Hi, maybe someone else noticed the same: When you create folders on your data volume the ACLs structure gets ruined and files or folder are non-writeable from windows 7. The default ACLs are definetely killed. My whole 4TB volume is a mess now, I noticed it installing apps, it shows "notepad++.exe" already exists and so on. Even it's impossible to overwrite data without taking over the whole volume, which is pretty timeconsuming and senseless, as windows 10 is messing it up again the next time. I already tried that and reset ACLs to fix it. Also another serious filesystem fault is still there: Booting windows 10 and afterwards windows 7 leads to a chkdsk of all volumes. Windows 10 appears to mark the dirty bit at shutdown or so, or unmounts unsober ... Thanks in advance for your response about those ntfs issues.