"There is a nice utility to monitor hard drive temperature. Most modern x86 computer hard disk comes with S.M.A.R.T (Self-Monitoring, Analysis, and Reporting Technology). It is a monitoring system for computer hard disks to detect and report on various indicators of reliability, in the hope of anticipating failures.
"hddtemp utility will give you the temperature of your hard drive by reading data from S.M.A.R.T. on drives that support this feature..."