Which SMART attribute is most directly used to monitor wear on SSDs?

• A. TBW
• B. Wear_Leveling_Count
• C. Media_Wearout_Indicator
• D. Power_On_Hours

Answer: (C)

In SSD wear monitoring, the most direct indicator of how much life the flash has left is the Media Wearout Indicator. This SMART attribute is specifically designed to reflect the endurance of the flash memory, giving a direct sense of remaining life or wear level. It’s reported by the drive’s controller as a measure tied to the actual wear from P/E cycles, so you can anticipate failure or the need to replace the drive as the value approaches its end-of-life threshold.

Total Bytes Written, while useful for understanding overall data written over the drive’s life, is a lifetime limit rather than a current wear status. It doesn’t necessarily tell you how much life remains at this moment. Wear Leveling Count indicates how evenly wear is distributed across cells, which helps the controller extend life but doesn’t quantify current wear itself. Power-On Hours simply tracks time powered on; it doesn’t measure wear or remaining life.