CD-ROM (COMPACT DISK)          &       DVD-ROM
 5 ¼ inch (12 cm) diameter SILVER       OR GOLD LAYER IS USED    THIN LAYER ON THE TOP REFLECTIVE SURFACE    SPACE (65...
Different shapes
TYPES OF DISKS DVD (Digital Video Disc) WORM DISK (CD-R) CD read/write (CD-RW)
A.   A polycarbonate disc layer has thedata encoded by using lands and pits.B.   A reflective layer reflects the laserback...
CAPACITY
Types optical disks
Types optical disks
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Types optical disks

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Types optical disks

  1. 1. CD-ROM (COMPACT DISK) & DVD-ROM
  2. 2.  5 ¼ inch (12 cm) diameter SILVER OR GOLD LAYER IS USED THIN LAYER ON THE TOP REFLECTIVE SURFACE SPACE (650 MB --- 700MB) DISKS ( 120 mm 74/80 min) having also 650 MB --- 700MB 80 mm 21 min DISK HAVING 184 MB MINI DISKS ARE AVAILABLE IN DIFFERENT SHAPES CD-ROM DISKS ARE CALLED (ISO9660) INTERNATIONAL STANDARED ORGANIZATION
  3. 3. Different shapes
  4. 4. TYPES OF DISKS DVD (Digital Video Disc) WORM DISK (CD-R) CD read/write (CD-RW)
  5. 5. A. A polycarbonate disc layer has thedata encoded by using lands and pits.B. A reflective layer reflects the laserback.C. A lacquer layer is used to preventoxidationD. Artwork is screen printed on thetop of the disc.E. A laser beam reads thepolycarbonate disc, is reflectedback, and read by the player.
  6. 6. CAPACITY

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