The standard capacity of a DVD is 4.7 GB. and DVD structure, disc life expectancy, and conditions that affect optical discs. Serial Devices – Magnetic tapes (very fast sequential access) •DVD-ROM: • OPTICAL DISC TYPES Types of optical disc CD-ROMs/DVD-ROMs (read-only-memory) are commercial grade discs and use a metallic data layer. CD-RW drive – Read , write and Rewrite. Intended initially for movies, they were quickly adopted in computer systems as well. This layer is created using a molding machine that stamps pits (depressions) and lands (flat surfaces) into a polycarbonate substrate base. It can be sent over coaxial or optical cables. With some DVD-R inserted into an optical drive, I see a DVD-R is listed as disc type. Excluded, for example, are such topics as care and maintenance of the disc drive device and associated hardware and software; digital Optical disk An optical disk is any computer disk that uses optical storage techniques and technology to read and write data. You will find many types of optical disk which is useful in various terms and processes. CD-ROM drive – Reads data from a CD. 2. 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. The speed of CD drive specifies the amount of data the CD drive reads from the CD calles as Transfer Speed . CD-R drive – Reads data from CD and can also write to CD . An optical disk is used to hold information for a permanent as well as a temporary basis. The optical disk is considered an integral part to store the output of the sophisticated invention called the computer. controllers, it is disk duplexing. It works with either type of cable. CD-RW Drive 6. 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). With some CDs-R inserted into an optical drive, I see a CD-R ; With some DVDs-R inserted into an optical drive, I see a DVD-ROM is listed as disc type, instead of DVD-R since DVD-R is inserted onto the drive. The metal layer is then applied to the base, creating the data layer. Other issues relevant to the management or mainte-nance of optical systems are beyond the scope of this document. This is because SPDIF is the encoding or data link protocol and not the wire or cable that runs it over. 7. Optical disc drives use removable media to store and retrieve data, typically 5.25". Optical Disks Magnetic Disk The Magnetic Disk is Flat, circular platter with metallic coating that is rotated beneath read/write heads. SPDIF is a format that interconnects components in home entertainment systems or home theaters with digital high-fidelity systems for sound and music. It is a storage device in which optical (light) energy is used. Two major types of secondary storage devices: 2. 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