Yes, I´m sure what´s going on. It doesn´t matter what version of grub I´m using and partition type it not involved at all!!!
I suggest that you read CAREFULLY my post before replying. I said it freezes DURING boot and NOT that it doesn´t boot at all!!!
Even when not using RAID at all, the system should report an error reading disk and not stay stuck trying to read a bad sector for a half of an hour !!!!