Hard Disk drive
A hard disk drive also known as a HDD, is a fundamental part of modern computers. The hard drive is where all of your programs and files are stored, so if the drive is damaged for some reason, you will lose everything on your computer. A hard drive uses similar memory storage technology to cassette tapes and video tapes. You may already know that tapes store information on long, thin strips of tape with a delicate magnetic material on its surface. Likewise, hard drives contain round, mirror-like platters that are covered with that same magnetic recording medium.
Memory Stick/Flash drive
A Universal Serial Bus (USB) flash drive is a portable memory chip and circuit board contained in a small plastic case about the size of a thumb, giving rise to the name memory stick. The tiny drive sports a removable cap under which is a USB connector. The chip inside the USB flash drive does not require power to retain data, so batteries are not needed. The drive gets power from the computer, making the USB flash drive a popular choice for transferring files between computers.
CD Rom
CD-ROMs are popularly used to distribute computer software, including video games and multimedia applications, though any data can be stored. Some CDs hold both computer data and audio with the latter capable of being played on a CD player, while data is only usable on a computer. These are called enhanced CDs.
