Internal Hard Drives. Whether you are buying a computer, laptop or tablet, you first need to consider what you are going to use it for. That piece of information will guide you towards the type of internal hard drive you need. If you are looking for a laptop and using it for simple web-browsing, word processing, email and so forth, you are probably looking for something that is faster rather than tons of storage. A hard drive size of 320 GB would probably be enough, but usually a 500 GB does not cost much more so if you can afford it, buy the bigger size. If you do a lot of gaming or use your computer for business, you may want to purchase the higher capacity at 750 GB.