms of safety and in terms of aesthetics, not so good leh, with either a wire or the sore thumb sticking out. Just why don't we have say 2 slots for SD cards and that is all we need. 16Gb of music - can last for a trip up to Penang and back and still have more than enough music la.
But, for those driving MPV, DVD for your kids behind.