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?

Western Digital External Hard Drive Not Acessible – Can’t Access or Format WD External Drive

FAQ: What’s Wrong with My 1TB WD External Hard Drive That Becomes Inaccessible?

Question: I couldn’t access my 2TB Western Digital external hard drive any more. My computer can recognized the drive as a removable devices and it acts as a normal drive except that I can’t access the data inside the drive. I have been using this external hard drive as a storage media for all my important files like family photos, videos taken on my holiday and my work papers. I also tried to format the drive but my computer said can’t find direct access or something like this. How can I restore all files form this WD external hard drive?