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Multimedia and Backups on a PC

Multimedia and Backups on a PC. Multimedia on a PC. Goal To create or reproduce lifelike representations of sight and sound Challenge Data storage is digital Sights and sounds are analog. Multimedia Devices. Sound cards Digital cameras MP3 players Video capture cards. Sound Cards.

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Multimedia and Backups on a PC

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  1. Multimedia and Backups on a PC

  2. Multimedia on a PC • Goal • To create or reproduce lifelike representations of sight and sound • Challenge • Data storage is digital • Sights and sounds are analog

  3. Multimedia Devices • Sound cards • Digital cameras • MP3 players • Video capture cards

  4. Sound Cards • Have ports for external stereo speakers and microphone input • May be Sound-blaster compatible • Sampling accuracy is critical to performance • Stages of computerized sound • Convert from analog to digital (digitize) • Store digital data in compressed data file • Reproduce or synthesize sound (digital to analog)

  5. Sound Card Connections

  6. Digital Cameras • Scan field of image and translate light signals into digital values • Use TWAIN format for transferring images

  7. A Flash RAM Card

  8. MP3 Players • Devices that play MP3 files • MP3 can reduce size of a sound file as much as 1:24 without much loss in quality

  9. Compression Methods Used with MP3 Players • MPEG-1 standard • Image compression for business/home applications • MPEG-2 standard • Video film compression on DVD-ROM • MPEG-3 standard • Audio compression • MPEG-4 standard • Video transmissions over the Internet

  10. Video Capture Card • Captures input from camcorder or directly from TV • Features to look for: • IEEE 1394 (FireWire) port to interface with digital camcorder • Data transfer rates • Capture resolution and color-depth capabilities • Ability to transfer data back to digital camcorder or VCR • Stereo audio jacks • Video-editing software

  11. Optical Storage Technology • Patterns of tiny pits on disc surface represent bits, which are readable by a laser beam • Major optical storage technologies • CD-ROM drives • Use CDFS (Compact Disc File System) or UDF (Universal Disk Format) • DVD drives • Use only UDF

  12. CDs • Read-only; data physically embedded into disc surface • Store data as pits and lands • Use constant linear velocity (CLV) and constant angular velocity (CAV) • Look for multisession feature • Use precautions when handling

  13. Layout of Sectors on a CD

  14. How a CD Drive Can Interface with the Motherboard • EIDE interface (most common) • SCSI interface with SCSI host adapter • Portable drive; plug into external port on PC

  15. Installing a CD Drive

  16. CD-R and CD-RW • CD-R (CD-recordable) • Enables “burning” your own CDs • Cannot edit or overwrite • Bottom of disk is tinted (eg, blue, black); CDs are silver • Inexpensive • Can be read by all CD-ROM drives • CD-RW (CD-rewritable) • Allows overwriting old data with new data • Cannot always be read by older drives

  17. DVD (Digital Video Disc) • Has large storage capacity (8.5 GB one side; 17 GB both sides) • Uses UDF file system • Uses MPEG-2 video compression; requires MPEG-2 controller to decode compressed data • Stores audio in Dolby AC-2 compression • Recently: HD-DVD and read-writable DVDs

  18. DVD Devices

  19. Installing a DVD Drive

  20. Installing a DVD Drive (continued)

  21. Installing a DVD Drive (continued)

  22. Hardware Used for Backups • On standalone PCs or small servers • Tapes • Removable drives • On a PC connected to file server • Back up data to a file server

  23. Floppy Drive Subsystem

  24. How Data Is Physically Stored on a Floppy Disk

  25. How Data Is Physically Stored on a Floppy Disk

  26. How Data Is Logically Stored on a Floppy Disk • Cluster • Smallest logical unit of space allocated to a file • On a 3½-inch high-density floppy disk, one cluster = one sector (512 bytes)

  27. How Data Is Logically Stored on a Floppy Disk

  28. Tape Drives • Advantages • Inexpensive and convenient • Large capacity • Several types and formats • Disadvantage • Sequential access

  29. Tape Drives (continued)

  30. How a Tape Drive Interfaces with a Computer • External • Parallel port with optional pass-through to printer • Internal • IDE ATAPI interface • External or internal • SCSI bus • USB connection, its own proprietary controller card, or floppy drive interface

  31. An ATAPI Tape Drive

  32. Tapes Used by a Tape Drive • Kinds of tapes • Full-sized data cartridges • Minicartridges (most popular) • Match tapes to tape drives; several standards and sizes exist

  33. Minicartridge

  34. Removable Drives • Can be internal or external • Advantages • Increase overall storage capacity • Easy to move large files between computers • Convenient medium for making backups • Easy to secure important files • Considerations when purchasing • Drop height • Half-life of the disk

  35. Types of Removable Drives • Newer • IBM Microdrive • JumpDrive by Lexar Media • Iomega HDD drive by Iomega • Older • Iomega 3½-inch Zip drive • SuperDisk by Imation

  36. IBM Microdrive

  37. JumpDrive

  38. Iomega HDD Drive

  39. Zip Drives

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