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2026-04-23 15:59:04 TBW Explained: How to Calculate Industrial M.2 SSD Lifespan
Total Bytes Written (TBW) is the most authoritative metric for estimating the usable life of an industrial M.2 SSD under real-world conditions.
1. What Is TBW?
TBW represents the total amount of data that can be written to a storage device over its lifetime. The formula is: TBW = NAND endurance (cycles) × Capacity × Write Amplification Factor
2. Factors That Influence Actual Lifespan
Write Amplification (WA): Good industrial controllers keep WA below 1.2; poor implementations may exceed 3.0.
Operating Temperature: Flash memory aging accelerates exponentially with temperature.
Workload Type: Sequential writes generate lower WA than random small-block writes.
3. Monitoring Remaining Life
Industrial M.2 SSDs expose SMART attributes. Key indicators:
Wear Leveling Count: Shows the most-erased block's cycle count relative to the average.
Spare Blocks Remaining: When below 10%, replacement should be scheduled.
Temperature History: Logs maximum and minimum temperatures for root-cause analysis.
4. Calculating Expected Service Life
Use the formula: Years of Service = TBW ÷ (Daily Writes × 365 × Write Amplification)
Example: 256GB SSD, 600TB TBW, 50GB daily writes, WA 1.2:
600,000GB ÷ (50GB × 365 × 1.2) ≈ 27.4 years
By monitoring actual write rates and SMART data, system designers can predict replacements before unexpected failures occur.
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