I recently wanted to do a clean install of Windows so I swapped my boot drive to a secondary postion and added a new boot drive. Installed Windows on the new boot drive and started to move off my important files and items from the old C drive. So this is what I have:
Drive 0: C:\ (whole drive single partition)
Drive 1: Part 1: e:\ (old boot drive with old windows)
Drive 1: Part 2: f:\ (documents partition)
Drive 2: X:\ (drive for storage)
Once I was installed and working, I formatted e:\ so that I could create a new drive for program installation separate from c:\ -- WOOPS! I forgot to grab a few files from the old windows install! My bookmarks from Firefox and a few Saved Games files. No problem really, nothing has been written to the drive yet, so I remember Recuva and install it to my new C:\ and run a deep scan... wait two hours... skim through 500k files found and find about 25-30 files that are excellent recovery items, and recover them to a folder on my x:\ BAM! I realize something has changed because a few of my taskbar icons change to unknown image instead of logo.
I open My Computer and I now have an UNFORMATTED E:\ and a tiny 12gb F:\ labeled 'Factory_IMage'
I have lost almost 350GB of data stored on my original F:\
I've just been trying to get a picture of your new setup since moving the drives around.
Firstly it appears that your F: partition is probably OK as that would be your factory installed "Recovery Partition", usually labelled D:, and would have been about the size you mention (12gb). Mine was actually about 9gb.
I'm not exactly sure, but it sounds like you may have accidentally deleted your E: partition, and if that is the case, you should be able to "Undelete" it.
I think the best thing to do at this stage would be to try scanning for a lost partition, and see how that goes.
Download and install "EASEUS Partition Recovery 5.0.1"
The guides are on the right of the page. I didn't link you to the home site for the program download because Softpedia is a better download location than the one the home site uses.
There are also screenshots of the process here ...