Follow these steps to delete all pictures from the memory card in your Sony Cybershot camera
Turn on camera and make sure it is charged.
Press the Playback button (confirm that you want to remove all pictures from the memory card)
Please note - at this point, if you hit the delete button the camera will delete one picture at a time. Before I figured out how to delete all pics this was the point where I got upset, thinking that I had to delete 600 pictures...one at a time.
Using the zoom button, zoom out until you see a grid of pictures on the screen.
Press the delete button. This will causes a menu to pop-up.
Press the up button to select "delete all".
Press the center button to initiate the delete process. (Warning - this will remove all pictures from the memory card. There's no way to undo the deletion.)
Be sure that you want to delete all pictures on the memory card There's no way to undo a deletion of your pictures.