What tests can I use to determine the health of a hard disk? I have some HDDs that are 4 years old, but have not been used that much and still seem to be fine. Is there a way to determine the health or integrity of the disk? I can hook these up to my computer via esata. I know there is checkdisk in windows. But I do not remember if checkdisk allows me to pick just certain drives to test. Is there a good 3rd party program, either free or to buy that I can use to check the health of these HDDs? I just purchased and installed an SSD, as my main or C drive, which is great, but my Data drive is still mechanical and is 2 years old. I want to check this one and a couple of other older drives.