problem with Seagate Expansion Drive not recognised

[Noobie]

Hi, I'm new to the forum so please bear with me!

So I've been using my external hard drive for over a year to store music and photos; it has a 500GB capacity.

But recently when I've plugged my hard drive in it's not showing under my computer, or if it does show it wont open and I keep getting an error message. Is there any other way I can go about searching for it on my laptop?

I don't know if it's my laptop or my hard drive that has the problem, and really need some help please!
(The only other laptop I have available is a Mac, which i cannot use to open the hard drive unless I format it, which means losing my data so i really don't want to do that)


EDIT: i've followed the troubleshooting on the seagate website, and discovered that my hard drive partition is RAW.. is there a way i can change this?

 

[GokAy]

Run Partition Wizard free's - Partition Recovery Wizard with a Quick Scan, then take a screenshot of the results and post here, quit/exit out of wizard and remove your external until further instructions from an expert.

http://www.sevenforums.com/tutorials/9733-screenshots-files-upload-post-seven-forums.html