By default, media from Removable Disk Drives and Plug and Play (PnP) Disk Libraries are recycled and moved back to the original scratch pool for reuse when ALL the data associated with ALL the jobs in the media are pruned by the Data Aging operation. If data stored on media meets its retention criteria, or if data is deleted using the Delete Contents option, it is logically deleted (that is, removed from the CommServe database) when the Data Aging job is run. When all the data in a media is pruned, the media is recycled. That is, it is returned to the scratch pool that is currently associated with the storage policy copy containing the media.
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To force the Data Aging job to physically delete the data to reclaim and reuse the media as soon as the space becomes available (instead of waiting for the media to be recycled), see Enabling Space Reclamation From Removable Disk Drives and Plug and Play (PnP) Disk Libraries.
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To reset it back to the default behavior, see Disabling Space Reclamation From Removable Disk Drives and Plug and Play (PnP) Disk Libraries.