Hey. The easiest way I've found is WinImage, on Windows oddly, with a USB floppy. The SE/30 should read 1.44mb floppies, no?
http://www.winimage.com/
For 800k floppies you'll need an intermediary Mac with Superdrive/GCR.
http://www.winimage.com/
For 800k floppies you'll need an intermediary Mac with Superdrive/GCR.