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I had windows 7 on my old hard drive then I bought a new one so I decided to install a win 8 on it . now I have them on separate disk and if I want to use one I should select that Hdd on setup boot menu . but there is a problem when I use windows 8 and decided to use win-7 It always perform checkdisk on startup , if I cancel that the drives that i used in win8 will no longer be functional. what should I do? is it something wrong? p.s : the drive letter of my win 8 is C in windows 8 itself but it's F in win 7

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Your question is not clear. The reason the chkdisk happens is because Windows 8 is modifying a Windows 7 disk. – Ramhound Apr 2 '13 at 16:59
is there any way that I could disable it ? – PedramH Apr 2 '13 at 18:32
There is indeed a registry key value you can set so chdisk is not automatically ran. That particular question has been asked more then once since I myself found the answer on this website. – Ramhound Apr 2 '13 at 18:43

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