Storing Information in a Computer
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Transcript of Storing Information in a Computer
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Chapter 4
Storing Information in a Computer
Peter Norton’s Introduction to Computers
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Learning Objectives:• List four common types of storage devices.
• Name three common uses of floppy disks.
• Name the four data disk areas on floppy and hard disks.
• List three ways tape drives differ from disk drives.
• Identify four types of optical storage devices.
• Name and describe the four main disk drive interface standards.
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Storage Media - the physical components or materials on which data is stored.
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Storage Devices - the hardware components that write data to, and read it from, storage media.
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Types of Storage:
• Magnetic
• Optical
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Magnetic: the bitsare written and read
using magnetism.
Optical: the bitsare read
using light.
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Magnetic Storage Devices:
• Diskettes
• Hard disks
• Removable hard disks
• Magnetic tape
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Tape drive
Floppy drive
Hard drive
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Optical Storage Devices:
• Compact Disk Read-Only Memory
(CD-ROM)
• Write Once, Read Many (WORM)
• Phase-Change Rewritable disks
• Magneto-optical disks
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CD-ROM
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Factors that Affect Drive Performance:
• Average Access Time
• Data-transfer Rate
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Average Access Time - the average time it takes a read/write head to move from one place on the recording medium to any other place on the medium.
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Data-transfer Rate - a measure of how long it takes the device to read or write a given amount of data.
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Hard drive RAM
Head
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Formatting - the process of mapping a diskette by dividing it into Tracks and Sectors.
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Tracks - a set of magnetic concentric circles.
Sector - a pie-like slice of disk.
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Four Areas of a Disk:
• The boot record
• The file-allocation table (FAT)
• The root folder or directory
• The data area
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Drive-Interface Standards:
• Integrated Drive Electronics (IDE)
• Enhanced Small Device Interface (ESDI)
• Small Computer System Interface (SCSI)
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Learning Objectives:Chapter 4 Review
• List four common types of storage devices.
• Name three common uses of floppy disks.
• Name the four data disk areas on floppy and hard disks.
• List three ways tape drives differ from disk drives.
• Identify four types of optical storage devices.
• Name and describe the four main disk drive interface standards.