my 128 memory stick was showing only half the space available after my daughter used it to trasfer video from a vcr to my computer... i decided to reformat the stick --- i reformated it using my imac and the camera would not recognize it... so i went to bestbuy and they tried to reformat the stick and they were unable to , but went to a sales person and we borrowed a memory stick from a sales associate and that worked....seeing that i knew i could get s a new one for 44 dollars 256- memorystick pro (after rebate) from staples i decided to go to there. we again tried to format the memory stic from a memorystick slot in a pc on the floor and reformatted in to FAT- as the new one was.... now the new one will not work, nor the bad one ... any ideas ??? i do not see anything on my camera DSC F-707 sony that will format a memorystick