Originally Posted by Mikef
many possible solutions - log in as root and hack via Terminal or the simplest: move all the data you want off the SD card and re-initialize it via Disk Utilities then rebuild its contents.
Please go the simple route outlined above. Using sudo or root in the terminal would I fear lead to a pretty frantic post in this forum. The rm command in terminal is a very simple way to delete stubborn files. That said, it is simple because, when logged as root or using sudo, it bypasses all safeguards. If you misspell a file name or aren't in the correct folder, you're very unhappy with the results.