Chapter 8

Digital storage

Storage

l  A storage medium is the physical material on which a computer keeps data, information, programs, and applications

l  Cloud storage is another storage option, in which the actual online storage media used is transparent to the user

Hard disk

l  A hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information

Flash memory storage

l  Flash memory chips are a type of solid state media and contain no moving parts

l  It has 2 types whivh is SSD (solid state drive) HDD

Cloud storage

l  Cloud storage is an Internet service that provides storage to computer  or mobile device users

Optical disc

l  An optical disc consists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser

l  A DVD-ROM is a high-capacity optical disc on which users can read but not write on or erase

l  A DVD-R or DVD+R are competing DVD-recordable WORM formats, on which users can write once but not erase

l  DVD-RW, DVD+RW, and DVD+RAM are high-capacity rewritable DVD formats

Other Types of Storage

l  A magnetic stripe card contains a magnetic stripe that stores information

l  A smart card stores data on an integrated circuit embedded in the card

l  Radio Frequency Identification (RFID)

l  The RFID tag consists of an antenna and a memory chip that contains the information to be transmitted via radio waves

l  An RFID reader reads the radio signal and transfers the information to a computer or computing device