4. 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
6. TYPES OF DISKS
DVD (Digital Video Disc)
WORM DISK (CD-R)
CD read/write (CD-RW)
7. 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
oxidation
D.
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.