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Digital preservation
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===Refreshing=== ''Refreshing'' is the transfer of data between two types of the same storage medium so there are no [[data degradation|bitrot]] changes or alteration of data.<ref name="Cornell-2005"/> For example, transferring [[Population census|census]] data from an old preservation [[CD]] to a new one. This strategy may need to be combined with migration when the [[Computer software|software]] or [[Computer hardware|hardware]] required to read the data is no longer available or is unable to understand the format of the data. Refreshing will likely always be necessary due to the deterioration of physical media.
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