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 next type of optical disc that came on the market was the DVD. CD-RW Drive 6. 2. It is a computer storage disk that stores data digitally and uses laser beams to read and write data. This is because SPDIF is the encoding or data link protocol and not the wire or cable that runs it over. Optical disk An optical disk is any computer disk that uses optical storage techniques and technology to read and write data. It can be sent over coaxial or optical cables. 4. Optical disc drives use removable media to store and retrieve data, typically 5.25". CD-ROM Drive CD-R Drive 3. The standard capacity of a DVD is 4.7 GB. 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. Direct Access Storage Devices (DASDs) – Magnetic Discs Hard disks (high capacity, low cost, fast) Floppy disks (low capacity, lower cost, slow) – Optical Disks CD-ROM = (Compact disc, read-only memory 3. It is a storage device in which optical (light) energy is used. 7. The lands, or flat surfaces on the CD, are considered to be the "0" in binary code. It works with either type of cable. SPDIF is a format that interconnects components in home entertainment systems or home theaters with digital high-fidelity systems for sound and music. •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. You will find many types of optical disk which is useful in various terms and processes. The speed of CD drive specifies the amount of data the CD drive reads from the CD calles as Transfer Speed . Serial Devices – Magnetic tapes (very fast sequential access) With some DVD-R inserted into an optical drive, I see a DVD-R is listed as disc type. The metal layer is then applied to the base, creating the data layer. CD-ROM drive – Reads data from a CD. 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. Two major types of secondary storage devices: 2. Other issues relevant to the management or mainte-nance of optical systems are beyond the scope of this document. Types of CD Drives : 1. This layer is created using a molding machine that stamps pits (depressions) and lands (flat surfaces) into a polycarbonate substrate base. CD-R drive – Reads data from CD and can also write to CD . 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