I have a dual boot system setup on my system on drive runs win 10 pro (formerly win 7 ultimate) and the other runs 8.1 pro. but when I boot to 8.1, windows notifies me after a while that my data drive that I use with windows 10 and is also accessible from win 8.1, is corrupted. I let win 8.1 restart and run chkdisk (which takes forever) and then I went to boot windows 10. windows 10 says there is an issue with the same drive, and proceeds to fix it. the fix process says that there is a lot files with bad security descriptors. after another long period of running chkdsk, from windows 10, I try to access the drive, which windows tells me is unintialized. I used Testdisk to recover the partition, but all security permissions on the drive are gone, blocking access. I used permission time machine 1.2 to reset the drive security so I can regain access, but when I do I find that out of 1tb of data less than 4Gb of data remain. there is also a large found.000 directory containing about 20gb of data. problem has happened twice. during the first time, my win10 drive was accessible to win 8.1 as well as my data drive, I lost all data on the win10 and the data drive.

after the first time, I reformatted and done a clean install of win8.1 pro and did a factory restore on the win7 drive and then upgraded that drive to win10. I disallowed access to my win10 drive from win8 before upgrading win7 to win10, but I left my data drive vulnerable.

there is something in either win8 or win 10's filesystems that make the filesystems incompatible. is anyone seeing this issue too?

• Edited by Cybot Saturday, August 22, 2015 4:17 AM

Hi,

Did you mean the Windows 10 drive file corrupt instead of Windows 8.1 pro, right?

Windows 8.1 and Windows 10 file system should be the same, NTFS.

What's file system of your these two drives?

You could check as this path(boot into anyone operating system):

Right click the start button, select Disk Management to check it.

And generally, when you boot into one system, another system drive would be as a data drive appear in the Explorer and could be accessed without any problem.

Please make sure those two drive are both formatted as NTFS, and install the Windows 7, Windows 8.1 on those two different drives. And then upgrade Windows 7 to Windows 10 again to check the result.