1. Get a better mount and you'll have better error messages.
2. Recently, the kernel learned how to recognize more partitions.
So, if you have a partition that was not recognized before,
or just some junk on the disk in a partition table that
the kernel did not look at earlier, then all following
partitions will have their number increased.
Look at the boot messages. Is your old /dev/sda9 now /dev/sda10?
Andries
(By the way, if there is some junk, you can remove it using fdisk 3.02.)