I've seen this before. In most cases the card needs to just be reformatted. Default formats are sometimes incorrect, and Windows allows the mistaken format, while Linux is a little more strict.
** Changed in: linux-source-2.6.20 (Ubuntu) Status: Unconfirmed => Rejected -- USB Card Reader not working right with some cards https://launchpad.net/bugs/89138 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs