Do you want to transport movies, music or photos and your USB drive is just not enough? Then, a generous capacity external hard drive will come in handy. Are you planning for a home/office computer upgrade? Then, choose an internal hard drive with a 3.5 inches form factor (for desktop systems and servers) or one with a 2.5 inches form factor (for notebooks). You should pay great attention to the connection interface, so that you can avoid the motherboard incompatibility problems. Depending on the motherboard, you will have to choose a hard disk compatible with the spindle speed and the transfer rate. Moreover, because in the hard disk field "more" means "better", we advise you to choose one with a bigger storage capacity, which will keep you careless of the next upgrade.