optical disc

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optical disc

A direct access storage device that is written and read by light. The most common types are CD, DVD and Blu-ray. As removable media, optical discs superseded the earlier magnetic disk cartridges because they weigh less, have higher capacities and are not subject to head crashes or corruption from stray magnetic fields. Optical media also have a 30-year life and are less vulnerable to extreme hot or cold.

However, as a transportable storage medium, they have mostly been superseded by USB-based flash drives and external hard drives. Following are the major categories of optical discs in order of writability.

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). See CD, DVD and Blu-ray.

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

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) as well as ultra density optical (UDO). See phase change disc.

Magneto-optic (MO) disks combine optical and 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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At this time there are only two multifunction optical disc drive manufacturers-Panasonic Office Automation and Pioneer Electronic Corp.
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The company said that the decision does not indicate any intention for EDC to exit the optical disc business and stressed that the Hannover facility is a substantially profitable facility.
The availability of driveCubes for HD VMD on the DaTABANK system is a catalyst for the optical disc industry and promotes the growth of the HD VMD format alongside Blu-ray and HD DVD.
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In addition, a significant new market developed for data-storage devices that took advantage of the inherent low cost per byte of optical discs. With its ability to store up to 680 MB, the CD-ROM is rapidly becoming the favored mode of distribution for large quantities of data.
Music CDs are the most commonly known optical disc. Rarely used in training, audio CDs were the first optical discs to meet the public's eye.

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