Optical disk is a secondary storage. It is when laser light is used to read and write data to the disk. In optical disks the detection of edges of pits is the way bits are represented. They will be a series of tiny pits and lands. A pit is an indentation made on the lower surface of the disk and a land indicates the absence of a pit.
Types of Optical Disks:
There are two main standards of opticals disks: CDs and DVDs. Both a write once, read many. CD stands for companct disk and can hold 700MB. DVD stands for digital optical disks and can hold anywhere from 4GB to 25GB. DVDs are more commonly used for videos while CDS are used for music and bootable images.
Types of Optical Disks:
There are two main standards of opticals disks: CDs and DVDs. Both a write once, read many. CD stands for companct disk and can hold 700MB. DVD stands for digital optical disks and can hold anywhere from 4GB to 25GB. DVDs are more commonly used for videos while CDS are used for music and bootable images.
How is data written on a Compact disk
A compact disk, also known as a CD drive works on the same concepts which a hard drive uses, but in some cases the information is burned onto the disk and is not re-writable. A compact disk is a series of lines on a circular disk which curve with it, when these spin, the lazer under the disk burns the information onto the disk, this information on the disk is stored as binary form. The computer pre-processess this information so that all the lazer needs to do is to move further out at a constant speed and write the data at the specified location.