As your device is attached to a storage node, you may try to stop/restart its 
NW client daemon. The server will try to attach to the device when it can 
connect again.

If this does not help, I am afraid you have to cancel the process and 
unmount/remount the disk media. Then repat the session.

Also i urge you to update and use NW 8 with its new 'synthetic full' feature 
instead of the legacy save set consolidation.

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