On Sun, 3 Nov 2024, Steve Lewis via cctalk wrote:
Non-descript 5.25 DS/DD (they don't format as
1.2M disk using a 1.2 5.25"
drive, so I'm pretty sure they are actual 360KB disks). That said, I
haven't really fully confirmed if it's a 1.2M drive. TEAC FD-55GFR
142-U, because I haven't actually come across any 1.2M formatted media.
Do they have hub reinforcing rings?
If yes, then they are probably 360K
If no, then they are probably 1.2M