elmuedo,

to delete all images on the memory card:
-MENU → (Recording) → [Media] → [Format].
-Select [Enter]. (Quick formatting)
-When you press the (Delete) button, a message to perform a full format is displayed. You can start the full formatting by selecting [Enter].

If you are using a memory card with this camera for the first time, it is advisable to format the card with the camera to ensure stable function of the memory card. Note that formatting permanently deletes all data on the memory card and cannot be restored. Save valuable data on a computer, etc.

Sony Europe

Hi, if you want to delete everything on the memory card then it is better to go to the menu under Media=>Format=>Delete everything.

you can use the format option