Storing information in a computer

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Storing information in a computer

  1. 1. Peter Norton’s® Introduction to Computers Chapter 4 Storing Information in a Computer
  2. 2. 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.
  3. 3. Storage Media - the physical components or materials on which data is stored.
  4. 4. Storage Devices - the hardware components that write data to, and read it from, storage media.
  5. 5. Types of Storage: • Magnetic • Optical
  6. 6. Optical: the bits are read using light. Magnetic: the bits are written and read using magnetism.
  7. 7. Magnetic Storage Devices: • Diskettes • Hard disks • Removable hard disks • Magnetic tape
  8. 8. Tape drive Floppy drive Hard drive
  9. 9. Optical Storage Devices: • Compact Disk Read-Only Memory (CD-ROM) • Write Once, Read Many (WORM) • Phase-Change Rewritable disks • Magneto-optical disks
  10. 10. CD-ROM
  11. 11. Factors that Affect Drive Performance: • Average Access Time • Data-transfer Rate
  12. 12. 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.
  13. 13. Data-transfer Rate - a measure of how long it takes the device to read or write a given amount of data.
  14. 14. Head Hard drive RAM
  15. 15. Formatting - the process of mapping a diskette by dividing it into Tracks and Sectors.
  16. 16. Tracks - a set of magnetic concentric circles. Sector - a pie-like slice of disk.
  17. 17. Four Areas of a Disk: • The boot record • The file-allocation table (FAT) • The root folder or directory • The data area
  18. 18. Drive-Interface Standards: • Integrated Drive Electronics (IDE) • Enhanced Small Device Interface (ESDI) • Small Computer System Interface (SCSI)
  19. 19. 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.

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