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Chapter 6:Storage

Chapter 6:Storage. Storage. Next. What is storage?. Holds data, instructions, and information for future use. Storage medium is physical material used for storage. Also called secondary storage. p. 220 Fig. 6-1. Storage. Kilobyte (KB). 1 thousand. Megabyte (MB). 1 million.

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Chapter 6:Storage

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  1. Chapter 6:Storage

  2. Storage Next • What isstorage? • Holds data, instructions, and information for future use • Storage mediumis physical material used for storage • Also called secondary storage p. 220 Fig. 6-1

  3. Storage Kilobyte (KB) 1 thousand Megabyte (MB) 1 million Gigabyte (GB) 1 billion Terabyte (TB) 1 trillion Petabyte (PB) 1 quadrillion Exabyte (EB) 1 quintillion Zettabyte (ZB) 1 sextillion Yottabyte (YB) 1 septillion Next • What iscapacity? • Number of bytes (characters) a storage medium can hold p. 222

  4. Magnetic Disks Trackis narrow recording bandthat forms fullcircle on disk Sectorstores up to512 bytesof data Next System Defrag • What aretracks andsectors? Formatting prepares disk for use and marks bad sectors as unusable p. 222 Fig. 6-3

  5. Magnetic Disks Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation, then click Hard Disksbelow Chapter 6 Next hard disk installedin system unit • What is ahard disk? • High-capacity storage • Consists of several inflexible, circular platters that store items electronically • Components enclosed in airtight, sealed case for protection p. 224 Fig. 6-6

  6. Magnetic Disks Sample Hard Disk Characteristics Advertised capacity 120 GB Platters 3 Read/write heads 6 Cylinders 16,383 Bytes per second 512 Sectors per track 63 Sectors per drive 234,441,648 Revolutions per minute 7,200 Transfer rate 133 MB per second Access time 8.9 ms Next • What are characteristics of a hard disk? actualdiskcapacity p. 225 Fig. 6-7

  7. Magnetic Disks Next • What areexternal hard disksandremovable hard disks? • Used to back up or transfer files Removable hard disk—hard diskthat you insert and removefrom hard disk drive External hard disk—freestandinghard disk that connects to system unit p. 227 Fig. 6-12

  8. Magnetic Disks Next • What is online storage? • Service on Web that provides storage for minimal monthly fee • Files can be accessed from any computer with Web access • Large files can be downloaded instantaneously • Others can be authorized to access your data p. 228 Fig. 6-13

  9. Optical Discs Next • What areoptical discs? Push the button toslide out the tray. • Flat, round, portable metal discs made of metal, plastic, and lacquer • Can be read only or read/write Insert the disc,label side up. • Most PCs include an optical disc drive Push the same buttonto close the tray. p. 229 Fig. 6-14

  10. Optical Discs Next • How should you care for an optical disc? Do not exposethe disc to excessiveheat or sunlight Do store thedisc in a jewelbox whennot in use Do noteat, smoke, ordrink neara disc Do not stack discs Do hold a discby its edges Do not touchthe undersideof the disc p. 230 Fig. 6-15

  11. Optical Discs Next • What areCD-Rs and CD-RWs? Must haveCD recorderor CD-R drive CD-R (compact disc-recordable) —cdisc you can write on once Cannot erasedisc’s contents CD-RW (compact disc-rewritable) —ceerasable disc you can write onmultiple times Must haveCD-RW softwareandCD-RW drive p. 232

  12. Optical Discs Click to view Web Link,click Chapter 6, Click Web Linkfrom left navigation, then click DVDs below Chapter 6 Next • What is aDVD-ROM(digital versatile disc-ROM or digital video disc-ROM)? • High capacity disc capable of storing 4.7 GB to 17 GB • Must haveDVD-ROM driveor DVD player to read DVD-ROM • Stores databases, music, complex software, and movies p. 233 Fig. 6-19

  13. Miniature Mobile Storage Media Next • What is aUSB Flash Drive? • Plugs in a USB port on a computer or mobile device • Storage capacities up to 4 GB • May eventually make the floppy disk obsolete p. 236 Fig. 6-25

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