Storage 101 Mr. Yip. What is Storage? Input Processing Output Storage Storage refers to the media and methods used to keep information available for later.

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Presentation transcript:

Storage 101 Mr. Yip

What is Storage? Input Processing Output Storage Storage refers to the media and methods used to keep information available for later use. Some things will be needed right away while other won't be needed for extended periods of time. So different methods are appropriate for different uses.

Storage vs Memory Are both measured in kilobytes, megabytes and gigabytes With memory the info is stored electronically on chips Storage is saved on media, either magnetically on disks or tapes or optically on disks (CD/DVD)

Types of Storage - Magnetic Devices magnetic disk come in various sizes and materials. This method uses magnetism to store the data on a magnetic surface. Diskette / Floppy Disk 5¼”3½"

Types of Storage Hard Drive Consist of 1 or more metal platters which are sealed inside a case. The metal is one which is magnetic.

Magnetic Storage Device StepMeasured as: 1. seek move the head to proper track seek time (ms) 2. rotate rotate disk under the head to the correct sector rotational delay (ms) 3. settle head lowers to disk; wait for vibrations from moving to stop (actually touches only on floppies) settling time (ms) 4. data transfer copy data to main memory data transfer rate (kbs)

Types of Storage – Optical Disks optical disks include CD and DVD discs. You may guess from the word "optical" that it has to do with light. You'd be exactly right! Laser light, in fact.

How an optical disk work? An optical disc is made mainly of polycarbonate (a plastic). The data is stored on a layer inside the polycarbonate. A metal layer reflects the laser light back to a sensor. To read the data on a disk, laser light shines through the polycarbonate and hits the data layer. How the laser light is reflected or absorbed is read as a 1 or a 0 by the computer.

Types of CD/DVD CD-ROM/ DVD-ROM The most common type CD-ROM, which stands for Compact Disc - Read Only Memory. re. DVD used to stand for Digital Video Device or They can't be changed once they are created.

Types of CD/DVD CD-R/ DVD-R (read) Can only be written once CD-RW/ DVD-RW (rewritable) Can be read and erased

Other Storage devices Flash drive USB drive SD drive Memory sticks