@miguelvaz: The first bit vaguely looks like macOS is mounting the partition read-only, which is... bad?
I have no idea if macOS can fsck FAT32, so, unless someone more familiar with Apple stuff has a bright idea, get your hands on a Windows/Linux system and run a filesystem check there.
As for the second bit, assuming you did nothing wrong, no real clue about what got Terminal's panties in a twist, I'm not running Catalina, no issues on 10.14 on my end.
Last edited by NiLuJe; 04-10-2020 at 01:15 AM.
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