If SMART output shows High UDMA_CRC_Error_Count but zero reallocated sectors, what does this indicate?

• A. Drive failure due to reallocated sectors.
• B. High UDMA_CRC_Error_Count but zero reallocated sectors.
• C. All SMART indicators are normal.
• D. Reallocated sectors count is high.

Answer: (B)

The key idea is interpreting SMART attributes that point to different parts of the system: CRC errors versus sector health. A high UDMA_CRC_Error_Count means there are errors in the data transfer between the host and the drive—the data path is having trouble, typically because of the cable, connectors, or signal integrity on the interface. If the reallocated sectors count is zero, it indicates the drive hasn’t had unreadable sectors that needed to be remapped to spare sectors. Put together, you’re seeing a problem with the data path (communication) rather than with the disk’s surface or its ability to rewrite bad sectors. In practice this points to interface issues like a bad or loose cable, poor connections, or interference, rather than imminent drive failure. To troubleshoot, reseat or replace the data cable, try a different port/controller, and recheck SMART after changes.