[SOLVED] Can't reformat btrfs USB drive

[dstuart]

Hi IriDium, that would of course be the easy option!
Sorry, I didn't make it too clear. I'm unable to format it on a Mac, Windows, or any other machine. Everything I've tried just kicks out the same response; along the lines of "Read-only disk", "Disk is not readable", or "Write-protected".

Here's the output as requested. (Note: the drive seems to be showing up as sda1 now; the systems been updated since my first post).
Pastebin