You've caught me on the one day in the last ten in which I have used my car to take the less than 1 mile trip to the supermarket rather than looking longingly out of the window at it
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SD cards work best if you have full albums. I ripped a load of mine from CDs when I first bought the car. One thing is that it doesn't work well with mix albums or anything where there isn't a gap between tracks as you will get a small pause between them.
When naming tracks I seem to recall it is best to use track number / name as the convention (eg. 1_trackname) in order that they play back in the right order. All tracks for a given album should be in the same folder. Most rippers will take care of the artwork for you.
I spent a fair bit of time prepping this before I got the car as I had a few months to wait for delivery, but to be honest since then all of my listening has been via Apple Music / Carplay or Spotify / Android Auto depending on the phone that I have had at the time.
Some photos of my slightly dusty car. A job for the weekend maybe.
With track playing
Edit: dropbox doesn't seem to want to render this one the right way round!
Folder view.
