On Debian there is the common problem, that you try to plug an ntfs formatted USB harddrive and then can't write to it as a regular user to it because the directory belongs to root.A little time ago I read that that can be fixed with adding the uid=1000,gid=1000 (or whatever your uid and gid are) options. This does solve the problem but seems a little bit nasty to me, because if you have a multiuser system the drive always belongs to the same user and not to the user who mounted it/is logged in.From my time with Ubuntu I remember that this wasn't a problem and you could mount NTFS drives (with GNOME) and they were writable by the user who mounted them. So it seems that GNOME is able to mount the drive with permissions given to the logged in user.However now I'm using KDE on Debian jessie and I'm wondering if I can configure my computer to mount the drives with the permissions of the user who has the active X-session.
USB drive permissions when automounting
debian;permissions;mount;usb drive
It does seem like you have modified your fstab to mount this device manually .. Or perhaps you have made entries in autofs?  .. Debian/ubuntu has moved along from requiring manually configured mounts for a long time now, even for non-GUI environments.Generally, you would not need to do manual mounts, and all the various desktop environments handle this seamlessly and often in slightly different ways (as long as the device is not setup in fstab).Some would use udev/pmount, with consolekit/policykit helping with auth.  First thing to do is to remove the manual mount settings you have and reboot.  I am sure that alone will fix your automounting challenges.  Why don't you try that first, and then report back if you still have challengesAlso, if you have been tinkering with the permissions of the ntfs-3g or lowntfs-3g binaries, try to revert them back to their default ownerships and permissions.  In short, revert back to default settings and reboot, and you should be fine.  The solution Kiwy is suggesting (and others) would only become necessary when you have further issues after reverting to default settings.. 