Optical Disks Magnetic Disk The Magnetic Disk is Flat, circular platter with metallic coating that is rotated beneath read/write heads. The metal layer is then applied to the base, creating the data layer. and DVD structure, disc life expectancy, and conditions that affect optical discs. An optical disk is used to hold information for a permanent as well as a temporary basis. Excluded, for example, are such topics as care and maintenance of the disc drive device and associated hardware and software; digital Serial Devices – Magnetic tapes (very fast sequential access) Types of optical discs include •CD-ROM: Data CDs can typically hold 700 MB, can read and write at up to 52x (7.8 MB/s), and can rewrite at up to 32x (4.8 MB/s). It is a computer storage disk that stores data digitally and uses laser beams to read and write data. Other issues relevant to the management or mainte-nance of optical systems are beyond the scope of this document. CD-RW Drive 6. It works with either type of cable. Optical disk An optical disk is any computer disk that uses optical storage techniques and technology to read and write data. OPTICAL DISC TYPES Types of optical disc CD-ROMs/DVD-ROMs (read-only-memory) are commercial grade discs and use a metallic data layer. It is a Random access device; read/write head can be moved to any location on the platter Floppy Disk These are small removable disks that are plastic coated with magnetic recording material. CD-ROM Drive CD-R Drive 3. This layer is created using a molding machine that stamps pits (depressions) and lands (flat surfaces) into a polycarbonate substrate base. Types of CD Drives : 1. Two major types of secondary storage devices: 2. The lands, or flat surfaces on the CD, are considered to be the "0" in binary code. •DVD-ROM: • It is a storage device in which optical (light) energy is used. CD-ROM drive – Reads data from a CD. You will find many types of optical disk which is useful in various terms and processes. SPDIF is a format that interconnects components in home entertainment systems or home theaters with digital high-fidelity systems for sound and music. CD-R drive – Reads data from CD and can also write to CD . With some DVD-R inserted into an optical drive, I see a DVD-R is listed as disc type. This is because SPDIF is the encoding or data link protocol and not the wire or cable that runs it over. The standard capacity of a DVD is 4.7 GB. 2. controllers, it is disk duplexing. The next type of optical disc that came on the market was the DVD. Intended initially for movies, they were quickly adopted in computer systems as well. The optical disk is considered an integral part to store the output of the sophisticated invention called the computer. 4. CD-RW drive – Read , write and Rewrite. Optical disc drives use removable media to store and retrieve data, typically 5.25". 7. 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