I've been experiencing problems with my HDD, so I ran a self-test on it. As you can see, the test failed, but all individual attributes are OK. How do I know what the problem is with the drive?
The most important factor is any (unspecified) problems, rather than the SMART stats. It's possible for a disk to fail, even though SMART says its almost perfect.
This is the time to make sure you have a backup of important data. You might consider the purchase of a SATA SSD and copy all your data to it.