set diskName to "usbshare1"
tell application "Finder"
	if disk diskName exists then
		eject disk diskName
	else
		tell current application
			set deviceLine to (do shell script "diskutil list | grep \"" & diskName & "\" | awk '{ print $NF }' }'")
			if deviceLine = "" then
				display dialog "The disk \"" & diskName & "\" cannot be found." buttons {"OK"} default button 1 with title "Error" with icon caution
			end if
			set foundDisks to paragraphs of deviceLine
			repeat with i from 1 to number of items in foundDisks
				set this_item to item i of foundDisks
				if this_item contains "disk" then
					do shell script "diskutil mountDisk /dev/" & this_item
				end if
			end repeat
		end tell
	end if
end tell