So far I’ve ripped ~6GB of music from old CDs. The MP3 player came with a 128GB microSD card, so it looks like I’ll be able to fit all I have saved with plenty of room to spare.

What I’m curious to try is putting TailsOS on the microSD, then a big NTFS or FAT partition, then letting Tails use the remaining space for persistent storage.

I’ve done this before, it works to create a multipurpose USB key for example. But the question I have is whether the MP3 player will be smart enough to find and use the music partition.