Really weird! Patches and Performances do not usually disappear once saved (using the disk/utility\1:write function). Anyway, saving to disk is as easy as pressing disk/utility then 3:save and then 4:sound. This is the way you save not only a patch or a performance but a whole user bank. To load it later press disk/utility then 2:load then 4:sound. I usually also save my user banks using Change it! (a wonderful JV/XP freeware editor) or even the Studio Module of Cubase. In order to do this you obviously need a computer and a MIDI connection.