I know some people think a USB HD won't work in the car and that it can't play WAV files. This is demo of my second USB 1tb HD, a Western Digital 1tb USB HD. The original Oyen 1tb drive that I have been using in the car(s) since 2011 has died after 5+ years. I have used USB HD's in 3 BMW's from a 2008 E90 non-iDrive thru 2017 F87.
While I don't have screen shots showing the files are FLAC or WAV, you can take my word on it until the next time I get the HD out of the car and plug it into the computer for some reason.
The youtube video shows a FLAC playing and all of the searching and grouping capabilities that come along with formats that carry a digital ID like FLAC or AAC and then finding and playing a WAV title.
This video is safe for work but may put you to sleep
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2016 750i X-drive
2017 GMC Sierra Denali
1997 MB SL500, 19"AMG replicas
Past BMWs: E30 323i, E36 325is, E36 M3, E46 M3, E39 M5, E46 325i, E90 335i, F80 M3, F87 M2