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Quick Facts:
- TBW = Terabytes Written – a durability rating for SSDs
- It’s like the mileage rating on car tires
- Most users never reach the TBW limit
- Your SSD will likely outlast your computer
TBW, or Terabytes Written, tells you how much data an SSD can handle being written over its lifetime. It’s similar to a tire’s mileage rating — a helpful estimate, but not a hard limit. For example, a 256GB NVMe SSD with a TBW of 120 means it can handle 120 terabytes of written data before reaching its rated endurance.
How to Do a Quick TBW Calculation
To estimate how long your SSD will last based on your daily usage, just divide the TBW by how much data you write per day.
For example:
120TB (TBW) ÷ 50GB/day = 2,400 days → about 6.5 years
If you only write 20GB/day, that same drive could last over 16 years. This shows just how unlikely it is for most people to hit the TBW limit in normal usage.
Now, unless you’re downloading huge games like Call of Duty every day or working with 4K video constantly, you probably write far less than 50GB per day. Web browsing, email, documents, and even casual gaming don’t generate much write activity.
So yes, TBW is a useful number — but it’s not a dealbreaker. For typical users, SSDs are usually replaced or upgraded long before that number even matters.