types of Optical disks

USAMA MAHMOOD

F-12 (A)

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 (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

Different shapes

TYPES OF DISKS DVD (Digital Video Disc) WORM DISK (CD-R) CD read/write (CD-RW)

A. A polycarbonate disc layer has the data encoded by using lands and pits.B. A reflective layer reflects the laser back.C. A lacquer layer is used to prevent oxidationD. Artwork is screen printed on the top of the disc.E. A laser beam reads the polycarbonate disc, is reflected back, and read by the player.

CAPACITY