I take a lot of photos which I transfer directly from the camera to my laptop. To save disk space on my laptop and in order to back up important files, including my photo collection, I use a WD external drive. I also keep a couple of usb drives in my computer bag. They are very handy when I need to transfer files from one computer to another. If you are one of those who store important files in your computer, make sure you have a usb drive with you - at all times.