Write Once Read Many
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There are two different kinds of such media:
- In some, the hardware prevents multiple writes, examples of such media are the CD-R and DVD-R discs. There is also some kind of computer memory (called PROM) which can only be written once.
- Certain kind of media use a software solution to emulate this behaviour. Examples are certain kinds of backup tapes and harddisks that can also have this property.