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What is a CD-ROM?

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What is a CD-ROM? - PowerPoint PPT Presentation


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What is a CD-ROM?. 5 inch disk Holds up to 700 MB Up to 74 minutes of audio Are coated with aluminum Most popular media used for software distribution Optical storage media. CD-ROM Technology. Data is written by etching pits into the surface of the disk

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what is a cd rom
What is a CD-ROM?
  • 5 inch disk
  • Holds up to 700 MB
  • Up to 74 minutes of audio
  • Are coated with aluminum
  • Most popular media used for software distribution
  • Optical storage media
cd rom technology
CD-ROM Technology
  • Data is written by etching pits into the surface of the disk
  • Areas that are not pitted are called “lands”
  • Light is beamed to the disk
  • The reflection is interpreted by the processors as either data or sound
  • Table 13.1: CLV and CAV
  • TrueX / MultiBeam
performance factors
Performance Factors
  • Drive speeds up to 100x (100 times faster than a standard audio CD)
  • Rated drive speeds are actually maximum speeds
  • Up to 15 MB/sec transfer rate on 100x (usually much slower)
  • Average access time around 80 ms
  • Buffer / cache
  • CPU Utilization
  • DMA
cd rom drive interfaces
CD-ROM Drive Interfaces
  • SCSI
    • Best performance and flexibility+most expensive
  • IDE/ATAPI
    • Most common interface. Good performance at a lower cost
  • Parallel port
    • Convenient and easy to install. Can be expensive
  • USB port
other cd drive features
Other CD Drive Features
  • Drive sealing
  • Self-cleaning lenses
  • Internal vs external
writable cd rom drives
Writable CD-ROM Drives
  • CD-R
    • WORM (Write Once Read Many) drives
    • Excellent for burning “Masters” of data or music
    • Disk is not the same as CD-ROM
  • CD-RW
    • Can be rewritten at least one thousand times
    • Possible use for regular backups?
dvd digital versatile disk
DVD (Digital Versatile Disk)
  • DVD-Video contains only video programs
  • DVD-ROM used as a data storage medium for PCs
  • Backwards compatible (will play CD-ROM and audio CDs)
dvd specifications
DVD Specifications
  • Single sided single layer holds up to 4.7 GB data
  • Single sided dual-layer up to 8.5 GB data
  • Double sided single layer up to 9.4 GB
  • Double sided dual-layer up to 17 GB
other cd technologies
Other CD Technologies
  • Enhanced Music CDs
    • Contains music and data. Sometimes called CD Plus or CD Extra
  • PhotoCD
    • Sold by Kodak as a photo archiving media
  • Divx
    • Short lived technology, already obsolete
caring for optical media drives
Caring for Optical Media / Drives
  • Dirt, scratches, fingerprints
  • Deep scratches
  • Cache size
  • Color combination or cd-r
  • pp 767-769