I rip my own CDs to WAV files and put them on a drive.
I put them in album folders and keep the track numbers first, so I can listen to an album with the tunes in order. I use the format 01, 02, 03, etc. so if there is more than 10 tracks, they still play in order. For a 2 CD set I put them in the same folder and start the second CD with the next track number available after the first one is ripped.
My old car doesn't have a USB port, but it does have an aux jack. I have a digital Walkman with over 10,000 tones on it ripped from my CD collection. For the car I use mp3 files since there is so much road noise that super hi-fidelity is a waste. I drive a mini-van because doing one-nighters for a living, I need it to haul the PA, guitars, saxes, and synths around.
Insights and incites by Notes