How Many Years Will My SSD Last?
By Devin Chua · Data checked by Owen Nakamura · Updated Reaching the TBW figure does not mean the drive stops. It means the endurance warranty has expired: most consumer SSDs are warranted for whichever of TBW or the year term arrives first, and in ordinary desktop use the years run out long before the terabytes do. Treat this as the warranty horizon, not a death date.
An SSD's endurance warranty is expressed as terabytes written. Divide that by how much you write per year and you get the years until the rating is used up. At 50 GB a day, a 600 TBW drive lasts about 32.9 years on paper, which is why the year term almost always expires first.
The formula
years = TBW / (GB per day / 1000 x 365)
DWPD = TBW / (capacity TB x 365 x warranty years)Worked examples
| Case | Inputs | Working | Result |
|---|---|---|---|
| Desktop use | 600 TBW, 50 GB/day | 600 / (0.05 x 365) | 32.9 years |
| Heavy use | 600 TBW, 200 GB/day | 600 / (0.2 x 365) | 8.2 years |
| A busy database | 1200 TBW, 2000 GB/day | 1200 / (2 x 365) | 1.6 years |
What TBW means and what it does not
Terabytes written is an endurance rating: the total volume of data the manufacturer warrants the drive to absorb before the warranty's endurance condition is exhausted. It is not a cliff. Drives in endurance testing routinely write several times their rating before failing, and most consumer SSDs enter a read-only state rather than losing data when the flash finally wears out.
The practical consequence of running the numbers is usually reassuring. At 50 GB a day, a typical desktop write rate, a 600 TBW drive takes nearly 33 years to reach its rating. The five-year warranty term expires long before the terabytes do, which means for most people the endurance figure is not the binding constraint on the purchase at all.
Finding your real write rate
Guessing your daily writes usually overestimates them. The drive knows: SMART attributes record total host writes, and dividing by power-on days gives your actual average. On Windows, CrystalDiskInfo reports it; on Linux, smartctl does. Most desktop users land between 10 and 50 GB a day. Gaming installs, video editing scratch space and virtual machine images push it higher; browsing and office work push it lower.
Write amplification, which this calculator does not model
The flash writes more than the host asks for. Garbage collection, wear levelling and the translation layer all add internal writes, and the ratio worsens on a drive kept nearly full because the controller has less free space to work with. Real write amplification on a consumer drive with reasonable free space is modest, but on a drive run at 95% capacity it can be severe.
The practical mitigation is to leave 10 to 20% of the drive free. That costs you capacity you paid for, which is annoying, but it both extends endurance and keeps sustained write performance from collapsing. If you are sizing a purchase, buy the capacity that lets you do that comfortably rather than the one that just fits.
Questions
Does the drive die when it reaches its TBW?
No. It means the endurance half of the warranty has been used up. Drives in endurance testing routinely write several times their rating before failing, and most consumer SSDs enter a read-only state rather than losing data when flash finally wears out.
How much do I actually write per day?
Most desktop users write 10 to 50 GB a day. You can read the real figure from the drive's SMART data: look for total host writes and divide by the power-on days. Gaming installs and video work push it higher, ordinary browsing and office use lower.
Which expires first, the years or the terabytes?
For almost all consumer use, the years. A five-year warranty on a 600 TBW drive is used up on time long before a 50 GB daily write rate reaches the endurance limit. Heavy write workloads are the exception, and they are what enterprise drives exist for.
Does write amplification change this?
Yes, and the calculator does not model it. The flash writes more than the host asks for, especially on a drive kept nearly full, so the real wear can exceed your host writes. Leaving 10 to 20% free space is the practical mitigation.
Is TBW comparable between drives of different sizes?
Not directly. A larger drive spreads the same wear over more cells and so earns a higher TBW at the same endurance class. Convert to DWPD to compare fairly.