old cruzer micro 2.0gb

I am trying to transfer pics from my old PC to my new Mac with my “old” San Disk. I have broken the pics down into smaller folders. But now, only half way through, it is saying my sandisk is FULL. I don’t see anything other then the company info on it so I don’t know what is taking up the space. Any solutions??? How can I strip the card free of any old info???

Thanks, Shen