Computers use hard drives to store data. This could be your personal or work files as well as application software like wordpropcessing and photography packages. The hard drive is essential for the computer to function. Even though we are in a world in rapidly developing technology, the regular computer - desktop computer and laptops - still use the hard drive as storage media.
Hard drives are often abbreviated as HD or HDD. It functions as a memory device and is known in the computing world as permanent storage. It stores data that is retrievable.
When buying a hard drive for your system, you will first need to determine whether you need one for a desktop computer or a laptop, internal or external. After identifying what type you need, it is important at this stage to verify what type of connection is appropriate for you - it could be ATA (old technology), or SATA.