Optical storage systems offer (practically) unlimited data storage at a cost that is competitive with tape. Optical disks come in a number of formats, the most popular format being the ubiquitous CD-ROM (compact disc read-only memory), which can hold more than 0.5GB of data. CD-ROMs are a read-only medium, making them ideal for software and data distribution. CD-R (CD recordable), CD-RW (CD rewritable), and WORM (write once read many) disks are optical storage devices often used for long-term data archiving and high-volume data output. CD-R and WORM offer unlimited quantities of tamper-resistant storage for documents and data. For long-term archival storage of data, some computer systems send output directly to optical ...

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