Hard Disk Sentinel Standard Edition V5.50 is being offered free for a limited time. Fairly popular product on Cheapies to test and monitor hard drives.
via lordra on OzBargain
Couple of clarifications:
1. You must install/register the software within 14 days, and cannot do so afterwards. (not 3 weeks as per the main post)
2. Lifetime use and no upgrades of release v5.50
If you have trouble with the link, try this one - Link
I've been using this utility forever and honestly it's great. I paid for the family version years ago and have zero regret, still recommend it regularly to people.