Chapter07

Chapter 7 Objectives Differentiate between storage devices and storage media Describe the characteristics of magnetic disks Describe the characteristics of a hard disk Discuss various types of miniature, external, and removable hard disks Describe the characteristics of optical discs Differentiate among CD-ROMs, recordable CDs, rewritable CDs, DVD-ROMs, BD-ROMs, HD DVD-ROMs, recordable DVDs, and rewritable DVDs Identify the uses of tape Discuss PC Cards, ExpressCard modules, and the various types of miniature storage media Identify uses of microfilm and microfiche Next

Storage ,[object Object],p. 354 - 355 Fig. 7-1 ,[object Object],[object Object],[object Object],Next

Storage ,[object Object],p. 356 ,[object Object],Next 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

Storage ,[object Object],p. 356 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) Next Memory (most RAM) (chips on motherboard) Screen Display

Storage ,[object Object],Writing Process of transferring items from memory to storage media p. 356 Reading Process of transferring items from storage media to memory Hardware that records and retrieves items to and from storage media Next Functions as source of input Creates output

Storage ,[object Object],p. 357 Fig. 7-4 ,[object Object],[object Object],faster transfer rates slower transfer rates Floppy Disk Small files to be transported Secondary Storage Primary Storage Hard Disk Flash Memory Cards and USB Flash Drives CDs and DVDs Tape Items waiting to be interpreted and executed by the processor Operating system, application software, user data and information Digital pictures or files to be transported Software, backups, movies, music Backups Memory (most RAM) Stores … Transfer rates Next

Magnetic Disks ,[object Object],p. 357 Fig. 7-5 ,[object Object],Next Track is narrow recording band that forms full circle on disk ,[object Object]

Magnetic Disks ,[object Object],p. 358 Fig. 7-6 hard disk mounted in system unit ,[object Object],[object Object],[object Object],Perpendicular recording Next Click to view Web Link, click Chapter 7, Click Web Link from left navigation, then click Perpendicular Recording below Chapter 7 Longitudinal recording

Magnetic Disks ,[object Object],p. 359 Fig. 7-7 actual disk capacity Next Sample Hard Disk Characteristics Advertised capacity 500 GB Platters 4 Read/write heads 8 Cylinders 16,383 Bytes per second 512 Sectors per track 63 Sectors per drive 973,773,168 Revolutions per minute 7,200 Transfer rate 300 MB per second Access time 8.5 ms

Magnetic Disks ,[object Object],p. 360 Fig. 7-8 Step 1. Circuit board controls movement of head actuator and a small motor. Step 2. Small motor spins platters while computer is running. Step 3. When software requests a disk access, read/write heads determine current or new location of data. Step 4. Head actuator positions read/write head arms over correct location on platters to read or write data. Next

Magnetic Disks ,[object Object],p. 360 Fig. 7-9 ,[object Object],[object Object],platter read/write head platter sides cylinder track sector Next

Magnetic Disks ,[object Object],p. 360-361 Fig. 7-10 ,[object Object],[object Object],[object Object],[object Object],Next

Magnetic Disks ,[object Object],p. 361 Fig. 7-11 ,[object Object],Next second request for data—to hard disk first request for data—to disk cache

Magnetic Disks ,[object Object],p. 362 ,[object Object],[object Object],Next Click to view Web Link, click Chapter 7, Click Web Link from left navigation, then click RAID below Chapter 7

Magnetic Disks ,[object Object],p. 362 Fig. 7-13 ,[object Object],[object Object],[object Object],Next Click to view Web Link, click Chapter 7, Click Web Link from left navigation, then click Pocket Hard Drives below Chapter 7

Magnetic Disks ,[object Object],p. 363 Fig. 7-14 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],Next

Magnetic Disks ,[object Object],p. 363 - 364 SCSI controller supports up to fifteen devices including hard disks, CD and DVD drives, tape drives, printers, scanners, network cards SATA ( Serial Advanced Technology Attachment ) controller uses serial signals to transfer data, instructions, and information Next EIDE ( E nhanced I ntegrated D rive E lectronics) controller supports four hard disks, provides connections for CD and DVD drives Chip and circuits that control transfer of items from disk

Magnetic Disks ,[object Object],p. 364 - 365 Fig. 7-15 ,[object Object],[object Object],[object Object],[object Object],Next Click to view Web Link, click Chapter 7, Click Web Link from left navigation, then click Online Storage below Chapter 7

Magnetic Disks ,[object Object],p. 365 Fig. 7-16 ,[object Object],[object Object],Next

Optical Discs ,[object Object],Push the same button to close the tray. p. 366 Fig. 7-17 ,[object Object],[object Object],[object Object],Insert the disc, label side up. Push the button to slide out the tray. Next

Optical Discs ,[object Object],p. 367 Fig. 7-18 Step 1. Laser diode shines a light beam toward disc. Step 2. If light strikes a pit, it scatters. If light strikes a land, it is reflected back toward diode. Next laser diode laser diode prism prism light- sensing diode light- sensing diode 0 1 lens lens pit land disc label Step 3. Reflected light is deflected to a light-sensing diode, which sends digital signals of 1 to computer. Absence of reflected light is read as digital signal of 0.

