Package: hddtemp

"hddtemp" package binaries on CentOS:

/usr/bin/hddtemp /usr/sbin/hddtemp

You may install this package on CentOS with yum install hddtemp

"hddtemp" package binaries on Debian:

/usr/sbin/hddtemp

You may install this package on Debian with apt-get install hddtemp