I built a new PC but used my SSD and HDDs from my old system. This system had the SSD as a boot drive and 2 HDDs in Intel Matrix Raid. I have moved my SSD across fine with bios set as ACHI. I have just added the HDDs that were in matrix raid but I have not set raid in bios and only want to use them as ACHI drives. One drive seems to work fine but the other doesnt. When I go into disk management or any partition software it shows the drive as 2 drives (so 4 in total where there are only 3) which mirror the capacity of the old matrix raid. I can seem to get rid of this so that it shows as just the one hard drive. Help please.