Data Recovery Glossary > Optical Disk

Optical disk is a high capacity storage medium which uses laser technology to read and write information. Optical disks require optical disk drive to store and retrieve data. Optical disks have low accessing speed but very high data storage capacity. Optical disks are not subject to head crashes or risk of data corruption from magnetic fields.

Optical disks can be broadly categorized into three types:

• Read-only: optical disks that are recorded once at the time of manufacture and cannot be erased. For CD, CD-ROM, DVD-ROM etc.
• WORM (Write Once Read Many): optical disk that can accept data once and read frequently.
• Erasable: optical disks which are rewritable. For example CR-RW, DVD-RAM, DVD-RW etc.

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