Optical Discs ,[object Object],p. 367 Fig. 7-19 ,[object Object],[object Object],single track spirals to edge of disc disc sectors Next

Optical Discs ,[object Object],p. 368 Fig. 7-20 Next

Optical Discs ,[object Object],p. 369 Fig. 7-22 ,[object Object],[object Object],[object Object],[object Object],Next Click to view Web Link, click Chapter 7, Click Web Link from left navigation, then click CD-ROMs below Chapter 7

Optical Discs ,[object Object],p. 369 75X Ranges from 48X to 75X or faster 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 Next

Optical Discs ,[object Object],p. 370 Fig. 7-23 Step 3. At home, print images from Picture CD on your ink-jet photo printer. At a store, print images to Picture CD at kiosk. Step 1. Drop off film to be developed. Mark the Picture CD box on the film-processing envelope. Step 2. When you pick up prints and negatives, a Picture CD contains digital images of each photograph. Next Film developers offer Picture CD service Can be modified using photo editing software Stores digital versions of roll of film Click to view Web Link, click Chapter 7, Click Web Link from left navigation, then click Picture CDs below Chapter 7

Optical Discs ,[object Object],p. 370 - 371 Must have CD recorder or CD-R drive Cannot erase disc’s contents CD-R ( c ompact d isc- r ecordable) — 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 Next Click to view Web Link, click Chapter 7, Click Web Link from left navigation, then click CD-Rs and CD-RWs below Chapter 7

Optical Discs Video: Got Your Video Right Here Next CLICK TO START

Optical Discs ,[object Object],p. 372 Fig. 7-24 ,[object Object],[object Object],[object Object],[object Object],[object Object],Next

Optical Discs ,[object Object],p. 372 - 373 Fig. 7-25 ,[object Object],[object Object],[object Object],[object Object],[object Object],Next Click to view Web Link, click Chapter 7, Click Web Link from left navigation, then click Blu-ray and HD DVD below Chapter 7

Tape ,[object Object],p. 374 Fig. 7-27 ,[object Object],[object Object],Next

Tape ,[object Object],p. 374 ,[object Object],[object Object],[object Object],Next

PC Cards and ExpressCard Modules ,[object Object],p. 374 Figs. 7-28 ,[object Object],[object Object],Next

Miniature Mobile Storage Media ,[object Object],p. 375 Fig. 7-29 ,[object Object],Next

Miniature Mobile Storage Media ,[object Object],p. 376 Fig. 7-30 Next Click to view Web Link, click Chapter 7, Click Web Link from left navigation, then click Flash Memory Cards below Chapter 7 CompactFlash Secure Digital xD Picture Card Memory Stick Memory Stick PRO Duo

Miniature Mobile Storage Media ,[object Object],p. 377 Fig. 7-31 Next

Miniature Mobile Storage Media ,[object Object],p. 377 Fig. 7-32 ,[object Object],[object Object],[object Object],Next Click to view Web Link, click Chapter 7, Click Web Link from left navigation, then click USB Flash Drives below Chapter 7

Miniature Mobile Storage Media ,[object Object],p. 378 Fig. 7-33 ,[object Object],[object Object],Next Click to view Web Link, click Chapter 7, Click Web Link from left navigation, then click Smart Cards below Chapter 7

Microfilm and Microfiche ,[object Object],p. 379 Fig. 7-34 Images recorded using computer output microfilm recorder Store microscopic images of documents on roll or sheet of film Next Microfilm — 100- to 215-foot roll of film Microfiche — small sheet of film, usually 4”  6”

Microfilm and Microfiche ,[object Object],p. 379 Fig. 7-35 ,[object Object],Next

Putting It All Together ,[object Object],p. 380 Fig. 7-37 ,[object Object],[object Object],[object Object],[object Object],[object Object],Next

Putting It All Together ,[object Object],p. 380 Fig. 7-37 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Next

Putting It All Together ,[object Object],p. 380 Fig. 7-37 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Next

Summary of Storage Internal hard disks External and removable hard disks Floppy disks CD-ROMs Recordable and Rewritable CDs DVD-ROMs Blu-ray Discs (BDs) HD DVD discs Recordable and Rewritable DVDs Tape PC Cards and ExpressCard modules Flash memory cards and USB flash drives Chapter 7 Complete Smart cards, microfilm, and microfiche

Chapter07

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Chapter07