How is modules.aliases.bin created?

["Peter J. Stieber" <developer toyon com>]

I replaced a MB with a different manufacturers version.  I would like to 
use the HDs from the old MB in the new.  I'm trying to modify the 
contents of initrd-xxxxx.img from the boot directory to change the sata 
module that is loaded.

I can' figure out how modules.*.bin is generated from modules.*

Can anyone help me out?
Pete