I have noticed that there are issues with cloning the Toshiba A500 series laptop. The cause is that it has a different storage controller, the Intel Series 5. I expect more laptops are going to be using this in the future, and this would be a good driver to add to your Windows PE build. The driver itself is a bit hard to locate; the only download I was able to find was in a larger package containing a large number of other drivers. Here it is:
Please note that this is a Windows Vista driver, as required by Windows PE. Make sure that when you add it, the Vista box is checked. Here are instructions:
How to add drivers to DeployAnywhere or WinPE.