Comment 1 for bug 1698630

GParted already supports scanning only the devices you pass to it. This is most easily done from a terminal window.

For example if you wish to scan only /dev/sdf, you can use the following:

sudo gparted /dev/sdf

See the GParted Manual [1] for more information.

[1] http://gparted.org/display-doc.php?name=help-manual#gparted-run-from-cmd-line