What SMART Stats Tell Us About Hard Drives

Backblaze has crunched the numbers to see what percentage of hard drives report SMART errors before they fail. The conclusion was:

Operational drives with one or more of our five SMART stats greater than zero – 4.2%

Failed drives with one or more of our five SMART stats greater than zero – 76.7%

So the moral of the story is that if your hard drive is reporting any SMART errors at all, it would be wise to replace it.