The car ignores a Boombox folder on the drive that records TeslaCam. But it reads every partition on a drive as its own volume. So split the drive once: a small Boombox part, a big TeslaCam part. Both work, nothing to unplug, and the Lock Chimes app sees each part as a drive.
A web page can't touch a disk directly, so this page writes the exact commands for your computer and you paste them in. Takes about two minutes.
Boombox folder on the BOOMBOX part. Up to 5, no spaces in the names. The app does this for you.LockChime.wav at the top level. The app writes it to whichever part you pick; putting it on both is fine.Prefer not to use the Terminal? A small Mac app that does all of this with one click is on the way. In the meantime a second USB stick in a glovebox hub works too.