How data is written on and read from optical disk. Aaron Ellard. What is an optical disk?.
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A storage medium from which data is read and to which it is written by lasers. Optical disks can store much more data -- up to 700 times more-- than most portable magnetic media, such as floppies. There are several types of optical disks:
Like audio CDs, CD-ROMs come with data already encoded onto them. The data is permanent and can be read any number of times, but CD-ROMs cannot be modified.
Stands for write-once, read -many. With a WORM disk drive, you can write data onto a WORM disk, but only once. After that, the WORM disk behaves just like a CD-ROM
The data is read through lasers
CD-ROM,WORM, erasable, and so on are read with a red laser where the disk driver deciphers the information.
Blu-ray Disc (BD) is an optical disc storage medium designed to surpass the DVD format. The biggest difference is it is read using a blue laser which uses shorter wave lengths to read the data .