What Is A DVD?
A DVD or Digital Versatile Disc is an optical disc. Like the CD, it is used to store digital data, but because of its significantly higher storage capacity, it is used to store very high definition audio and video files as compared to CD’s.
A DVD only works with DVD drives, unlike a CD which can be read on both CD and DVD drives.
Working Mechanisms Of A DVD
How It Is Read
A drive motor will spin the DVD and its speed will depend on which area of the DVD it is reading. The DVD drive will then read the DVD by reflecting a laser off it onto its lens. Reflective and non-reflective patches on the DVD will then be converted to data.
How Does The DVD Write?
To record on a DVD, the correct DVD format (DVD-R, DVD-RW) and DVD recordable drive is needed.
A recording laser will be directed onto light sensitive material on the recordable surface, resulting in alternating blocks of reflective and non-reflective blocks. However, in DVD use much smaller tracks to enable them to record much, much more than CD’s
