THERE ARE THREE DIFFERENT TYPES OF SECONDARY STORAGE
We are going to over all three.
What they are mainly for
External or portable hard drives are mostly for use when you need to transfer or store more than 2 GB of information. For 2 GB and under, a flash drive is more convenient.
The speed of this is 3 Gb/s and the cost is cheap(ish )Hard drive is where all your documents and data from your computer are stored. It is the computers long term memory.
The size of a hard drive is measured in gigabytes (Gb), The larger the hard drives size, the more information it can store. A computer can have several hard drives installed in order to boost its storage capacity, allowing you to store more, documents, music, videos and games within your computer.