How to test a used laptop's storage performance

A used laptop can look fine but feel slow when you open files, install apps, or start up. Testing its storage gives you a useful clue about how quickly it can read and write data before you buy it.

The Storage Test measures large-file speed and small-write speed in your browser, then gives a score out of 100. It does not inspect the seller's files or prove that the drive is healthy, so use the result alongside a few practical checks.

Test the laptop's storage

Open the Storage Test on the laptop you are considering. If you are also checking the rest of the computer, see how to test a used laptop before buying it.
Ask the seller to close file transfers, downloads, game launchers, and other apps that may be using the drive. If possible, connect the laptop to power.
Follow the test's on-screen instructions and let it finish. Avoid opening or copying files while it runs, because other disk activity can affect the result.
Note the score, large-file speed, and small-write speed. Run the test a second time under the same conditions and see whether the results are reasonably similar.
Use the laptop for a few minutes as well. Open a folder, launch an app, and notice whether it responds promptly or pauses, freezes, or makes unusual clicking sounds.

One run is only a snapshot. A nearly full drive, background updates, or a file copy can make a healthy laptop test slower than usual.

What the result means

The score is high and the runs are similar

The drive handled this browser test consistently. That is a good sign for everyday use, but it does not guarantee the laptop has no drive errors or that it will remain reliable. Check the drive's capacity and condition separately before you buy.

Large-file speed is good, but small writes are slow

Large-file speed reflects work such as copying a movie. Small writes matter when the computer saves lots of little pieces of data, such as app settings or browser files. A weak small-write result can make everyday tasks feel sluggish even if large files copy quickly.

Both speeds are low

The storage may be slow, busy, nearly full, or affected by a power-saving mode. It may also be an older hard disk drive rather than a solid-state drive. Ask what type of drive is installed and compare the result with another laptop of a similar model under similar conditions. Do not judge it from the score alone.

The results change a lot between runs

Another process may be using the drive, or the laptop may be slowing down during the test. Close background apps, wait for updates or file copies to finish, then test again. If the laptop also freezes or pauses during ordinary tasks, treat that as a warning sign.

The score looks fine, but the laptop still feels slow

Storage is only one part of performance. A slow processor, low memory, overheating, or too many startup apps can also cause delays. Try the laptop with a few everyday tasks before deciding, rather than relying on one storage score.

How to get a more reliable result

Check for background work. Wait for updates, downloads, backups, and file copies to finish. On Windows 11, open Settings › Windows Update to see whether updates are in progress. On macOS, check whether an app is downloading or copying files before you test again.
Check available space. A drive with very little free space may perform poorly. On Windows 11, open Settings › System › Storage. On macOS, open System Settings › General › Storage. If the drive is nearly full, ask the seller what is taking up space and whether it can be cleared safely.
Connect the charger. Some laptops reduce performance on battery power. Plug in the charger, wait a minute, and repeat the test. If you cannot test while plugged in, note that the result may not reflect performance at full power.
Restart and test again. A restart can stop a stuck background task from affecting the result. Give the laptop a moment to finish starting up before running the test.
Compare the drive with its advertised type. Ask whether the laptop has an SSD or a hard drive and check the model or specifications. If the installed drive does not match what the seller claimed, ask for an explanation before paying.

When the storage may be failing

A low score by itself is not proof that a drive is damaged. More concerning signs include repeated freezes while opening files, files that fail to copy, error messages about the drive, or unusual clicking from a mechanical hard drive. A solid-state drive usually does not make mechanical clicking sounds.

If you see these signs, ask the seller to run the laptop maker's drive diagnostics and show you the result. Do not rely on a benchmark to clear a drive that reports errors. If the laptop is still under warranty, confirm what the warranty covers. Otherwise, factor in the cost of a replacement drive and any work needed to install it, or choose another laptop.

Why the score is not a drive health check

A speed test measures how quickly the drive handles the test's reading and writing tasks. It does not check every part of the drive, predict when it will fail, or confirm that your data is safe. A fast drive can still be worn or damaged, and a slow drive can be healthy but older or busy.

For a fair comparison, test similar laptops with the same tool, plugged in, and without other disk activity. The Storage Test runs in your browser and measures storage performance on the laptop being tested.