Sorry but not quite sure what you are asking. You've ghosted a drive presumably to another partition but is there any reason why it doesn't have a different drive letter at least? VirusScan should still scan it as far as I know. What errors are you getting?
I do know that the latest versions of VirusScan wont scan the same file twice, to save time and resources, so that is what you may be encountering here. But I back up my personal files to external drives and mine are scanned OK, so still unsure of what it is you are experiencing.