I have 2 different SSD drives of Windows 10 pro which I can boot to the same PC. I select from the BIOS which boot I wish to use. I use another drive "D" as internal drive, visible in both boots. If I boot in one system I get a security access denied and if I change ownership of drive and subfolders to "Everyone", I can access it on boot 1. If I then boot up in 2nd Win 10, and I again change the security and permissions to "Everyone", It sometimes works on some folders, but does not take it on all files within folders. Then to make things worse, sometimes when I startup on the the 1st boot, I see windows trying to fix errors on the D-drive. After it does that, the ownership changes back to the previous owner (administrator for that boot). And the recycle bin becomes corrupt. If I use an external drive a NAS I don't have any issues with either boot. I would like to be able to share the internal drive, but it's plagued with these issues.