Working Technology of Optical Disk Drive

Working Technology of Optical Disk Drive

The Optical Disk Drive is a commonly used Computer Hardware Device , which uses laser light beam or electro-magnetic waves to read or write data’s from or to  the storage media (Optical Disk) . All the Disk Drive’s are not perform the write  operation, but all the disk drives can perform read operation., since there is available of Read only CD/DVD-ROM Drives and Read & Writable CD/DVD-ROM Drives. Some most important Optical storage media are Compact Disk (CD), Digital Versatile Disk (DVD) and Blu-ray Disk, this can be read and writable by the Optical Disk Drive.

 

To Operate the Optical Disk Drive  a little  spindle motor is required, this motor will help to spin the Optical drives for an uninterrupted speed. The rotating speed of the motor would depends on the reading or writing sector of the storage media.

To perform the  read/write operation on the optical disk the drive needs a laser diode,  prism, reflection glass and a lens. The Laser diode create a narrow beam of light. The emitted light travels through the prism and reflects to the lens by the reflection glass kept in serial order next to the prism. The laser beam passes through the lens and reach the optical disk which is kept inside the drive. The optical drive contains millions of tiny bumps called pits and lands (it denote the binary value of  0’s and 1’s). The laser beam which hits the pits are scattered and hits on lands are reflected straight back to the  to lens and the light enters the prism again. Now the beam is reflected in an 90 degree angle and sent to the device diode , it converts the light into electric pulses. The microprocessor designed inside the Drive decode these electric pulses and send them to the computer through the data cable and the controller that delivered by the output devices like monitor and speakers.