In my present configuration, my /home lives on a regular spinning hard drive, with the exception of /home/mac/runtime which is a partition from a SSD.

My problem is that such partition shows up as a "removable device" even if the mount options are such that is not possible for the user to unmount it at all (besides, it is not a removable device, given that it is a partition of an internal hard drive!).

Indeed my goal would be for the partition layout to be totally transparent (my /boot is on another disk too, but the user wouldn't know, and the /boot doesn't appear as a removable drive).

The portion of my /etc/fstab of interest looks like this:

# /home was on /dev/sdb1 during installation

UUID=<my-uuid-here>  /home              ext4  noatime,nodiratime   0  2  

# /home/mac/runtime was on /dev/sda3 during installation

UUID=<my-uuid-here>  /home/mac/runtime  ext4  noatime,nodiratime   0  2 

Thank you in advance for your help!