I've got two 16GB SD-memory cards that suddenly stopped working correctly. Windows reports that it wants to format them in order to make them functional again. However, I'm not able to make the new partition bigger than 512kB. I've also tried a couple of partition applications and they don't seem to be capable of doing a better job.
It seems that this person was in the same situation: http://www.howtogeek.com/forum/topic/4gb-sd-card-cant-reformat-stuck-at-512-kb
Is it still hope for them? Any suggestions?