Optical Data Storage Techniques

OPTICAL DATA STORAGE TECHNIQUES

Optical data storage is the storage of data in an optical medium using Laser light. Here data is recorded and read by focussing the laser on a spinning optical disk.

There are various techniques by which the data can be stored using optical devices, such as

1. CD-ROM [Read only memory]

In this compact disk [CD] we can write and read the data, but could not re-write the data.

2. CD-RW

In this CD, we can write, read and re-write the data as and when required.

3. DVD

In DVD [Digital Versatile Disk], based on storage capacity, we have many types, viz.

4. Blu-ray disks

In single layer Blu-ray disk 25 GB can be stored and in double layer blue ray disk 50 GB can be stored.

5. Magneto Optical (MO) disk

Magneto optical disk is like magnetic computer disks, in which we can write, read, erase and re-write the data repeatedly.

6. Holography

Holography is also a type of latest technique in which recording and reading of 3-dimensional pictures/data shall be done, which was well known as holograms.

Let us discuss in detail about some of these techniques.