Great news for me... I did not become sénileet !!
I tryed with an Arduino Uno. The firts tests let me think that I could have to retire early ... but finaly I removed again the 64MB SD card to try an 32GB in FAT32 formatted. Result :
Initializing SD card...Wiring is correct and a card is present.
Card type: SDHC
Could not find FAT16/FAT32 partition.
Make sure you've formatted the card
Besides the first electronic bug, I wonder if :
1) the MEGA coupled to an SD card can be a problem for SD.h
2) a 64MB SD card can be a problem for SD.h
3) a 10 years old Card wich is working fine (I test regularly every hour) can cause problems for SD.h
4) Contrary to what you may read on the official site, the FAT16 could pose a problem SD.h
_ _ _ _ _ /_ _ _ _ _ /_ _ _ _ _ /_ _ _ _ _ Subsequently , why SD.h can't find the FAT? _ _ _ _ _ /_ _ _ _ _ /_ _ _ _ _ /