Hello,
The issue is that you are using PC-DOS, and the USB support within PC-DOS is pretty shoddy. I would recommend booting into a PE environment (either WinPE or BartPE) and using the Ghost32.exe executable. These environments have native USB support, and will work. Your options for this are as follows:
1. Upgraded to GSS 2.5 and use the Ghost Boot Wizard to create a WinPE-based boot device;
2. Manually create a WinPE disk and add Ghost32.exe;
3. Manually create a BartPE CD and add Ghost32.exe.
I would advise #1, as it is the easiest implementation.
Thank you,
Randy