If you don't want your system to boot to the TrueCrypt password entry prompt (thus making it obvious it has been encrypted using TrueCrypt), you can make it so that it is unbootable and boot the system from your grub4dos USB drive and then from the USB drive you can boot to the encrypted Windows installation on your hard drive.
There is no 'unique' data or files on the USB drive, if you lose it you can easily make another.
see http://www.rmprepusb.com/tutorials/131truecryptusb for more details.
You can add the TrueCrypt Rescue ISO ( the one that is made when you start encryption), to your E2B USB drive, but you must rename the file extension to .iso01.
There is no 'unique' data or files on the USB drive, if you lose it you can easily make another.
see http://www.rmprepusb.com/tutorials/131truecryptusb for more details.
You can add the TrueCrypt Rescue ISO ( the one that is made when you start encryption), to your E2B USB drive, but you must rename the file extension to .iso01.