Which SMART attribute trend is commonly used to justify proactive replacement due to wear-out?

Which SMART attribute trend is commonly used to justify proactive replacement due to wear-out?

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

Answer: (D)

The key idea is how SSDs measure remaining life as they wear out from write cycles. The Media Wearout Indicator is a SMART attribute specifically designed to estimate how much life the NAND media has left. As the drive is written to, this indicator changes in a predictable way, usually shown as a decreasing remaining-life percentage. Tracking its trend over time gives a direct, actionable view of wear progression, so you can justify proactive replacement before failures occur. Other metrics are less direct for wear-out: TBW shows total data written over the drive’s life but doesn’t continuously reflect current health; Wear_Leveling_Count indicates how evenly writes are distributed (which affects endurance) rather than how close the drive is to end-of-life; Power_On_Hours is simply how long the drive has been powered, not how much wear the media has sustained.

The key idea is how SSDs measure remaining life as they wear out from write cycles. The Media Wearout Indicator is a SMART attribute specifically designed to estimate how much life the NAND media has left. As the drive is written to, this indicator changes in a predictable way, usually shown as a decreasing remaining-life percentage. Tracking its trend over time gives a direct, actionable view of wear progression, so you can justify proactive replacement before failures occur.

Other metrics are less direct for wear-out: TBW shows total data written over the drive’s life but doesn’t continuously reflect current health; Wear_Leveling_Count indicates how evenly writes are distributed (which affects endurance) rather than how close the drive is to end-of-life; Power_On_Hours is simply how long the drive has been powered, not how much wear the media has sustained.