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Comprehensive Guide to Computer Storage Technologies and Peripheral Devices

This guide explores various computer storage technologies, including floppy disks, CDs, and DVDs, comparing their mechanical and optical characteristics. It covers data storage processes, the role of expansion slots/cards, and the comparison of display devices and printers. Detailed insights into storage media and devices, such as hard disks and RAID systems, will help you understand versatile storage options. Additionally, it delves into keyboard peripherals and the importance of the Windows Registry for hardware and software integration, providing a complete overview of computer hardware essentials.

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Comprehensive Guide to Computer Storage Technologies and Peripheral Devices

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Presentation Transcript

  1. Computer Hardware Unit B

  2. Objectives • Introduce Storage Technology • Compare Storage Technologies • Compare Storage Media and Devices • Explore Floppy Disk Technology • Explore CD/DVD Technology

  3. Objectives • Understand Expansion Slots, Cards, Ports, and Cables • Compare Display Devices • Compare Printers • Examine Keyboards • Explore Peripheral Devices

  4. Storage Technology • Storage Medium: disk, CD, DVD • Storage Device: mechanical; disk drives, CD drives Storage = Medium + Device

  5. Storage Process • Data copied from storage device to RAM • Processed in RAM • Volatile (temporary) high speed storage • Data copied back to storage medium (permanent) • Storing data is writing/saving file • Retrieving data is reading/loading/opening file

  6. Magnetic Optical Storage Comparison vs.

  7. Magnetic Storage • Magnetizes microscopic particles on medium surface • Permanent, but modifiable • Hard disk, floppy disk, zip disk and tape • Read-write head • Not very durable

  8. Optical Storage • Stores data as microscopic light and dark spots on disk surface • Pits and lands • Uses laser lights • More durable

  9. Comparing Storage Devices • Versatility • Durability • Speed • Access time • Milliseconds • Random vs. sequential access • Data transfer rate • Capacity • KB, MB, GB, TB • Disk density

  10. Comparing Storage Devices

  11. Adding Storage Devices • Upgrading • System Unit contains drive bays

  12. Zip disks (Iomega): 100 and 250 MB SuperDisks (Imation): 120 MB 3½” disk: 1.44 MB Floppy Disks are Portable

  13. Hard Disks (Fixed Disks) • One or more platters with read/write heads • Capacity averages 40 GB • Very fast access times (rpm) • Platters divided into tracks, sectors, cylinder • Controller (circuit board) • Ultra AT • EIDE • SCSI • Head Crash

  14. RAID • Redundant Array of Independent Disks • Combines two or more drives • Faster access and protects data from loss • Mainframes and servers

  15. CD Technology • CD-ROM: Compact Disk Read-Only Memory • Manufactured; cannot change; 680 MB • CD-R: Compact Disk Recordable • You record; cannot be erased or modified • CD-RW: Compact Disk Rewritable • You record; can erase and modify • Archiving Data

  16. DVD Technology • Digital Video Disk • Originally alternative to VCR • 4.7 GB • Manufactured • Can play CD-ROM and most CD-Rs and CD-RWs

  17. Busses • Data Bus: circuits on which data travels within the computer • Between RAM and CPU • Between RAM and storage devices • Expansion Bus • Part of data bus between RAM and the peripherals

  18. Expansion Slots and Cards • Cards also called expansion boards, controller cards, adapters • Desktops have 4 to 8 slots • Standard cards • Graphics or video card • Modem card • Sound card • Network card

  19. Expansion Slot Types • ISA: Industry Standard Architecture • Older; modems and slow devices • PCI: Peripheral Component Interconnect • Fast; graphics, sound, video • AGP: Accelerated Graphics Port • Fast; graphics

  20. PCMCIA (PC Card) • Personal Computer Memory Card International Association • Found on notebook computers • Type I, II, III

  21. Expansion Ports • Jacks or connectors • Mouse, keyboard, serial, USB • Cables

  22. Display Devices • Graphics card • Video memory • AGP expansion card • Accelerator technology • CRT: Cathode Ray Tube • Inexpensive and dependable • LCD: Liquid Crystal Display • Expensive; found on notebooks • Limited viewing angles • Active Matrix or TFT (thin film transistor)

  23. Display Device Image Quality • Screen size (13” to 21”) • Dot pitch • Distance between like-colored pixels • .26 or .23 typical (smaller is better) • Resolution • Horizontal and vertical pixels on screen • 640 x 480, 800 x 600 and 1024 x 768 • Color or Bit Depth • Number of colors that can be displayed • 24-bit (true color) = millions of colors

  24. Printer Comparison Criteria Resolution (dpi) Quality vs. Price Materials Cost Speed (ppm or cps)

  25. Printer Types • Ink Jet printer • Solid Ink printer • Thermal Transfer printer • Dye Sublimation printer • Laser printer • Dot Matrix printer

  26. Ink Jet Printer • Nozzle-like print head sprays ink • Low cost • Can smudge • Color; black and white

  27. Solid Ink Printer • Crayon-like ink is melted and sprayed • Vibrant colors on most types of paper

  28. Thermal Transfer Printer • Uses wax that is melted • Needs special paper/transparencies • Expensive

  29. Dye Sublimation Printer • Like wax transfer, but uses heated dye • Need special paper • Excellent color quality • Expensive

  30. Laser Printer • Same technology as photocopier • Fax • High quality • Fast

  31. Keyboards

  32. Peripherals • Device driver software on CD • Plug and Play (PnP)

  33. TechTalk: Windows Registry • Registry is the glue that binds together the PC hardware, peripherals, application and system software • Operating system needs to know (and registry holds) • where peripherals are located • what has been installed • how they are configured • how you want to use them

  34. Techtalk: continued • Examples: resolution, shortcuts, system events, network settings, uninstall routines • System.dat and User.dat • Registry updated when you install or remove hardware or software

  35. Issue Why Recycle Computers?

  36. Computer Hardware End

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