Need recommendation on floppy substitute

I'm looking to create a NMP (No Moving Parts) firewall based on LEAF.
To accomplish this, I need something to replace the floppy drive, or an
alternate boot device. This something needs to be mountable/unmountable
like a floppy.

Any advice would be appreciated.

--
George Toft
Computer Security
AGD,llc
www.agdllc.com
623-203-1760