Go use the softwear Paragon Partition Manager™ 10.0 Server will help you,your 8HD 2.5GB is missing because this part change to unallocated.you frist format the 2.5GB partition system file as same as other 5.5GB(NTFS or FAT32 or FAT16 Linux Ext2(3) or Apple HFS) and after merge together if you like.