The CD/DVD RW
Tuesday, January 1st, 2008The CD/DVD RW
The CD/DVD RW is the piece of hardware that read/writes optical storage media. CD-s are made of plastic (injection-molded piece of clear polycarbonate plastic) and are about 1.2mm thick. They work by writing information in some “bumps” aligned in tracks that are binary ones and zeros. The information is read or written in your CD/DVDRW unit using a laser beam. The unit has a disk drive motor that spins the disk inserted, and a laser emitter with a lens that focuses the beam on the disk. The laser beam passes the bumps and reflects in different ways from. An opto-electronic sensor detects the changes in the way the laser beams reflects back and interprets data. The whole read/write with the emitter and lens move along the spinning disks collecting informations.
