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5.2 Optical Media

5.2 Optical Media . Stephanie Forbis Hardware 6/11/12. CDs pg.1. Created in the early 1980’s by Sony and Phillips to store digital music. Later was adapted to store digital computer data. This was cheap and had large capacity. At least for them it was a large capacity. CDs pg.2.

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5.2 Optical Media

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  1. 5.2 Optical Media Stephanie Forbis Hardware 6/11/12

  2. CDs pg.1 • Created in the early 1980’s by Sony and Phillips to store digital music. • Later was adapted to store digital computer data. • This was cheap and had large capacity. At least for them it was a large capacity.

  3. CDs pg.2 • These CDs had hold up to 74 min. or 80 min. of Audio. • 120mm in diameter. • 1.2mm thick.

  4. CD-ROM pg.1 • They have PITs and LAND. • LAN reflectsand PIT does not. • This method stores binary data. • A laser shine continuously and hits the PITs and LANs then translates to binary to process the data on the disc. • These discs can’t be added to. • FORMATs • ISO 9660 • CD-DA • CD-I • CD-ROM XA • >CD-ROMspeed is expressed in multiples of 150 KBps. • -1x = 150 KBps • -2x = 300 KBps • -4x = 600 KBps • -52x = 7,800KBps

  5. CD-ROM pg.2 • CD-I—A proprietary standard for creating CDs w/ built-in interactivity. • Video CD– A standard for structuring digitized MPEG video files. • CD-R—The standard for recordable optical CDs. CD-RW– The standard for re-writeable optical CDs.

  6. CD-R • Stores Binary data – Is coded with photo reactive dye When the writing laser hits the disc the area darkens. This is another way to hold data instead of PITs and LANs. • A 2x8 CD-R drive • Writes data at 2x speed • Reads data at 8x speed

  7. CD-RW • On this disc you can constantly change the data on the disc. Such as to take off, put on, replace, etc. The bottom surface of this CD is coated with a photo reactive crystal and coding right laser. -This laser causes crystals to form and reflects light. An early problem This disc could only be read by machines that were created with the ability to play this disc. Such as the right laser. • An 8x 4x 32x CD-RW drive • Writes at 8x speed • Rewrites at 4x speed • Reads at 32x speed

  8. CD Drives • Optical Media Standard • Digital Video • Digital Versatile >DVD-ROM has 4.7GBs of storage. • DVD speed is expressed in multiples of 11MBps: • 1x = 11MBps • 2x = 22MBps • 3x = 33MBps

  9. CD Drive Others • DVD-R • DVD-RW • Are alike to CD-R and CD-RW except it can hold more data. • DVD+R • DVD+RW • -These discs are in a rewriteable format based on the CD-RW format. DVD-R and DVD-RW discs are also much more compatible with a wide range of devices

  10. Blu-Ray pg.1 • A much greater storage capacity. • This disc was made for High Definition and expanded content Later made so it could also hold computer data. • The wave length for the red and blue laser are different. • -The blue wavelength is more compact so it can hold more data then the red wavelength. Blu-Ray has a different color laser to read data.

  11. Blu-Ray pg.2 • Blu-Ray storage capacity • Single layer – 25GB • Double layer 50GB • 20 layers 500GB • BD-ROM Read-only • BD-R Recordable • BD-RE Rewriteable SPEED 1x = 4.5MBps 2x = 9MBps Dual layer Discs can hold up to 8.5 GB of data.

  12. Optical drive Facts pg.1 Optical drive (CD or DVD) • Factors • Interface • Included interfaces: • PATA • SATA • SCSI • USB w/ some Firewire drives available. • -Cache • Drives that are used to burn or record discs often include a buffer. • Buffer is used during the recording process. • The cache/buffer includes data that is waiting to be written. • Large cache ensures that there is a constant stream of data during the recording process. • Buffer underrun • When the drive runs out of data that is waiting to be recorded to a disc. • Results in process fail and a wasted disc which is called a coaster.

  13. Optical drive Facts pg.2 Additional Features • Bundled recording software • Slimline drives that are half the size of standard drives. • LightScribe which is a feature that allows the drive to burn an image onto the top surface of a disc. • This creates a disc label. • BE AWARE • Precautions to protect discs: • Some recordable discs use a foil that is placed on top instead of imbedded foil inside the plastic. • This layer is easily damaged by a scratch or by even some types of markers. • To prevent scratching, keep disc in its case when not being used. • When wiping disc, wipe from the center to the edge in straight lines to prevent scratching when being cleaned. • Also direct sunlight and other sources of heat can damage the disc.

  14. THE END I got all of my information from lab Sims.

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