ICT 202 Lecture Notes - Lecture 21: Dvd Recorder, Storage Area Network, Network-Attached Storage
14 Feb 2019
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Document Summary
An optical disc consists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser. Optical discs commonly store items in a single track that spirals from the center of the disc to the edge of the disc. Track is divided into evenly sized sector. A cd-rom can be read but not written to. A cd-r is an optical disc on which users can write once, but not erase. A cd-rw is an erasable multi-session disc. A dvd-rom is a high-capacity optical disc on which users can read but not write on or erase. A dvd-r or dvd+r are competing dvd-recordable worm formats, on which users can write once but not erase. Dvd-rw, dvd+rw and dvd+ram are competing dvd-rewritable formats that users can write on multiple times. Enterprise hardware allows large organizations to manage and store data and information using devices intended for heavy use, maximum efficiency, and maximum availability.
