you could make a partition on that ext hard drive using free space and then clone your internal hd to that. there is free parion software.
Windows Disk Management is one others are:
MACRIUM REFLECT FREE EDITION to make a full and recoverable
backup image of the HD.
http://www.softpedia.com/get/System/Back-Up-and-Recovery/Macrium-R
eflect-Free-Edition.shtml
- PARTITION WIZARD HOME EDITION to manage the partition of the HD in
a professional manner (the only one available on the market for free to
64-bit users and businesses)
http://www.softpedia.com/get/System/Hard-Disk-Utils/Partition-Wizard-
Home-Edition.shtml
In fact, as you can see from the above SOFTPEDIA blurb, PARTITION
WIZARD HOME EDITION is more than a basic HD partition manager, not to
mention that it also has a terrific boot performance to.
PARTITION WIZARD HOME EDITION main features:
* Resize/Move partitions
* Create partitions
* Delete partitions
* Change Partition Label
* Delete all partitions
* Format partitions
* Convert file system
* Explore Partition
* Check Partitions
* Partition Recovery
* Wipe disk
* Wipe partition
* Copy partition
* Copy disks
* Initialize to MBR disk
* Initialize to GPT disk
And now PARTITION WIZARD HOME EDITION has launched even a FREE
Partition Wizard BOOTABLE CD VERSION enabling users to run the
program from a CD without ever booting into Windows, a Godsend tool for
those that for any reason are not able to boot Windows but want to manage
their partitions to make room for a different OS or for any other kind of
SW.
http://www.partitionwizard.com/download.html ...<please no links to direct downloads>