It is very important to always keep the system healthy so that it can work more efficiently. Healthy PCs not only work properly but also last long. There are different things which you can do to keep your PC healthy. For example, keep dust away, keep the system away from direct sun light, monthly cleaning, keeping PC in shade, temperature should be normal like 24C, shutdown PC every few hours to give it rest, open pours in PC frame for fresh air circulation, cleaning all the internal fans like CPU and GPU fans. And finally using some software to monitor hard disk temperature.
Hard disk monitoring is very important because, normally, your all data is saved on it. Its failure can be disaster. You may washed your hand from your precious data. There are freeware available like HDDScan, Acronis Drive Monitor as well as shareware like PCSuite Inspector. PCSuite Inspector v1 is a tool to monitor hard disk temperature. It is different based on its features.