Storage

Explain what a storage device is Define the two storage operations Define what a hard disk is and list the types Define what a CD and DVD are. List ways to properly care for CD’s and

DVD’s. Give examples of miniature storage

devices. Explain what a card reader is Explain what micro-fiche and film are.

Storage holds data, instructions, and information for future use

Consists of two parts

Storage Device

Storage Media

Storage is nonvolatile where as RAM memory is volatile

Two operations associated with storage Reading - Process of transferring items

from storage media to memory Writing - Process of transferring items from

memory to storage media

High-capacity storage consisting of several inflexible, circular platters that store items electronically

Components enclosed in airtight, sealed case for protection

InternalExternal

Removable

Flat, round, portable metal discs made of metal, plastic, and lacquer

Can be read only or read/write Most PCs include CD or DVD drive, most

play audio CDs Are not re-writable

disc label

laserdiode

disc label

laserdiode

prism

disc label

laserdiode

prism

lens

disc label

laserdiode

prismlight-

sensingdiode

lens

disc label

laserdiode

prismlight-

sensingdiode

lenspit

disc label

laserdiode

prismlight-

sensingdiode

lenspit land

disc label

Items waiting to be interpretedand executed by the processor

Memory (most RAM)

Primary Storage

Secondary StorageOperating system, applicationsoftware, user data and information

Hard Disk

Software, backups, movies, music

CDs and DVDs

Digital pictures or small files tobe transported

Miniature Storage Media

BackupsTape

Small files to be transportedFloppy Disk

Do not expose the disc to excessive heat or sunlight

Do not eat, smoke, or drink near a disc Do not touch the underside of the disc Do not stack discs Store disc in a jewel box when not in

use Hold disc by its edges

Smart Media

xD Picture Card

Compact Flash Secure Digital

Memory Stick Microdrive

And externals device that reads information stored on miniature mobile storage media

Store microscopic images of documents on a roll or a sheet of film

Images recorded using a computer output microfilm (COM) recorder

Magnetic Disks 3 to 5 Years 20 to 30 years

CD’s and DVD’s 5 to 10 Years 50 to 100 years

Microfilm 100 years 500 years

Media Type Guaranteed PotentialLife LifeExpectancy Expectancy