trouble loading two rosters with the datel transfer kit

[dannyp5]

ive had the CH 2k7 rosters for awhile now but when i loaded the college fb rosters onto my memory card it deleted both my CH 2k7 roster and everything else saved onto my memory card.. i keep trying to save both of the rosters onto my memory card using my transfer kit but it will only save one or the other and every time i load one up it deletes my xbox live gamertag so i have to connect to that again.. anyone know how to save stuff onto the memory card with the transfer kit without deleting everything on the memory card??