Change external HDD mount behavior

[Nachteule]

Yes, the magic word is udev

Use this udev rule (I'm using this rule on all my linux boxes, just tested with RPi2, works as expected)

Code:

# /etc/udev/rules.d/50-my-media-automount.rules

# start at sda (to ignore the system hard drive)
KERNEL!="sd[a-z]*", GOTO="my_media_automount_end"
ACTION=="add", PROGRAM!="/sbin/blkid %N", GOTO="my_media_automount_end"

# import some useful filesystem info as variables
IMPORT{program}="/sbin/blkid -o udev -p %N"

# get the label if present, otherwise assign one based on device/partition
ENV{ID_FS_LABEL}!="", ENV{dir_name}="%E{ID_FS_LABEL}"
ENV{ID_FS_LABEL}=="", ENV{dir_name}="usbhd-%k"

# create the dir in /media and symlink it to /mnt
ACTION=="add", RUN+="/bin/mkdir -p '/media/%E{dir_name}'"

# global mount options
ACTION=="add", ENV{mount_options}="relatime"
# filesystem-specific mount options (777/666 dir/file perms for ntfs/vfat)
ACTION=="add", ENV{ID_FS_TYPE}=="vfat|ntfs", ENV{mount_options}="$env{mount_options},gid=100,dmask=000,fmask=111,utf8"
ACTION=="add", ENV{ID_FS_TYPE}=="btrfs", ENV{mount_options}="$env{mount_options},compress=lzo"
ACTION=="add", ENV{ID_FS_TYPE}=="ext4", ENV{mount_options}="$env{mount_options},acl,user_xattr"

# automount ntfs filesystems using ntfs-3g driver
ACTION=="add", ENV{ID_FS_TYPE}=="ntfs", RUN+="/bin/mount -t ntfs-3g -o %E{mount_options} /dev/%k '/media/%E{dir_name}'"
# automount all other filesystems
ACTION=="add", ENV{ID_FS_TYPE}!="ntfs", RUN+="/bin/mount -t auto -o %E{mount_options} /dev/%k '/media/%E{dir_name}'"

# start a script in background if desired
#ACTION=="add", RUN+="/sbin/start-stop-daemon --start --background --exec /usr/local/sbin/plugman -- '%E{dir_name}'"

# clean up after device removal
ACTION=="remove", ENV{dir_name}!="", RUN+="/bin/umount -l '/media/%E{dir_name}'", RUN+="/bin/rmdir '/media/%E{dir_name}'"

# exit
LABEL="my_media_automount_end"

Store this to /etc/udev/rules.d/50-my-media-automount.rules and try again