SD card write destroys card

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aslm

Joined: 03 May 2002
Posts: 125
Helped: 5

09 Dec 2004 0:31 SD card write destroys card

Hi Have a small question about SD cards, if anyone has worked with those...

I have written code to read write the card and a small FAT system is implemented.

I have no problem reading the cards and I can in almost all cases write to them as well. But in some rare ocations when I remove the card during a write the whole SD dies (users might do this so it must work).

The card reports as unformated when I try to read it on a windows PC and the most strange thing is that I cannot format it either. I have eaven tried to write to it byte by byte in my aplicaiton without succeding.

I would understand if the FAT or something gets messed up, but now I cant eaven accec the card. Any ideas about what I do wrong? The same has hapend to 3 SD cards in total until now.

All the communication is done in SPI mode so there is no "secure" part involved.

re Me