optical disc

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optical disc

A direct access storage device that is written and read by light. The most types are CDs, DVDs and Blu-rays. As removable media, optical discs superseded the earlier magnetic disk cartridges. Optical media weigh less, have higher capacities and are not subject to head crashes or corruption from stray magnetic fields. They also have a 30-year life and are less vulnerable to extreme hot or cold. However, as a transportable storage medium, USB-based flash drives and external hard drives are also widely used. Following are the major categories of optical discs based on writability. See CD, DVD and Blu-ray.

Read-Only (Factory Pressed)
Read-only discs are pressed from a master at the time of manufacture and cannot be erased. They include the music CD, CD-ROM, DVD-ROM, DVD-Video and BD-ROM (Blu-ray).

Write-Once (Burnable)
Write-once discs are recorded in the user's environment but cannot be erased. They include the CD-R, DVD-R, DVD+R, BD-R (Blu-ray), WORM discs, as well as magneto-optic (MO) discs in WORM mode.

Rewritable (Phase Change and Magneto Optic)
Rewritable discs can be written and re-written numerous times. Employing phase change technology, consumer-oriented products include CD-RW, DVD-RAM, DVD-RW, DVD+RW and BD-RE (Blu-ray) (see phase change disc). Magneto-optic (MO) disks combine optical with magnetic technologies (see magneto-optic disk). See ISO/IEC 13346, multilevel optical disc, holographic storage, WORM and legality of optical storage.

Writability  Optical Disc Types

    Read only    CD, CD-ROM
                 DVD-ROM, DVD-Video

    Write once   CR-R
                 DVD-R, DVD+R
                 BD-R, WORM

    Rewritable   CD-RW
                 DVD-RW, DVD+RW

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Optical Disc Archive is one of our most modular technologies, said Ellen Heine, Marketing Manager at Sony Electronics.
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Also, since the system uses WORM (write once, read many times) technology, optical discs cannot be altered, and security is assured.
nl) has been delivering mastering systems to the industry since the first generation of Optical Discs.
Machinery manufacturers such as Optical Disc Manufacturing Equipment (ODME) in Eindhoven, the Netherlands; Nobler Technologies in Boston; Toolex Alpha in Stockholm, Sweden; and Marubeni generally assert that today's production systems can make HDCDs.
The DEC-702 Rewritable Optical Disc is manufactured by Pioneer and has a suggested end user price of $250.
The LF-7010 rewritable optical disc drive differs from magneto-optical disc drives in that it uses a newly developed phase-change technology to overwrite information in one pass directly onto an optical disc," said Joe Videtti, national marketing manager, Panasonic Office Automation Group's Computer Systems Division.
MI3MS 1000, the first optical disc system to be marketed by Minolta Document Imaging Systems in its new advanced MI3MS product line (Minolta Integrated Information and Image Management System), was introduced for sale in selected major markets last month.