With some DVD-R inserted into an optical drive, I see a DVD-R is listed as disc type. 4. Types of CD Drives : 1. The metal layer is then applied to the base, creating the data layer. This layer is created using a molding machine that stamps pits (depressions) and lands (flat surfaces) into a polycarbonate substrate base. It works with either type of cable. OPTICAL DISC TYPES Types of optical disc CD-ROMs/DVD-ROMs (read-only-memory) are commercial grade discs and use a metallic data layer. Optical disk An optical disk is any computer disk that uses optical storage techniques and technology to read and write data. Serial Devices – Magnetic tapes (very fast sequential access) Intended initially for movies, they were quickly adopted in computer systems as well. The lands, or flat surfaces on the CD, are considered to be the "0" in binary code. 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). controllers, it is disk duplexing. Optical Disks Magnetic Disk The Magnetic Disk is Flat, circular platter with metallic coating that is rotated beneath read/write heads. The speed of CD drive specifies the amount of data the CD drive reads from the CD calles as Transfer Speed . and DVD structure, disc life expectancy, and conditions that affect optical discs. It can be sent over coaxial or optical cables. 7. The optical disk is considered an integral part to store the output of the sophisticated invention called the computer. CD-RW drive – Read , write and Rewrite. 2. 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. The next type of optical disc that came on the market was the DVD. •DVD-ROM: • It is a storage device in which optical (light) energy is used. CD-R drive – Reads data from CD and can also write to CD . Other issues relevant to the management or mainte-nance of optical systems are beyond the scope of this document. Optical disc drives use removable media to store and retrieve data, typically 5.25". CD-ROM Drive CD-R Drive 3. You will find many types of optical disk which is useful in various terms and processes. An optical disk is used to hold information for a permanent as well as a temporary basis. CD-RW Drive 6. 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. 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