Optical storage devices store data using physical patterns that can be read using light. One of the most common types of optical storage is the DVD, also known as the Digital Versatile Disk or Digital Video Disk, depending on the type of data stored on it. DVDs are plastic disks 120mm in diameter, with a thin metallic layer adhered to one side of the disk, in which the actual data is stored. Microscopic indentations in this layer, known as pits, cause variations in the reflection of light off this metallic surface, resulting in the on and off pattern that represents the digital data stored on the disk. DVDs can store approximately 4.7GB of data on single layer disks, and 8.5GB of data on dual layer disks. Although most commonly used for the storage of high quality video, DVDs are becoming increasingly popular for software distribution and short term data backup.
Oh that's how it works! Now I feel extra smart and cannot wait for someone to ask me how Digital Versatile/Video Disks work.
ReplyDeletelol everyday u learn something right? too bad i already knew all of this. Stephen now i feelin bad. TEACH ME!
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