@Amigo1
Is this 3rd partition the one giving trouble? and is this partition also occupying the last group of cylinders? Try decreasing the amount by one? Sometimes quirky situations require illogical procedures
Perhaps when you read in the manufacturers settings you could calculate new ones? I used to do it all the time but I couldn't tell you how to do it now LOL
Is the block size 512? probably default but who knows.
Perhaps partition it all again but don't set the two other partitions yet (as in don't save it so it survives reboot) but only this problem partition...
There's heaps of things to do that are whacked LOL but I've forgotten alot of stuff since moving to the SAM units...
Good Luck
Perhaps Thomas utility solved it all anyway