RX50 formatting under RT-11 V5.7 (i.e. FORMAT/SINGLE DUn:) only is supported on certain 3rd-party controllers like the Andromeda ESDC and SCDC. It doesn't work with RQDX1/2/3's. -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology WWW: http://www.trailing-edge.com/ 7328 Bradley Blvd Voice: 301-767-5917 Bethesda, MD, USA 20817 Fax: 301-767-5927