I assume that you mean to find a way to identify empty disks in a storage group. First of all, there really is no such thing. If a disk is SMS managed it will have at least a VTOC, most likely a VTOC index, and a VVDS unless it is a newly initialized disk with no pre-defined VVDS. I am not aware of any commands or products that can tell you if a disk only contains those datasets. I guess one could use MXIREXX (since you mention MXI) to make a list of a SG, then process the list to find disks where free space is close to total capacity, then do a list VTOC of those disks to check for 'real' datasets. For list VTOC I would use the VTOC command from CBTTAPE.ORG file 112.