My el-cheapo car radio takes a usb stick or sd card. I couldn’t even tell if the cd player is functional as I haven’t used ever since. One tiny annoyance though. The order it plays is kinda random, probably something like how it’s physically sequenced in the file system. Rather annoying when i.e. copying a classical concert. But I think I got the perfect helper now. Empty the stick, then use Amok Playlist Copy to create or load a playlist and hit copy. It will copy the files the playlist points to to the destination (stick). Simple. One of these (free) have-to-have’s.