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CD-MO Orange Book Part 1

This standard defines an optional pre-mastered area conforming to the Red,
Yellow or Green book standards for read-only, and a recordable area. It utilizes a
read/write head similar to that found in magnetooptical drives. We can combine
the pre-master multimedia objects as the base and develop their own versions.

CD-R Orange Book Part 2

This standard allows writing data once to a writeable disk. Here, the CD contains
a polycarbonate substrate with pits and lands.

The polycarbonate layer is covered with an organic dye recording layer. As in
CD-ROM construction, the track starts from the canter and spirals outwards. CD-
R uses a high-powered laser beam. The laser beam alters the state of the organic

dye such that when the data is read, the altered state of dye disperses light instead
of reflecting it. The reflected beam is measured for reading the state of each bit
on the disk.

Mini-Disk

Mini-Disk for Data is known as MD-Data. It was developed by Sony Corporation.
It is the data version of the new rewritable storage format. It can be used in three

formats to support all users.
A premastered optical disk.
A recordable magneto-optical disk.

A hybrid of mastered and recorded. Its size is 2.5 inch.
It provides large capacity. It is low cost. It is used in multimedia applications.

WORM Optical Drives

 It records data using a high-power laser to create a permanent burnt-in
record of data. The laser beam makes permanent impressions on the surface
of the disk.
 It creates pits. Information is written once.
 It cannot be written over and cannot be erased. i.e., Here data cannot be
edited.