You mean the lock tab? Yeah, I fiddled with that, but it in the unlocked position to begin with, so I don't think that was the problem.
No, I don't have anything too horribly important on the card--the only problem is I don't know what's on it to begin with! Certainly nothing I can't live without, though. I guess I'll go ahead and format it to see if that works, and if not, get a new card. Once I have a laptop of my own again to even do the formatting, that is, since all of my technology is breaking on me!
Do you think the fact that I don't always hit "safely remove hardware" before popping it out of my computer could be the problem? I thought that this only risked corrupting files, not screwing up the whole disk...
Thanks for the reply, though. ;)