I'm using RIS to boot machines from PXE in order to clone driveless notebooks.  In the past I was using GhostWalk to perform a SID change on the notebook after cloning.  This works great off of floppy and boot CD, but when Ghost finishes the clone off a network book, the boot disk give me:

General Failure reading drive M

Temporarily I've setup a 2nd RIS boot disk to just run GhostWalk, but I'd like to get this down to one step.

Does anyone have any idea why the network boot disk becomes inaccessible after cloning?

RIS - Remote Installation Services
Windows service used to deploy OSs.

PXE - Portable eXecution Environment
ROM based boot protocol for booting directly off a network.