First timer!. I built from the Max mag. 1 ssd as OS storage, that shows everywhereas Disk C. The seagate HD doesnt show in ' my comp' but shows in DM and as ' unallocated' in ' manage' option. Both drives show 'space used' when ' propeties' opened. yet seagate does not show in ' drives' only SSD as 'C' seagate shows as system reserved or unallocated, checked all cables and wont'format,' windows wont allow it. what have i done wrong, it shows space 'used' but why wont it show as an additional drive in ' drives window'? thanx for your time