DFSMSdss might use virtual concurrent copy for storage devices that support SnapShot or data set FlashCopy® when the CONCURRENT keyword is specified with the DFSMSdss commands. During virtual concurrent copy, data is "flashed" or "snapped" from the source location to the intermediate location, and then copied to the target location using standard I/O. The operation is logically complete after the source data is "flashed" or "snapped" to the intermediate location and physically complete after the data is moved to the target media.