OK so i installed Windows 10 64bit on MBR partition ISO, SSD(with Windows) and an old 320 GB HDD are runing fine, but one of my HDD was not showing not even in disk management and diskpart disk list, so i connected it with external usb case it finally showed up on diskpart disk list and in disk management but as "GPT Protective Partition" i cannot do anything, there is this method to convert it to mbr in diskpart but it formats it too, i want to convert it to MBR without losing data. PLease HELP.