HddTemp is a panel applet that shows temperature of monitored drive (eg. hard disk). It uses telnet connection to obtain data from hddtemp daemon written by Emmanuel Varagnat. HddTemp applet only queries daemon and visualises returned information. Reading S.M.A.R.T. data from drives and extracting temperature is done by hddtemp daemon.
ROX-Lib2 >= 2.0
hddtemp - http://www.guzu.net/linux/hddtemp.php