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Types optical disks
CD-ROMs and DVD-ROMs are circular optical discs that are 5 1/4 inches in diameter and have either a silver or gold reflective layer. They can store between 650 MB to 700 MB of data in a standard 120mm, 74-80 minute format, or 184 MB in an 80mm, 21 minute format. CD-ROMs follow the ISO9660 international standard and come in different shapes and formats, including DVDs, CD-R WORM disks, and CD-RW rewriteable disks.
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Types optical disks
- 3. CD-ROM (COMPACT DISK) & DVD-ROM
- 4. 5 ¼inch (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
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- 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.
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