Not sure what Disk Manager is, but if it says
USB Mass Storage device detected
It appears to be something. If you do a sudo journalctl -f
before you plug it in, does it tell you what device name it is given? If it is sata-to-usb you are using it is probably /dev/sd[a-z] or so, does anyone show up when you plug it in?
Woah, hold on there, that is way too much equations for such a small pocket. Surely they must first be put in the differential form notation.