By John Gallop
When you save somthing on your computer it goes onto somthing called a hard drive. This is a little box woth a disc inside and an arm that writes the document onto it. This is a rather old fashioned way of saving things and it makes the device rather heavy and the arm can get disorientated and save only parts of your documents.
More moden and up market devices such as the ipad use an ssd (solid state drive) card. This is a smaller, more exnsive, version of hard drive and has no moving parts hense the name. Another benefit to this is that it is alot thinner than a hard drive meaning it can fit in thinner devices such as the ipad, mac book air or iphone.
when you watch a dvd or blu ray or cd the disc is inserted into an optical drive which is a disc player that has a blue lazer that reads off the disc and plays the hd movie. If it is not blu ray then you will have a dvd drive which plays dvds snd cds then you can even have a cd drive which only plays cds
CPUs (Central Processing Units)
A CPU (more commonly known as a processor) is basically the brain of a computer; it makes all the calculations and loads that make it work. It works out what to display and when to change the page. So essentially the more powerful the processor, the faster your computer is.
Devices such as mobile phones and have dual core processors. these are processors that can do two or more things at once. More expensive products such as iPods or tablets have quad core processors wich can evidently can do four things at once.