Completely un-usable while the overwrite is being done, best bet is to set it to do them automatically every night/week/month (Whichever is good enough for your location)
CWIS > Properties > Security > Image Overwrite Security
Completely un-usable while the overwrite is being done, best bet is to set it to do them automatically every night/week/month (Whichever is good enough for your location)
CWIS > Properties > Security > Image Overwrite Security