Hi Grzyb, this situation has occurred a number of times in the past. Hard Drive capacity exceeds what the MOBO/System supports. Ontrack had a Utility that you could use to Map the Drive Space so it all could be used. It was called Disk Manager...You may have to create more than one partition but that's not all that bad...
Have a look on Ontrack's website to see if they have something to offer..
