Windows Server 2016 Administration Fundamentals

Optical disks (4.3.7)

Unlike HDDs that use the electromagnetic field to read and write data from/to disk platters, optical discs utilize laser beams with a specific wavelength to read and write data from/to compact discs (CDs). Always try to differentiate between the optical disk drives (ODDs) and optical discs, such as a CDs or DVDs. The first is the device where the CD or DVD is inserted. CDs contain tracks in the form of a spiral. The starting point for storing data on CDs is the inner track. As is the case with HDDs, optical discs too are measured by capacity in bytes (B). Usually, the capacity of common CDs is between 650 MB and 700 MB, while common DVDs range from 4.7 GB to 8.5 GB. In contrast to HDDs, the speed of optical discs is ...