Retrieving Deleted Photos from External Hard Drive

I deleted some photos from my external hard drive, is it possible to retrieve deleted photos from an external hard drive?

How to Recover Deleted Files from an External Hard Drive

Mistakenly Delete Files from External Hard Drive?

Well, I often make some mistakes carelessly. Today I made a terrible mistake that I deleted some important files from my external hard drive. This is not the first time that I make such a mistake, but I can’t afford to lose so much important data this time. I am hurry to look for a good way to get back the deleted files. By the way, the external hard drive is a 500GB Seagate external and my computer is running Win7 OS. I will somebody could give me some advice.