How do i explain to Xubuntu that some drive is actually internal?

I have two drives on my machine, both are internal. However, the second drive keeps showing up as external:

1. There is no trash facility on that drive. Files are deleted right away.
2. In all the file managers there is the 'Dismount' option, which then fails if i try to do that (since the drive's partition is mounted via fstab).

How can i explain to Xubuntu that the drive is actually internal, so that those things will get fixed?

Here's the line in /etc/fstab:

/dev/mapper/largevg-work    /home/volodya/work  ext4    errors=remount-ro   0   2

and also

$ udisksctl dump |grep '^[^ ]\|Remova'[...]/org/freedesktop/UDisks2/drives/MATSHITA_DVD_RAM_UJ8E1_SZD5L67522:    MediaRemovable:             true    Removable:                  true/org/freedesktop/UDisks2/drives/Multiple_Card__Reader_058F63666435:    MediaRemovable:             true    Removable:                  true/org/freedesktop/UDisks2/drives/ST2000LM015_2E8174_ZDZ09HM4:    MediaRemovable:             false    Removable:                  false/org/freedesktop/UDisks2/drives/WDC_WDS250G1B0A_00H9H0_172703800034:    MediaRemovable:             false    Removable:                  false

My 'large' drive is showing false, as you can see. But still...