The rectangular USB-A ports are slowly being replaced by the newer, smaller reversible USB-C ports, found in all newer generation Macs and PCs. Other important information to consider before making a purchase is the hard drive's connectivity. But if you want to store lots of large video and/or RAW files, or you want to use your external hard drive for housing games, investing in few more terabytes is a good idea. Even though many come in massive multi-terabyte iterations, 500GB is plenty to get you started. When choosing the right one for you, foremost on your mind should be its storage capability. WD My Passport deals: Which model to buy?