This dilemna happens frequently, especially with machines running Windows 8. Recently, I had 2 hard drives that just randomly show as RAW disks. It sounds like you have important data you need to salvage, but ultimately, the drive will need to be reformatted in order to once again work with your operating system.
You have two options to recover your data:
1. Download a linux based operating system called UBUNTU
www.ubuntu.comIt can be installed on a disc, and run entirely off the disk without affecting your computer. Magically, Linux operating systems struggle less with accessing difficult drives. You may be able to simply run Ubuntu off of the cd, plug in your drive and simply copy and paste the important data onto a different backup media.
Option 2:
Download EASEUS recovery tool for free.
http://www.partition-tool.com/download.htmUsing this program, you can scan the disk for bad sectors, and you can set the program to repair the disk, making it accessible. Even after, the disk may show as a group of scattered disorganized folders, but you should be able to find the information, move it to another media and then re-format for a brighter future.
Good luck,
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