With «closepath», the end of the final segment of the subpath is «joined» with the start of the initial segment of the subpath using the current value of ‘stroke-linejoin’. At the end of the command, the new current point is set to the initial point

As a side note, if you wanted to create a custom icon for your device you could create/download an .icns file and rename it .VolumeIcon.icns and place in your folder/device. You can’t avoid them (but see the dot_clean answer by Saeid Zebardast –they can be