Thanks for the rapid reply. I appreciate.
It is a 16 GB card.
I did format it with the camera.
My camera works in French and I did "formatage simple".
It erased the files that were on the card, so I know it was formatted by the camera.
My card is in drive F.
I can see the card using Windows and I can copy files on the card, so I know the card is detected and can be used by my computer.
I repeated the trial with STICK several times, with same result, yesterday and today.
Any other ideas?