I have an external NTFS-formatted hard disk for my Win 7 PC. For this disk the group Admins of PC1 has full rights. I connected this hard disk with another Win 7 machine and I was surprised, that on that machine I had access to all the files too. I thought different machine different accounts, but that was wrong.
Then I became curious and changed the permissions only to one specific admin Account on PC1, connected it again to PC2 and voilà the expected result happened: I could not access the files.
Now I'm still wondering why in the first test when permissions where given to the group of admins on PC1, why it was possible to access on PC2?
In the internet I read that when you give permissions to the "standard groups" like admins, users, authenticated users, Than those files can be accessed on every machine, since the SID of these groups is on every Win 7 computer in the world the same.
Is that true?