#1 Theory 8 Unit 8 Storage Devices Storage Devices

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Unit 8Unit 8

Storage DevicesStorage Devices

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PurposesPurposes

•Need non-volatile sourceNeed non-volatile source•Keep for later useKeep for later use•Transport to another Transport to another

place/computerplace/computer•Retain for archiveRetain for archive

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Types of Storage DevicesTypes of Storage Devices

•Floppy DiskFloppy Disk•Hard DiskHard Disk•CD-ROMCD-ROM•Back up DevicesBack up Devices

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Floppy DiskFloppy Disk

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Floppy Drive TypesFloppy Drive Types

•5.25” floppy disk (old)5.25” floppy disk (old)•3.5” floppy disk (now)3.5” floppy disk (now)

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Floppy Drive EquipmentFloppy Drive Equipment

•Disk driveDisk drive•DiskettesDiskettes

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Traditional UsesTraditional Uses

• Install New Programs Install New Programs (changing now)(changing now)

•Transfer dataTransfer data• Increase Hard Disk SpaceIncrease Hard Disk Space•Back Up DataBack Up Data

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Evolving UsesEvolving Uses

• Install small programs Install small programs onlyonly

•Transfer small amount of Transfer small amount of datadata

•(Other equipment (Other equipment replacing floppies!)replacing floppies!)

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Floppies SpecificationsFloppies Specifications

•CapacityCapacity–Double-Density Double-Density (DS/DD)(DS/DD)

–High-Density (HD)High-Density (HD)•Pre-formattedPre-formatted

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Protecting a FloppyProtecting a Floppy

•Write protectionWrite protection•Store in containerStore in container•Protect from environmentProtect from environment

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Hard diskHard disk

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Note Regarding TermsNote Regarding Terms

•DiskDisk•DriveDrive•Used interchangeably!Used interchangeably!

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Hard Disk EquipmentHard Disk Equipment

•Hard disk enclosed in Hard disk enclosed in protective shellprotective shell

•Software to formatSoftware to format•No external access!No external access!

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Uses of Hard DriveUses of Hard Drive

•Store filesStore files–Program FilesProgram Files–Data FilesData Files

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Storing ProcessStoring Process

•Computer: controller Computer: controller •UserUser

–Create folders by topicCreate folders by topic–(Subdirectory)(Subdirectory)

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Hard Drive SpecificationsHard Drive Specifications

•Capacity (Mb, Gb)Capacity (Mb, Gb)•Average Access Time Average Access Time

(ms)(ms)

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Connection TypesConnection Types

• IDE (older)IDE (older)•EIDE (newer)EIDE (newer)•SCSI (high end)SCSI (high end)

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Purposes of Disk CachePurposes of Disk Cache

•Speeds up computerSpeeds up computer•Stores recently used dataStores recently used data•Updated constantlyUpdated constantly

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Create More Disk SpaceCreate More Disk Space

•Archive unneeded Archive unneeded informationinformation

•Delete filesDelete files•Compress dataCompress data

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Hard Drive MaintenanceHard Drive Maintenance

•Optimize...Optimize...•Virus...Virus...•Back Up Data...Back Up Data...

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Optimize a Hard DriveOptimize a Hard Drive

•Defragment a driveDefragment a drive•Scan disk to repair a driveScan disk to repair a drive

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Ways to Get a VirusWays to Get a Virus

•Shared floppy diskShared floppy disk•Modem/InternetModem/Internet•Shareware programsShareware programs

•Protect with: Anti-Virus Protect with: Anti-Virus ProgramProgram

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Back Up DataBack Up Data

•Back up data filesBack up data files•Back up frequentlyBack up frequently

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Removable Hard DrivesRemovable Hard Drives

•(Back up option)(Back up option)•Archive DataArchive Data•Protect DataProtect Data•Transfer DataTransfer Data

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CD-ROMCD-ROM

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CD-ROM EquipmentCD-ROM Equipment

•CD-ROM DriveCD-ROM Drive•SoftwareSoftware•CD-ROM DiscCD-ROM Disc

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Uses for CDsUses for CDs

• Install softwareInstall software•Run program from CDRun program from CD•Any multimedia Any multimedia

applicationapplication•Play Music CDsPlay Music CDs

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Programs on CDsPrograms on CDs

• ChildrenChildren• EducationEducation• GamesGames• ReferenceReference

• General General InterestInterest

• Time-Time-Sensitive Sensitive informationinformation

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Factors in CD-ROMsFactors in CD-ROMs

•SpeedSpeed•Average Access TimeAverage Access Time•Multisession (read info Multisession (read info

stored over other info!)stored over other info!)

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Using the CD-ROMUsing the CD-ROM

•Insert in trayInsert in tray•Handle from edgesHandle from edges•Use jewel caseUse jewel case

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New CD-ROM ItemsNew CD-ROM Items

•Recordable CDsRecordable CDs•DVD-ROMDVD-ROM

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Backup DevicesBackup Devices

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Traditional Tape DriveTraditional Tape Drive

•Drive unitDrive unit•SoftwareSoftware•Cartridges ($$)Cartridges ($$)

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Tape DriveTape Drive

•Tape cartridgesTape cartridges•ApplicationsApplications

–Back up dataBack up data–Archive dataArchive data–Transfer dataTransfer data

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Other DevicesOther Devices

•TraditionalTraditional–QIC DriveQIC Drive–Travan DriveTravan Drive–DAT DriveDAT Drive

•NewNew–Zip DriveZip Drive

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Backup TipsBackup Tips

•Schedule Backups -- like Schedule Backups -- like brushing your teethbrushing your teeth

•Data CompressionData Compression•Record date of purchaseRecord date of purchase

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Types of BackupsTypes of Backups

•FullFull• IncrementalIncremental