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WORM is an acronym for Write Once, Read Many. A WORM drive is an optical storage media device that uses removable discs. WORM drives can store large amounts of data (up to 15 GB per removable disc). This differentiates them from CD-ROM drives, with a maximum of approximately 700 MB. WORM drives are expensive and the removable media is relatively economical and fast, but they are becoming obsolete.

Businesses store data onto WORM drives using a laser that creates ablations on the internal media. This data is placed into what is considered long-term storage. If you wish to delete data on a WORM disc, all that the computer does is map the sections with the data as bad or not available. The data is actually still physically there, just not accessable to users. A data recovery service can recover the data should the need arise.

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