I wanted to put Wikipedia on my laptop, so I got a 16 GB SDHC card to hold it, but it was formatted as FAT32, and it can't hold the 12 GB image, so I tried to reformat it to NTFS, and it's now dead as a doornail. The OS can't see it, or can't access it, anyway. So I can't format it back to FAT32, either.
I tried to rescue it with Ubuntu, but it can't see it either.
How should I do?