Chapter 4 Storing Information in a Computer Peter Nortons Introduction to Computers.

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Presentation transcript:

Chapter 4 Storing Information in a Computer Peter Nortons Introduction to Computers

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.

Storage Media - the physical components or materials on which data is stored.

Storage Devices - the hardware components that write data to, and read it from, storage media.

Types of Storage: Magnetic Optical

Magnetic: the bits are written and read using magnetism. Optical: the bits are read using light.

Magnetic Storage Devices: Diskettes Hard disks Removable hard disks Magnetic tape

Tape drive Floppy drive Hard drive

Optical Storage Devices: Compact Disk Read-Only Memory (CD-ROM) Write Once, Read Many (WORM) Phase-Change Rewritable disks Magneto-optical disks

CD-ROM

Factors that Affect Drive Performance: Average Access Time Data-transfer Rate

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.

Data-transfer Rate - a measure of how long it takes the device to read or write a given amount of data.

Hard drive RAM Head

Formatting - the process of mapping a diskette by dividing it into Tracks and Sectors.

Tracks - a set of magnetic concentric circles. Sector - a pie-like slice of disk.

Four Areas of a Disk: The boot record The file-allocation table (FAT) The root folder or directory The data area

Drive-Interface Standards: Integrated Drive Electronics (IDE) Enhanced Small Device Interface (ESDI) Small Computer System Interface (SCSI)

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.