4. • a magnetic storage device used in many early
computers as the main working memory
• Invented in Australia.
5. • Equivalent to 10000 punch cards.
• Popular as back up device.
6. • Set of magnetized circular platters.
• 1990’s ,the most popular data storage devices.
7. • A floppy disk is a disk storage medium composed of a disk of thin
and flexible magnetic storage medium encased in a rectangular
plastic carrier. It is read and written using a floppy disk drive (FDD).
• Stored 80 kb data.
• Available in three sizes- 8 inch,5.5 inch,1.44 inch
8. • CD-1980
• DVD-1990,could store 8-10 cd data
• An optical disc is an electronic data storage medium
that can be written to and read using a low-powered
laser beam.
9. • A flash drive is a small piece of equipment
used to store and transfer information for
computers using a USB
10. • Blu-ray or Blu-ray Disc is a digital optical disc data
storage format. It was designed to supersede the DVD
format, and is capable of storing several hours of video
in high-definition and ultra high-definition resolution.
11. • The term "cloud computing" is everywhere. In
the simplest terms, cloud computing means
storing and accessing data and programs over the
Internet instead of your computer's hard drive
