Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Storing Information in a Computer

430 views

Published on

Published in: Business, Technology
  • Be the first to comment

Storing Information in a Computer

  1. 1. Chapter 4 Storing Information in a Computer Peter Norton’s® Introduction to Computers
  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. Magnetic: the bits are written and read using magnetism. Optical: the bits are read using light.
  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. Hard drive RAM Head
  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.

×