Data not showing although drive full

I copied all my data in extreme 500 through sandisk utility in encrypted format which made it full and then I connected it to my another computer and now it is showing only 2 folder. I was surprised so I re-connected it the original computer and that too is only showing only 2 folders but at the same time not letting me add any further files saying its full. I am not sure what to do at this point. Any suggestions how to recover the data or format the SSD?