TBW stands for terabytes written: the total amount of data a maker says you can write to an SSD over its life while it stays within warranty. For most gaming PCs it barely matters, because normal use writes only a small fraction of the rating, and drives usually last well beyond it.
As an Amazon Associate we earn from qualifying purchases at no extra cost to you.
Top 3 picks at a glance
What TBW Means
Flash memory cells wear out slowly each time they are erased and rewritten. Makers estimate how much data a drive can take and publish that figure as TBW. Larger drives have more cells to spread writes across, so a 2 TB model has a higher TBW than a 1 TB model of the same line.
Warranties are typically stated as a number of years or the rated TBW, whichever comes first. Once either limit is reached, the maker’s warranty no longer applies. TBW is a lifetime total over the warranty period, not a per-year allowance.
TBW and DWPD
Enterprise datasheets often use DWPD (drive writes per day) instead. It describes how many times you could overwrite the whole drive each day through the warranty period. The relationship is simple: DWPD equals TBW divided by capacity in terabytes, 365 days and the warranty years. A 1 TB drive rated for 1 DWPD over five years works out to 1,825 TBW.
Quick Reference Table
| Example drive | Capacity | Rated TBW | Approx. DWPD over 5 years |
|---|---|---|---|
| Samsung 980 Pro | 500 GB | 300 | About 0.33 |
| Samsung 980 Pro | 1 TB | 600 | About 0.33 |
| Samsung 980 Pro | 2 TB | 1,200 | About 0.33 |
| Samsung 990 Pro | 1 TB | 600 | About 0.33 |
| Samsung 990 Pro | 2 TB | 1,200 | About 0.33 |
| Samsung 990 Pro | 4 TB | 2,400 | About 0.33 |
These figures come from the maker’s published endurance ratings as summarized by review and guide sites. Always read the exact figure on the datasheet for your model, because ratings differ between product lines and capacities.
Why It Matters for Gaming PCs
Gaming is mostly reading. Loading a game or level reads data from the drive; writes happen for installs, updates, shader caches, save files, browser activity and the operating system. Installing a large game writes its full size once. Even a heavy user who installs a lot of titles rarely writes more than a few dozen gigabytes per day on average.
At 20 to 40 GB per day, a drive with a 300 TBW rating would take decades to reach its limit, based on simple arithmetic that guide sites use. For example, 300 TB divided by 40 GB per day is about 7,500 days, or more than 20 years. Most gamers replace their drives for capacity or speed long before reaching their TBW.
TBW Is Not a Failure Point
The rating is a warranty limit, not the moment a drive dies. Guide sites note that many SSDs survive far beyond their rated figure. One endurance test reported by a technical site found a Samsung 990 Pro 2 TB exceeding 20 to 31 petabytes of host writes, many times its rated 1,200 TBW. That is a single test of one drive and may not reflect every unit, so treat it as an illustration, not a promise.
Reaching the rated TBW does not make the drive stop working, but the maker no longer covers it, and reliability may decline as cells wear. Keep backups regardless of rating.
How to Check TBW on Your Own System
- Find the rating. Look up your exact drive model on the maker’s product or support page. The datasheet lists TBW or DWPD and the warranty length.
- Check how much has been written. Maker tools, such as Samsung Magician, WD Dashboard and Crucial Storage Executive, display total bytes written and a health estimate for supported drives. Third-party tools such as CrystalDiskInfo read SMART data and show total host writes.
- Compare. Divide the written total by the rated TBW to see how much endurance has been used.
- Watch the trend. Check again after a month to estimate your daily writes.
SMART attribute names and units vary by maker, so some tools show data units or sectors instead of terabytes. Consult the drive maker’s documentation for how to convert. Run any maker tool from the official source only, and do not change firmware settings unless you understand the effect. Firmware updates can carry a risk of data loss if interrupted, so back up first.
Common Misconceptions
- “TBW is how many terabytes the drive holds.” No. Capacity is how much it stores; TBW is how much can be written over time.
- “The drive stops at its TBW.” It does not. The warranty ends, but the drive usually continues working.
- “Gaming wears out an SSD quickly.” Gaming involves mostly reads, so wear is low.
- “A higher TBW always means a faster drive.” TBW measures endurance, not speed.
- “QLC drives are unsafe.” QLC drives usually have lower TBW than TLC, but ratings still exceed normal desktop use.
When to Care and When to Ignore It
Care about TBW if you use the drive for heavy video editing, large project scratch files, database work, game development builds, constant downloads, or running virtual machines. In those cases, compare TBW ratings across models and pick a higher-endurance drive or a larger capacity, since more capacity gives a higher rating.
Ignore it for a typical gaming and browsing setup. Focus instead on capacity, sustained write speed, thermals, and whether the drive has a DRAM cache or a good controller. Make sure the warranty length fits your needs, and consider a heatsink for fast PCIe 4.0 and 5.0 drives.
If your tool reports a health value dropping quickly, reallocated sectors or media errors, back up your data right away and contact the drive maker. Do not keep writing to a failing drive.
Frequently Asked Questions
What does TBW mean on an SSD?
TBW means terabytes written. It is the total amount of data the maker says can be written to the drive under warranty. The warranty ends at that amount or at the stated number of years, whichever comes first.
How many TBW is good for a gaming PC?
Typical consumer ratings of a few hundred TBW are plenty. A 300 TBW drive would last decades at 20 to 40 GB of writes per day, so most gamers can pick on capacity and speed instead.
What happens when an SSD reaches its TBW?
The warranty usually stops covering it. The drive does not automatically fail, and many continue working far beyond the rating, but reliability becomes less certain, so keep backups.
How do I check how much has been written to my SSD?
Use the maker’s utility or a SMART reader like CrystalDiskInfo to view total host writes. Compare that number with the TBW on the drive’s datasheet.
Is TBW the same as DWPD?
They describe the same endurance in different ways. TBW is a lifetime total, while DWPD is a daily rate over the warranty. You can convert between them using the drive capacity and warranty years.
Does a bigger SSD last longer?
Generally yes, because a larger drive has more cells to spread writes across and carries a higher TBW rating in the same product line.
