Mounting a drive is basic linux and not specific to osmc.
Basically you need to do the following from the command line or via ssh:
- create the directory
sudo mkdir /mnt/atvhdd - edit the /etc/fstab file with nano and add the following line to it.
/dev/sda4 /mnt/atvhdd auto rw,auto,user 0 0
A websearch will show you hundreds of tutorials on how to add entries to fstab.
If you need more detailed instructions, you’ll have to wait until another user has time to write up a full tutorial and post it here in the thread.
As for the thread being tagged as “solved”, it’s mainly so other people can look to those threads first for advice. Your question, and any followup answers will help improve the solution for some users. 