System-CoW is a system monitoring SuperKaramba theme.
You must have installed hddtemp and all i2c sensors in kernel to have this script working!
You must launch:
hddtemp -d /dev/hd[abc] // if you have 3 disks!
to have temperature working!
For gentoo add a line to /etc/conf.d/local.start to load the command line at startup!