All you need to do is download onto your PC any general purpose data recovery tool. Most of these tools are designed to recognize documents and image files. And most are available on a free trial basis so that you can ascertain whether your deleted files are indeed recoverable before you need to purchase the program. These programs will scan through your external drive and within minutes return to you a list of all recoverable files. Using these tools you can recover lost data from flash drive media, and camera memory cards and even large external hard drives. Remember though that when attempting to recover digital image files such as deleted photographs you may need to purchase a program that specifically supports your camera manufacturer’s file types.