[ important : in case you have budgie-trash-applet installed, stop using it from now on, see Trash applet [!] when emptying, follow links? fix pending ]
3⋅ replacing folders in /home/$USER on SSD by links to matching folders on HDD
This is very easy for all the generic folders ( Documents, Pictures, Download… ) there’s a trick though for Desktop.
a⋅ In your personal folder, simply delete the folders - after checking they’re empty, of course. You won’t be able to delete Desktop folder ( since it’s handled by Nemo to display its content on desktop screen, I guess that’s why it can’t be deleted as long as the graphical session is on ) so we will take care of it later.
Using one of the previously mentioned methods, browse to /media/DATA/user/ and create your links.
Put these links in /home/user with the exact same names as the deleted folders. And voilà.
b⋅ Desktop folder. There may be other methods but here is how I deal with it. Login to your usual session. Create a new user, with administrative role. Log out from your session. Login to the newly created user. Open a terminal :
new_user@computer:~$ sudo rmdir /home/usual_user/Desktop
new_user@computer:~$ sudo ln -s /media/DATA/usual_user/Desktop /home/usual_user/Desktop
new_user@computer:~$ sudo chown -h usual_user:usual_user /home/usual_user/Desktop
Desktop might be replaced by the localized name ( in french, Bureau ).
Log out. Login to your usual session. Voilà.
c⋅ Last check for perfection. In your usual session, have an eye on ~/.config/user-dirs.dirs
It should read something like this :
django@ASGARD:~$ cat .config/user-dirs.dirs
# This file is written by xdg-user-dirs-update
# If you want to change or add directories, just edit the line you're
# interested in. All local changes will be retained on the next run.
# Format is XDG_xxx_DIR="$HOME/yyy", where yyy is a shell-escaped
# homedir-relative path, or XDG_xxx_DIR="/yyy", where /yyy is an
# absolute path. No other format is supported.
#
XDG_DESKTOP_DIR="$HOME/Bureau"
XDG_DOWNLOAD_DIR="$HOME/Téléchargements"
XDG_TEMPLATES_DIR="$HOME/Modèles"
XDG_PUBLICSHARE_DIR="$HOME/Public"
XDG_DOCUMENTS_DIR="$HOME/Documents"
XDG_MUSIC_DIR="$HOME/Musique"
XDG_PICTURES_DIR="$HOME/Images"
XDG_VIDEOS_DIR="$HOME/Vidéos"
django@ASGARD:~$
…of course, in your language.
If some path look empty like this …="$HOME/" just add the missing part and save.
This file is used by many programs for them to know where are the « generic » expected user’s folders.
Nemo uses it for some of its bookmarks in left pane and to theme accordingly folders icons.
→ So now everything, hidden or not, under /home/user sits on SSD except for the links, which sources always sit on HDD.
If you delete a link, you don’t delete its source.
Links automatically endorse sources’ permissions and rights. May you have any permission issue, these should be fixed on source files/folders.