Storage - Hard Drive (HDD)
To store information, you need somewhere to store it. I know that sounds obvious but it is still true. This is called secondary storage (as opposed to primary memory / main memory - RAM)
In a computer the main place to store information is on a hard drive. In modern computers there are two types of "Hard Drive" - The Hard Disk Drive (HDD) and a Solid State Drive (SSD)
HDD
The hard disk drive is made up of several parts - The key ones are the platter (the shiny disk) and the magnetic head (at the tip of the arm reaching over the platter)
Information gets stored on the platter (there can be several of these in the drive). It is stored and read using a magnetic head which moves rapidly over the platter as it spins. It is stored in Binary with a magnetised area standing for a 1 and a non magnetised one standing for a 0. (Click here to learn more about Binary and using it to store data)
Hard drives are typically between 330gb and 4Tb. You can get external drives that plug in and are portable
