Either a driver is built in the kernel or it is in a loadable 
module. In the last case, the kernels looks for the module in /lib/modules.

     Therefore, if you want to mount a disk partition, you either need 
the necessary drivers and filesystem built-in the kernel or have them in 
the initrd/initramfs (under /lib/modules). Having the module on the disk 
won't help -- egg and chicken.

     Didier