Is there a way to disable USB detection (more particularly bypassing USB
storage detection)?

We have a number of workstation use PXE to automate a lot of the Imaging
works but some have computers that USB storage devices attached and standard
imaging works will erase the drive.

If there are other paramaters to further disable other detections (ie.
PCMCIA) to speed up the PXE boot processes that would also be very helpful.