What is the best indicator of drive survival?

• A. Zero pending sectors
• B. Zero pending sectors + zero uncorrectables + stable reallocated count
• C. High TBW
• D. Vendor age

Answer: (B)

A holistic view of SMART health attributes is the best way to gauge drive survival. When there are zero pending sectors, zero uncorrectables, and a stable reallocated sector count, it means the drive isn’t currently encountering unreadable data, hasn’t produced errors that can’t be corrected, and isn’t relocating sectors due to failing ones. Together, these signals indicate the drive is operating within healthy bounds and not showing signs of imminent failure.

Relying on any single metric can be misleading. For example, zero pending sectors alone looks good, but a drive could still have uncorrectable errors or a rising reallocated count that warn of trouble ahead. Endurance metrics like high TBW tell you how much data the drive can write over its lifetime, but they don’t reflect the present health or error conditions of the drive. Age is not a reliable predictor either, since drives can fail at any age.

So the combination of no pending sectors, no uncorrectables, and a stable reallocated count provides the strongest indicator that the drive is surviving well and not on a path to failure.