What causes SMART logs to be empty?

• A. Device doesn't support SMART or RAID hides direct access.
• B. The drive is failing and SMART is recalibrating.
• C. The logs are only available during maintenance windows.
• D. The BIOS has SMART reporting disabled.

Answer: (A)

SMART data can’t be read from the drive, so there’s nothing to populate in the logs. The most common reason is that the device itself doesn’t support SMART, or the RAID controller doesn’t expose SMART data to the host, effectively hiding direct access to the attributes. In that case, the monitoring system has no data to show, so the logs appear empty. Other possibilities are less likely in typical scenarios: a failing drive may still present SMART attributes, maintenance windows don’t govern SMART data collection, and while disabling SMART reporting in the BIOS can prevent access, the standard, straightforward cause for empty logs is lack of SMART support or blocked access by the RAID layer.