XenData Limited XenData6 User Manual page 55

If the contents catalog gets out of synchronization with the actual tape cartridge, the system will put the
cartridge into a 'XenData Protected' state. In this case, the following message will be displayed in the
event log.
This will occur, for example, if additional data has been written to the cartridge using another system.
To correct this problem,
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rebuild the catalog (5.2)
and then select "Check Filesystem'.