Chapter 7 StorageChapter 7 ContentsStorageSlide 4Slide 5Slide 6Slide 7Magnetic Disks : use magnetic particlesSlide 9Magnetic DisksSlide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Optical DiscsSlide 23Slide 24Slide 25Slide 26Slide 27Slide 28Slide 29TapeSlide 31PC Cards and ExpressCard ModulesMiniature Mobile Storage MediaSlide 34Slide 35Slide 36Microfilm and MicroficheSlide 38Putting It All TogetherSlide 40Slide 41Slide 42Slide 43Summary of StorageDiscovering Computers 2009Chapter 7StorageChapter 7 ContentsMagnetic DisksMagnetic DisksOptical DisksOptical DisksTapeTapePC Cards and Expresscard modulesPC Cards and Expresscard modulesMiniature mobile storage mediaMiniature mobile storage mediaMicrofilm and MocroficheMicrofilm and MocroficheEnterprise storageEnterprise storagePutting it all togetherPutting it all togetherStorageStorageStorageWhat is __________?p. 354 - 355 Fig. 7-1Holds data, instructions, and information for future use_______________ is physical material used for storageAlso called secondary storageStorageWhat is ______________?p. 356Kilobyte (KB) 1 thousandMegabyte (MB) 1 millionGigabyte (GB) 1 billionTerabyte (TB) 1 trillionPetabyte (PB) 1 quadrillionNumber of bytes (characters) a storage medium can holdExabyte (EB) 1 quintillionZettabyte (ZB) 1 sextillionYottabyte (YB) 1 septillionStorage Medium(hard disks, CDs, DVDs,USB flash drives, etc.)StorageHow does volatility compare?p. 355 - 356NonvolatileStorage medium is ____________—contents retained when power is offContents Contents retainedretainedContents Contents available to useravailable to userMemory(most RAM)(chips on motherboard)Screen DisplayON OFFVolatileDisplay Display disappearsdisappearsData andData andinstructions instructions available to useravailable to userDisplay Display appearsappearsData and Data and instructions erasedinstructions erasedMemory is ________—holds data and instructions temporarilyWritingWritingProcess of transferring Process of transferring items from memory items from memory to storage mediato storage mediaWritingWritingProcess of transferring Process of transferring items from memory items from memory to storage mediato storage mediaStorageWhat is a ________________?p. 356ReadingReadingProcess of transferring Process of transferring items from storage items from storage media to memorymedia to memoryReadingReadingProcess of transferring Process of transferring items from storage items from storage media to memorymedia to memoryHardware that Hardware that records and records and retrieves items retrieves items to and from to and from storage mediastorage mediaFunctions as source of input Creates outputStorageWhat is _____________?p. 357 Fig. 7-41. Time it takes storage device to locate item on storage medium2. Time required to deliver item from memory to processorThe speed of storage devices and memory measuringMagnetic Disks : use magnetic particlesp. 357 Fig. 7-5What are ______ and ________?________is narrow recording bandthat forms fullcircle on disk__________stores up to512 bytesof dataMagnetic Disks : use magnetic particlesp. 357 Fig. 7-5A_______________________is the smallest unit of disk space that stores data and information, and consists of two to eight sectorsFor reading and writing purposes, sectors are grouped into _______________.Even if a file consists of only a few bytes, it uses an entire cluster.Each cluster holds data from only one file, but one file can span many clusters.Perpendicular recordingMagnetic DisksWhat is a ______________?p. 358 Fig. 7-6High-capacity storageConsists of several inflexible, circular platters that store items electronicallyComponents enclosed in airtight, sealed case for protectionLongitudinal recordingMagnetic DisksWhat are characteristics of a hard disk? p. 359 Fig. 7-7Sample Hard Disk CharacteristicsAdvertised capacity 500 GBPlatters 4Read/write heads 8Cylinders 16,383Bytes per second 512Sectors per track 63Sectors per drive 973,773,168Revolutions per minute 7,200Transfer rate 300 MBpsAccess time 8.5 msactualdiskcapacityMagnetic DisksHow does a hard disk work?p. 360 Fig. 7-8Magnetic DisksWhat is a _________?p. 360 Fig. 7-9Vertical section of track through all plattersSingle movement of read/write head arms accesses all plattersin ________Top view of platterread/writeheadplattersidestracksectorside view of plattercylinderMagnetic DisksWhat is a ___________?p. 360-361 Fig. 7-10Usually resultiing in a loss of data or sometimes loss of the entire driveSpinning creates cushion of air that floats read/write head above platterOccurs when read/write head touches platter surfaceMagnetic DisksWhat is a _____________?p. 361 Fig. 7-11Portion of memory that processor uses to store frequently accessed itemssecond requestfor data—to hard diskfirst requestfor data—to disk cacheMagnetic DisksWhat is _________?p. 362Redundant Array of Independent DisksA group of two or more integrated hard disksConnects multiple smaller disks into a single unit that acts as a single large hard diskMagnetic DisksWhat is a ______________________?p. 362 Fig. 7-13Provide greater storage capacities than flash memorySmaller than notebook computer hard disksA __________________, as another type of miniature hard disk, is a self-contained unitMagnetic DisksWhat are _______hard disks and ______________hard disks?p. 363 Fig. 7-14__________ hard disk—freestandinghard disk that connects to system unit__________hard disk—hard diskthat you insert and removefrom hard disk driveUsed to back up or transfer filesSASSAScontroller supports many connectedcontroller supports many connecteddevices at once, including hard disks,devices at once, including hard disks,CD and DVD drives, printers,CD and DVD drives, printers,scanners, digital cameras, and morescanners, digital cameras, and moreEIDEEIDE (EEnhancednhanced IIntegratedntegrated DDrive rive EElectronics) controller supports four lectronics) controller supports four hard disks, provides connections for hard disks, provides connections for CD and DVD drivesCD and DVD drivesMagnetic DisksWhat is a _________________?p. 363 - 364SCSISCSIcontroller supports up to fifteencontroller supports up to fifteendevices including hard disks, CDdevices including hard disks, CDand DVD drives, tape drives, and DVD drives, tape drives, printers, scanners, network cardsprinters, scanners, network cardsSATASATA (Serial Advanced