On Thursday, 20 August 2020 16:52:27 UTC-4, Arne Vajhøj wrote: > $ SET VOL/STRUCT=5 DKxn > > supposedly should do it, but would it be "better" to backup data, > init disk and restore data? > > Arne If it were me, I would backup the data, create a new disk of ODS5 and "restore" to that new disk using NOINITIALIZE (if an image backup). Dan