Reading floppies ( sampler disks ) of unrecognised format, supressing <ignore> <eject>

Ive been working on some code for looking at the disks from my old Roland sampler. Even though the system pops up a warning .

"The disk you inserted was not readable by this computer."
<ignore> <eject>

It is actually possible to read the disks at this point from the command line, and copy them using dd.

what Id like to do is :
1) be informed a floppy was inserted
2) be able to check its structure and if its a sampler disk prevent the ignore/eject alert popping up.

I have looked at Disk Arbitration very briefly but am not sure if this all I need to be looking at.

Any advice would be helpful.

RD