ITBIS105 5

Chapter 3 Storage ITBIS 105 : Elementary Computing

Storage ,[object Object],[object Object],[object Object],[object Object]

Storage ,[object Object],Nonvolatile ,[object Object],Contents retained Contents available to user ON OFF Volatile Display disappears Data and instructions available to user Display appears Data and instructions erased ,[object Object],Storage Medium (floppy disks, Zip disks, hard disks, CDs) Memory (most RAM) (chips on motherboard) Screen Display

Bits and Bytes: The Language of Computers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Copyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall

Storage ,[object Object],Writing Process of transferring items from memory to storage media Reading Process of transferring items from storage media to memory Hardware that records and retrieves items to and from storage media  Hardware that records and retrieves items to and from a storage medium. Examples are Floppy drive, Hard disk drive etc. Functions as source of input Creates output

Storage ,[object Object],[object Object],Kilobyte (KB) 1 thousand Megabyte (MB) 1 million Gigabyte (GB) 1 billion Terabyte (TB) 1 trillion Petabyte (PB) 1 quadrillion Exabyte (EB) 1 quintillion

Floppy Disks ,[object Object],[object Object],[object Object],shutter shell liner magnetic coating flexible thin film metal hub

Floppy Disks ,[object Object],Floppy disk drive built into a desktop computer External floppy disk drive attaches to a computer with a cable ,[object Object],[object Object],[object Object]

Floppy Disks ,[object Object],[object Object],Track is narrow recording band that forms full circle on disk ,[object Object]

Floppy Disks ,[object Object], Tracks are configured in concentric circles in which data are stored.  PC disks use sector organization to store and retrieve data. The recording surface is divided into sectors (a disk-storage concept of a pie-shaped portion of a disk or diskette in which records are stored and subsequently retrieved).

Floppy Disks Never open the shutter and touch the disk’s surface How do you care for a floppy? Avoid exposure to heat and cold Avoid exposure to magnetic fields Avoid exposure to contaminants such as dust, smoke, or salt air Keep disks in a storage tray when not using them ,[object Object],[object Object]

Zip Disks ,[object Object],[object Object],[object Object],[object Object],[object Object],c External Zip drive Zip disk

Hard Disks ,[object Object],hard disk installed in system unit ,[object Object],[object Object],[object Object]

Hard Disks ,[object Object],External hard disk —freestanding hard disk that connects to system unit Removable hard disk —hard disk that you insert and remove from hard disk drive ,[object Object]

CDs and DVDs ,[object Object],Push the same button to close the tray. ,[object Object],[object Object],[object Object],Insert the disc, label side up. Push the button to slide out the tray.

CDs and DVDs ,[object Object],[object Object],[object Object],[object Object],[object Object]

CDs and DVDs ,[object Object], CD-ROM stands for compact disc-read-only memory.  Once inserted in the CD-ROM drive, the text, video images, and so on can be read into RAM for processing or display.  The data on the disk are fixed-they cannot be altered. This is in contrast to the read/write capabilities of magnetic disks.  What makes CD-ROM so inviting is its vast capacity to store data and programs. The capacity of a single CD-ROM is up to 680 MB-about that of 477 diskettes.

CDs and DVDs ,[object Object],Must have CD recorder or CD-R drive Cannot erase disc’s contents CD-R ( c ompact d isc- r eadable) — c disc you can write on once CD-RW ( c ompact d isc- r e w ritable) — ce erasable disc you can write on multiple times Must have CD-RW software and CD-RW drive

CDs and DVDs ,[object Object],DVD DVD drive ,[object Object],[object Object],[object Object]

CDs and DVDs ,[object Object], DVDs are poised to replace CD-ROMs. The DVD (digital videodisk) looks like the CD and the CD-ROM, but it can store from 7 to 14 times as mush information (up to about 10 GB). A DVD can store the video for a full-length movie.  DVD drives are back-wards compatible; that is, they can play all of your CD-ROM and CDs. DVDs probably will replace videotapes and CDs in a few years

CDs and DVDs ,[object Object],[object Object],[object Object],single track spirals to edge of disc disc sectors

Tape ,[object Object],[object Object],[object Object]

Tape ,[object Object],[object Object],[object Object],[object Object]

Miniature Mobile Storage Media ,[object Object],[object Object],Miniature mobile storage media

Miniature Mobile Storage Media ,[object Object],Smart Media Secure Digital Microdrive ™ USBDrive ™ Memory Stick ® CompactFlash

Setting It All Up: Ergonomics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Copyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall

Ergonomics and Mobile Devices Copyright © 2010 Pearson Education, Inc. Publishing as Prentice Hall Mobile devices present ergonomic challenges Ergonomic “Disease” Cause Blackberry thumb Thumb typing without breaks or stretching can cause DeQuervains’ tendinitis in the thumbs. iPod deafness Listening through ear buds for prolonged periods at a volume of 80 decibels or more can cause deafness. Cellular blindness Extended viewing on tiny screens can cause eye strain and/or dry eyes. Laptop thighs Resting a laptop directly on your lap for extended periods of time can result in 1 st and 2 nd degree burns. Laptop shoulder Large, heavy, one-strap laptop bags can result in neck, shoulder, and back pain and/or strain.

ITBIS105 5

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