Hello everybody, every time a new OS comes out, I make a new installation on another hard disk and I use my system as dual boot but I choose the disk with the OS I want to boot from Bios not with a boot loader. This is what I did with windows 10 and now I have a dual OS system with Windows 7 64 and Windows 10 64 The weird problem I have, is that every time I boot as usual, this means from the hard disk with Windows 7 64, system prompts me to check the Hard disk (chkdsk) with Windows 10 and it always find problems that corrects but what it really does, is corrupting the Windows 10 installation disk so much that I had to reinstall Windows 10. It can boot to Windows 10 but It needs repair with Windows 10 scan disk and after the repair is unusable..... It seems there is a incompatibility with ntfs structure of windows 10 and 7 ???????? I made the same thing 3 times so I am sure it is not a coincidence. I also think that if I boot from the win 10 hard disk, it corrupts the win 7 hard disk but in a way that can be fixed in the next windows 7 boot with scan disk before entering OS. This happened only once and did not tried again because I do not want to reinstall windows 7 if something goes very wrong. Any ideas?