You need to look into 'strap' module. It does all the animation and waiting for the floppy / PCMCIA bootable media.
The animation is a "script" of different kind of operations to perform. In order to replace it you need to write your own script or modify the existing one. I actually reimplemented a replacement strap module at some point. I could try locating it (it's possible I longer have the src however).
exec has nothing to do with the insert floppy animation.
Piru's depth of knowledge never ceases to amaze me! My god dude, you must be like a living Commander Data
