Computer Hardware

Karl Meakin

Hard Drive HDD/SSD

The hard drive controls the memory of a computer. Without one, you wouldn't be able to store documents, programs, websites or anything else.

There are two types of hard drive: A Hard Disk Drive(HDD) and a Solid State Drive(SSD).

A HDD stores more memory than a SSD, and is much cheaper. However, they are slower to respond to instructions, and have a moving arm and disk to read and save information, which can be broken if dropped or damaged.The arm loads infomation by reading the bumps in the disk that store the infomation.To save information, the arm creates more bumps.

A SSD stores less memory than a HDD, but it is smaller, it responds faster and has no moving parts.It stores infomation digitally without a disk.

Optical Drive

The optical drive reads (and most drives can write) infomation on a disk, such as a CD, DVD or Blu-Ray disk. It works similar to a Hard Disk Drive by reading the bumps on the disk, but it uses a laser instead of an arm. Some ultra-thin laptops, such as a Macbook Air, don't have optical drives to save space.


A monitor acts like the screen of a TV. The difference between a monitor and a TV screen is that a TV has an antena to receive channels.There are two types of monitor:

Cathode Ray Tube: This works by firing electrons down a tube at the monitor, this makes it light up with a certain colour of light depending on how much electronic charge is in the electron. These are very large and bulky and use up alot of electricity.


The CPU (central processing unit) is the brain of the computer. It is the brain of the computer. It carries out all the calculations required to get work done. The speed of the processor is messured in Hertz. One Hertz is equal to one calculation per second.