Technology & Computing
Total Bytes Written (TBW) to Drive Lifespan & MTBF Calculator
Convert a drive's rated TBW endurance and daily write volume into an expected lifespan and compare against MTBF.
Your inputs
Change any value to update the result instantly.
Expected lifespan from write endurance
32.8767 years
MTBF expressed in years
171.2329 years
Annualized failure rate (from MTBF)
0.584%
Daily write volume
50 GB
Whichever limit is reached first — write endurance (TBW) or a random hardware failure (MTBF) — determines the drive's real-world life.
Formula and working
Lifespan (years) = TBW rating ÷ (daily writes × 365); Failure probability over period ≈ hours ÷ MTBF
- 1
Collect the inputs
Drive TBW rating (TB) = 600; Average daily writes (GB) = 50; Manufacturer MTBF (hours) = 1,500,000
- 2
Apply the formula
Lifespan (years) = TBW rating ÷ (daily writes × 365); Failure probability over period ≈ hours ÷ MTBF
- 3
Result
Expected lifespan from write endurance = 32.8767 years
Frequently asked questions
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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