Microsoft Office 2007 – Illustrated Introductory, Windows Vista Edition Understanding Essential Computer Concepts

2 Microsoft Office 2007-Illustrated Introductory, Windows Vista Edition Understanding Storage Media Magnetic storage devices Store data as magnetized particles on mylar, which is then coated on both sides with a magnetic oxide coating

3 Microsoft Office 2007-Illustrated Introductory, Windows Vista Edition Understanding Storage Media Common magnetic storage devices hard disks— several magnetic oxide covered metal platters usually sealed in a case inside the computer tape— inexpensive, slow, archival storage for large companies who need to back up large quantities of data. floppy disks— flat circles of magnetic oxide-coated mylar enclosed in a hard plastic case; almost obsolete

4 Microsoft Office 2007-Illustrated Introductory, Windows Vista Edition Understanding Storage Media Optical storage devices polycarbonate discs coated with a reflective metal on which data is recorded using laser technology as a trail of tiny pits or dark spots in the surface of the disc the data that these pits or spots represent can then be “read” with a beam of laser light

5 Microsoft Office 2007-Illustrated Introductory, Windows Vista Edition Understanding Storage Media Types of optical storage devicesTypes of optical storage devices CD—can store 700 MB of dataCD—can store 700 MB of data DVD—can store between 4.7 and 15.9 GB of dataDVD—can store between 4.7 and 15.9 GB of data Blu-ray discs and HD-DVD can store between 15 and 50 GB of dataBlu-ray discs and HD-DVD can store between 15 and 50 GB of data

6 Microsoft Office 2007-Illustrated Introductory, Windows Vista Edition Understanding Storage Media Flash memory—similar to ROM except that it can be written to more than once. Flash memory cards small, portable cards encased in hard plastic to which data can be written and rewritten used in digital cameras, handheld computers, video game controllers, and other devices

7 Microsoft Office 2007-Illustrated Introductory, Windows Vista Edition Understanding Storage Media USB flash storage device (USB drive, flash drive) popular type of flash memory available in a wide range of sizes from 32 MB to 16 GB plug directly into the USB port of a personal computer are about the size of a pack of gum and often have a ring that you can attach to your key chain.

8 Microsoft Office 2007-Illustrated Introductory, Windows Vista Edition Erasing and Rewriting on CDs and DVDs CD-ROMs are for “read-only” access.CD-ROMs are for “read-only” access. CD-R drives allow you to record data on a CD-R disk.CD-R drives allow you to record data on a CD-R disk. CD-RW drives allow you to write data on a CD-RW disk and access and modify data.CD-RW drives allow you to write data on a CD-RW disk and access and modify data. DVD-R and DVD+R are recordable.DVD-R and DVD+R are recordable.

9 Microsoft Office 2007-Illustrated Introductory, Windows Vista Edition Exploring Data Communications Data communications is the transmission of text, numeric, voice, or video data from one computer to another. The four essential components of data communications are: SenderSender ChannelChannel ReceiverReceiver ProtocolsProtocols

10 Microsoft Office 2007-Illustrated Introductory, Windows Vista Edition Exploring Data Communications A sender is the computer that originates the message.A sender is the computer that originates the message. The message is sent over a channel, such as a telephone.The message is sent over a channel, such as a telephone. The receiver is the computer at the message’s destination.The receiver is the computer at the message’s destination. Protocols are the rules that establish the transfer of data between sender and receiver.Protocols are the rules that establish the transfer of data between sender and receiver.