What are the difference between primary and secondary storage device?

Answer 1

Primary storage is usually the drive where the operating system is and the secondary storage is a additional drive for space.

Usually, Windows names it's primary drive as C:\

and all it's following as other letters.

Answer 2

Primary storage of a computer, also known as its main memory, is used to hold pieces of program instructions and data, intermediate results of processing and recently produced results of those processes on which the computer is currently working. It is volatile in nature i.e. as the power is shut down the data present there are vanished. Its very fast as compared to secondary storage. It has limited storage capacity because it is very expensive. Primary storage of modern computer systems is made of semiconductor devices.

Secondary storage of a computer, also known as its auxiliary storage, is used to take care of the limitations of primary storage. That's, it supplements the limited storage capacity and the volatile characteristic of primary storage. that's because secondary storage is much cheaper than primary storage and it can retain information even when a computer switches off or resets. Secondary storage holds the program instructions, data, and information of those processes on which the computer is currently not working but needs to hold them for processing later. Magnetic disk is the most commonly used secondary storage medium.