About this test
This test writes temporary files to the browser's private file system and IndexedDB, reads them back and calculates throughput. It also reports how much space sites may use and whether storage is persistent. Browser overhead makes results lower than raw disk benchmarks, but a very slow result can point to a failing or nearly full drive.
How to use this test
- Choose a test size. Larger sizes give steadier results.
- Press Run storage test and wait for each storage type to finish.
- Compare write and read speeds. Test files are deleted automatically.
Frequently asked questions
Why is this slower than my SSD's rated speed?
The browser adds encryption, sandboxing and copying. Use the results to compare devices rather than as absolute disk speed.
Is any data left on my device?
No. All test data is deleted as soon as each test ends.