- I've looked around and it looks like the 64 gb card may work but only if you reformat to FAT32. Has anyone done this, and does it work? Can you do this with a PC? (I've seen some comments that it may be difficult to reformat with a PC. If so, what if I use formatting software like this: https://www.sdcard.org/downloads/formatter_3/ ? )
I've never used a 64 GB microSDXC card before, but don't most microSD cards come pre-formatted as FAT32?
- Also, does the Zip have on-the-fly playlist capability (orig OS or Rockboxed)?
Yes, I believe both support an on-the-fly playlist feature.
- Can you delete songs from it without using a computer? (I was surprised that my Sonys could not do this.)
Yes you can in both Zip OS and Rockbox.