I definitely wouldn't use a spinning disk drive in my car. I see how unreliable that type of media is everyday at work as I replace laptop hard drives all the time at the computer shop I work at and I try to get as many customers as I can to move to SSDs. If not for the speed then for the bump and drop reliability. I tried using an old 64GB SSD in an enclosure in my car for awhile and my car didn't like something about it. Took 30 seconds or more for the music to even start playing. I currently use a tiny flash drive that barely sticks out of the USB port. They come in pretty large sizes if you really have that much music you actually listen to. A 16GB drive is more than enough for me. If I find I skip a song every time it comes on then it's probably time to just delete it.