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I formatted my external USB-drive with GParted to ext2 file system. After that the usb-drive is automounted with root-permission and now I only can write with
sudo to the drive. Of course I can change the permissions manually with
chmod, but the behavior I want is that by inserting the drive it gets automounted with permission 7 independent of which user is logged in, like an usual usb-drive does.
I hope my question is clear enough, if not I'll clarify, just ask me.
Thanks in advance!!