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Ultra II writing without any file system?

Hello,

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?

 

Why?

What happend?

 

Plz help me!

 

 

thx for your reply

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Re: Ultra II writing without any file system?

If the card stopped working on a computer reader it means that it has failed to work.