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1.    About basic computer hardware
            Every part of your computer is the result of years of research and development. Parts that were once hand made at a cost of thousands of man-hours are now mess produced for a fraction of a rupee. Computer parts can be divided in to two groups, hardware and software.
Hardware is any part of the computer that you can touch. The seeming miles of wires that get tangled on your desk, the CD drive, the monitor are all hardware. Soft ware is a set of electronic instructions consisting of complex codes (programs) that make the computer perform tasks. Windows is a software, so is any other  program that runs on your computer.

2.    Secondary storage ( external storage devices)
         Floppy diskettes, hard disk, tapes and optical disks come under the category of external storage devices or ancillary storage devices. These devices are very sensitive to environmental conditions (humidity and temperature) as well as to external magnetic fields and need to be stored carefully. They are not compulsory for the functioning of the computer but are useful for expanding the computer's memory.

(A)    Floppy disk
            Floppy disk are primarily used on PCs. Information on a floppy disk is recorded in the magnetized states of particles of iron oxides  evenly placed upon concentric circles known as tracks.

(B)    Hard disk
    It is a non removable enclosed magnetic disk included in most PCs. It contains a stack of metal platters, each coated with iron oxide, that spin on a spindle and the entire unit is encased chamber.

(C)    USB
            A USB flash drive, also commonly known as a USB stick and a variety of other names. It is a data storage device that includes flash memory with an interface. USB flash drives are typically removable and rewritable, and physically much smaller than an optical disc.