Hard Disk Sentinel is an application designed to monitor hard disks activity and track temperature, thus helping you prevent damage and data losses.
You may find the program a bit difficult to use when you first load it, but it's only because it sports a lot of features,  showing valuable information basically anywhere you look.
Drives and partition are listed on the left side, along with health, temperature and free space, so it's easy to pick one and find more information about it.
On the other hand, the rest of the features are organized in tabs, together with detailed explanations to assist you all the time.
The overview tab shows brief information on performance and health, but also power on time and estimated remaining lifetime. Conducting a Surface Test will show even more information and help you fix potential problems, but this feature is only available in the registered version.
The temperature section displays the current temperature for the selected drive, as well as the today average and maximum temperature. Plus, it shows three different graphs with the current, the daily average and the daily maximum temperature.
Disk performance is the section that could prove in handy especially to those who dream about faster transfer rates all day long, showing details such as total data read and write, current, average and maximum transfer rate, but also the estimated maximum transfer rate and the average disk activity.
Hard Disk Sentinel has a comprehensive settings menu to configure hotkeys, disk control, message settings, alerts and even the way the hard disk temperature icon will look in the System Tray.
There are multiple tests available, including Random Seek Test and Surface Test and it's better to close all the other applications before going in there and thus get the best possible results.
All in all, Hard Disk Sentinel is definitely worth the money if you're afraid that something may be wrong with you hard drives. It's just an easy way to make sure you're on the safe side. Or not.

Limitations:
· 30 days trial
· Nag screen

What's New in This Release:
Improvements and new features:
· option to show power state, hard disk serial number, hard disk comment in Status Window and sidebar gadget to identify hard disk drives easier
· show hard disk serial number, hard disk comment in hard disk selector buttons if large buttons used
· Hard Disk Sentinel Tray extension: shows hard disk status, temperature on tray and offers complete status when Hard Disk Sentinel is running in service mode under Vista/Windows 7/Windows 8/Windows 2008 (Pro version only)
· option to use custom hard disk icon sets to reflect hard disk/SSD health status and used capacity in Explorer at Configuration -> Disk control
· shows short self test / extended self test progress on hard disk selector buttons
· option to re-display short self test / extended self test progress window by clicking the flashing "hard disk test" button
· option to Update Disk Information form tray icon context menu
· added Dansk language support
· added Polish language support
· added Macedonian ...