What causes write errors in SMART logs?

• A. Bad sectors, controller issues, or failing NAND on SSDs.
• B. Overheating of the drive.
• C. Firmware corruption in the drive.
• D. Power supply fluctuations.

Answer: (A)

Write errors reported by SMART are signaling problems with the drive’s ability to store data reliably, which most often come from issues with the media itself or the control hardware that manages writes. When a sector goes bad or NAND cells begin to fail, the drive can’t complete a write, so SMART logs errors and may trigger data relocation to spare sectors (reallocated sectors) or report uncorrectable errors. In SSDs, degradation of the NAND and faults in the controller similarly lead to write failures that SMART can flag.

Overheating can cause the drive to throttle performance or protect itself, but it isn’t the direct trigger for SMART write-error records. Firmware corruption might affect how the drive reports itself or behaves, but it’s less about an immediate write failure and more about reliability of reporting. Power supply fluctuations can cause writes to be interrupted, yet SMART’s typical indicators for real write errors point to media or controller problems rather than power events.