06-30-2009 06:16 AM
i need some help urgent.
we have buy many SD Card Ultra II with 2 GB.
We design an board with an micro controller that use the sd card like an flash eeprom.
An File system is not necessary. i write the data direct on the sectors (raw)
the first attemps all works great, i can read and write without any problmens.
but at once it is impossible to write on the card.
i plug the card in the computer and it is impossible to write or format the sd-card.
i write for testing purpose some byte on sector 0, with the program (HxD) under windows, the data was written,
but after an reload (f5) the changes was rejected.
-> the card stops working with the microcontroller and computer
the write cycles was not above 5000.
is the card locked or what happend?
i can read the complete card with HxD, but i cant write under windows
and although the microcontroller cant write anything?
Plz help me!
thx for your reply