You're right. I was looking at my old "Super I/O" card that states it "contains a Floppy Disk Controller" and thought this was an IDE/ATA interface but guess that's different.
It states:
» Supports two 360K / 720K / 1.2M / 1.44M / 2.88M floppy disk drives
» Enhanced digital data separator
» 3-Mode drives supported
But, it's definitely not USB since it has the old parallel ribbon cable connectors that connect to the old 3.5" floppy drives.
Yep, you are good to go and as safe as the US ICBM operators. Although if I remember correctly the ICBM operators are required to sit on their chairs (with rails instead of rollers) and wear seat-belts (chairbelts?) when swapping floppies.
Important edit for the beginners:1) Do not allow any of the computers to boot off of the floppy or CD-ROM. Always remember to immediately remove the floppy or CD-RW used to exchange the data between the computers, lest you forget and reboot the machine accidentally.
2) Do not install any additional drivers that might have came with the PCI board or the laptop expansion bay. The added device should be recognized by the OS itself. If the device isn't auto-recognized then it also isn't really safe. There were well-know vendors who inadvertently distributed viruses/trojans/bad OS patches on their pressed driver CD-ROMs.
I apologize for not putting this disclaimer when writing the original message.