- There was no consistent pattern of disk failure associated with high temperature or increased disk activity.
- Some SMART error signals are well-correlated with impending drive failure, including scan errors, reallocation errors, and probational counts; drives that reported a scan error were 39 times more likely to fail within 60 days.
- However, other SMART error signals have only weak correlations with failure, namely seek errors and CRC errors; over 72% of all drives reported at least one seek error.
- A majority of the failed drives (56%) reported none of the aforementioned well-correlated errors, and a large fraction (36%) reported no SMART errors whatsoever.
Lots more data and details in the full paper.