All of my other cameras allow me to put in a new SD card then start saving the photos to this card.
The Sony RX100 IV camera starts saving photos to a new SD card when I slot it into the camera but as soon as I want to view the photos on my camera I get the message that there is something wrong with the database (Can't remember the exact message) then if I select "Yes" to fix the problem it erases all the photos I have taken and I think it creates new folders as when I want to play back the photos I have taken I'm told that there are no photos to be played back.
I'm certain that I'm not the only one who has had this happen to them as most people new to this camera must have been caught out. In my case it has happened twice but I lost only two photos of value. It does a good job of deleting the photos as I can't seem to undelete them.
Brian