On my Pavilion G6 Notebook, I created a Windows 7 System Image and stored it on an external USB WD My Passport Ultra. When I boot off my Repair Disk (with the USB drive plugged in) and ask it to restore a System Image it says it cannot find one. Since it is definitely there (my Windows 8 machine can see the images on the USB drive), I assume that the G6 can not see the My Passport USB drive.
I did not realize that the USB ports on a laptop are at different levels though this makes sense since my USB mouse is plugged into the right side USB port and it never stops working in the Repair Disk boot mode.
I plugged the My Passport drive into the right side USB and the mouse into the left side and, sure enough, the drive worked and the mouse did not. Navigation is clumsy without a mouse but I can make that work.