How to compare storage performance before upgrading

Planning to replace a slow drive, add storage or move to a faster SSD? Take a baseline before you change anything. Without one, it is hard to tell whether the upgrade improved the tasks that matter or whether a different test setup changed the result.

The Storage Test measures large-file speed and small writes in your browser, then gives an overall score. Use it before and after the upgrade under similar conditions. The result is a useful comparison, not a complete measurement of every drive or proof that a drive is healthy.

Record a storage baseline

1. Open the Storage Test on the computer you plan to upgrade. Run it before moving files, changing the drive, or reinstalling the operating system.
2. Keep the setup consistent. Use the same computer, browser and power source for each run. Close large downloads, file copies, cloud sync and apps that are busy reading or writing files.
3. Run the test and write down the overall score, large-file speed and small-write result. If the test shows units, record those too. Note the date, browser, whether the computer was plugged in, and what drive setup you had at the time.
4. Repeat the test two more times without changing anything. Save each set of results rather than choosing the best number. A group of runs helps show whether the result is steady or varies from one attempt to another.
5. After the upgrade, repeat the same runs in the same browser and under the same power and workload conditions. Compare each result with your baseline, not with a score from a different computer or a different test setup.

A simple note is enough: for example, record the three scores, the large-file results and the small-write results in a text file. Include which drive you changed and how it is connected. If you replaced a drive but also changed the USB enclosure, cable or port, note that too, since those parts can affect the result.

What the result means

The score and both speed results improve

The upgrade improved the storage performance this browser test measures. A larger gain in large-file speed may help with transferring big videos or archives. Better small-write results may matter more for tasks that create or update many small files. Your everyday experience can still depend on other factors, such as the application, processor and available memory.

Large-file speed improves, but small writes barely change

The new drive may be better at moving continuous data than at small operations, or the test may be limited by the browser or connection path it uses. This can still be a meaningful improvement for large transfers, but it may not make every app feel faster. Compare a task you actually care about, such as opening a project or copying a folder with many small files.

The overall score changes, but the speed results look similar

Treat the score as a compact comparison, not a separate promise about performance. Look at the individual results and repeat the test if the score changed by a small amount. A modest difference between runs may reflect normal test variation rather than a clear upgrade.

The results vary widely between runs

Something may be using storage in the background, or the computer may be changing power or temperature behavior. Close other programs, let any file transfers finish, and run the tests again. Browser storage benchmarks can vary between runs, as explained in why storage benchmark results vary in a browser.

The new drive does not seem faster

First check whether the test is measuring the drive you changed. A browser test measures storage through browser-accessible data, and that does not always mean it can target a particular physical drive. A result may therefore fail to reflect an external drive or a secondary disk. Check the connection and test the drive with a suitable direct measurement before deciding that the hardware upgrade made no difference.

How to get a fair comparison

1. Use the same power conditions. Keep a laptop plugged in for every run. On Windows 11, check Settings › System › Power & battery › Power mode. On a Mac, check System Settings › Battery › Low Power Mode. Keep the setting the same before and after the upgrade.
2. Finish background work first. Pause large downloads, file copies and cloud synchronization. On Windows 11, open Settings › System › Storage to check whether storage cleanup or other activity is underway. On macOS, check System Settings › General › Storage if the system is managing or moving a large amount of data.
3. Leave room for temporary test data. A nearly full drive can affect normal computer use, and the browser needs space for its test data. Make sure there is reasonable free space before comparing results. Do not delete files you need just to improve a benchmark score.
4. Keep the browser setup unchanged. Use the same browser profile and avoid switching between private browsing and a normal window. Browser settings and storage permissions can affect what a web test can do. If the test behaves differently after the upgrade, check the browser's site permissions before assuming the drive is responsible.
5. Check the physical connection. For an external drive, reconnect it and use the same cable, port and enclosure for both comparisons when possible. A hub, adapter or slower port can limit results even when the drive itself is fast.
6. Restart and retest if results remain inconsistent. A restart can clear stuck background activity. After signing back in, wait for startup tasks and syncing to settle, then repeat the same runs.

Know what the browser test can tell you

The Storage Test is useful for comparing browser-accessible storage performance on the same computer. It reports large-file speed, small writes and a score out of 100. It does not give a complete specification for a drive, identify every possible bottleneck, or certify the drive's health. It also cannot guarantee that a browser test uses a specific physical disk when several drives are installed.

The test uses temporary browser data rather than your personal files. That makes it suitable for a quick comparison, but its results are not the same as copying your own project files or running a dedicated test directly against a selected drive. See why browser storage tests use temporary data for more about that distinction.

If you are deciding whether to upgrade, compare the repeated baseline and post-upgrade results alongside the tasks that feel slow. A faster benchmark matters most when it improves the work you actually do.