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STORAGE

STORAGE. PENGANTAR TEKNOLOGI INFORMASI (A). STMIK JAKARTA STI&K 2012. Hard Disks. processor. disk cache. first request for data—to disk cache. second request for data—to hard disk. hard disk. Portion of memory that processor uses to store frequently accessed items.

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STORAGE

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  1. STORAGE PENGANTAR TEKNOLOGI INFORMASI (A) STMIK JAKARTA STI&K 2012

  2. Hard Disks processor disk cache first requestfor data—to disk cache second requestfor data—to hard disk hard disk • Portion of memory that processor uses to store frequently accessed items What is adisk cache?

  3. 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 What areexternal hard disksandremovable hard disks?

  4. Hard Disks EIDE(EnhancedIntegratedDrive Electronics) controller supports four hard disks, provides connections for CD and DVD drives Chip and circuits that control transfer of items from disk SCSI(SmallComputerSystemInterface)controller supports up to fifteendevices including hard disks, CDand DVD drives, tape drives, printers,scanners, network cards What is adisk controller?

  5. Hard Disks • 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 What is anInternet hard drive?

  6. CDs and DVDs 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 CD or DVD drive, most play audio CDs Push the same buttonto close the tray. What areCDs and DVDs?

  7. CDs and DVDs disc label lens lens pit land Step 3.Reflected light is deflected to alight-sensing diode, which sends digital signals of 1 to computer. Absence of reflected light is read as digital signal of 0. 0 1 prism prism light-sensingdiode light-sensingdiode laserdiode laserdiode Step 2.If light strikesa pit, it scatters. If light strikes a land, it is reflected back toward diode. Step 1.Laser diode shines a light beam towarddisc. How does a laser read data on a CD or DVD?

  8. CDs and DVDs • Typically stored in singletrack • Track divided into evenly sizedsectorsthat store items single trackspirals to edgeof disc disc sectors How is data stored on a CD or DVD?

  9. CDs and DVDs 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 How should you care for a CD or DVD?

  10. CDs and DVDs • Compactdiscread-onlymemory • Cannot erase or modify contents • Typically holds 650 MB to 1 GB • Commonly usedto distributemultimedia and complexsoftware What is aCD-ROM?

  11. CDs and DVDs Ranges from 48X to 75X or faster 75X 75  150 KBps = 11,250 KBps or 12.25 MBps 75X is 150 KBps (KB per second) 48X: 48  150 KBps = 7,200 KBps or 7.2 MBps What is the data transfer rate of a CD-ROM drive?

  12. CDs and DVDs Stores digital versions of roll of film Film developers offer Picture CD service Can be modified using photo editing software Step 1.Drop off film to be developed. Mark the Picture CD box on the film-processing envelope. Step 3.At home, print images from Picture CD on your ink-jet photo printer. Step 2.When you pick up prints and negatives, a Picture CD contains digital images of each photograph. At a store, print images to Picture CD at kiosk. What is aPicture CD?

  13. CDs and DVDs Must haveCD recorderor CD-R drive CD-R (compact disc-readable) —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 softwareand CD-RW drive What areCD-Rs and CD-RWs?

  14. CDs and DVDs Step 1.Artist composes a song. Step 2.Song is stored on audio CD andpurchasedby user. Step 5.User listensto song ona personal computer or removes CD and listens to song ona portable CD player. Step 3.User inserts audio CD into CD drive, plays song, and rips desired tracks onto hard disk. Step 4.User copies file to aCD-RW disc. • From a purchased CD. . . How is an audio CD created?

  15. CDs and DVDs Step 1.Artist composes a song. Step 3.User pays for and downloads song as audio file onto a hard disk. Step 2.Song is compressed and stored on the Internet. Step 5.User listensto song ona personal computer or removes CD and listens to song ona portable CD player. Step 4.User copies file to aCD-RW disc. How is an audio CD created? • From the Internet. . .

  16. CDs and DVDs • 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 DVD DVD drive What is aDVD-ROM (digital versatile disc-ROM or digital video disc-ROM)?

  17. CDs and DVDs DVD-ROM Storage Capacities Sides Layers Storage Capacity 1 1 47 GB 1 1 8.5 GB 2 1 9.4 GB 2 2 17 GB • Two layers of pits are used, lower layer is semitransparent so laser can read through • Some are double-sided • DVD+RWis a rewritable DVD • How does a DVD-ROM store data?

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