Small-write speed drops in a warmer room: what to check

Your drive’s small-write result changed after you moved your computer into a warmer room. Small writes measure how quickly storage handles many tiny operations, and the score can shift with heat, power settings, or other activity on the computer.

Compare the same drive under similar conditions with the Storage Test. A lower score is a useful clue, but it does not tell you the drive’s temperature or prove that heat caused the change.

Compare small-write results fairly

1. Open the Storage Test on the computer and drive you want to check. Keep the computer plugged in if that is how you normally use it.
2. Close downloads, file copies, backups, game updates, and other tasks that may be using storage. Wait until the computer is mostly idle.
3. Run the test and note the small-write result. Also note the large-file result, the room conditions, whether the computer is plugged in, and which drive you tested.
4. Repeat under comparable conditions in the warmer room. Use the same computer, drive, browser, power state, and connection. Avoid running repeated tests back to back if the computer or drive already feels hot.

If you have a result from before the move, compare it with the new result. If you do not, use the first run as a baseline, then repeat after giving the computer time to cool. A single run can vary, so look for a consistent difference rather than treating one score as a verdict.

What the result means

Small writes are slower, but large-file speed is similar

The difference is concentrated in the test’s small-write work. Heat may be one factor, but background storage activity, power limits, and normal variation can also affect this result. Repeat the comparison when the computer is cool and idle before blaming the warmer room.

Both small writes and large-file speed are lower

Look beyond small-write behavior. A busy or hot computer, a changed power mode, or a slower connection to an external drive could affect more than one result. Check that you tested the same drive and port, and compare again after the computer has cooled.

The result improves after cooling

That supports the idea that heat or workload contributed, but it does not identify the exact cause. A warm room can reduce the cooling headroom available to a drive or computer, especially during sustained activity. The drive’s own temperature and limits depend on its model and design.

The scores change between runs without a clear pattern

Small changes can come from background tasks and differences in the computer’s state. Run another comparison later when the computer is idle. If the difference is small and ordinary file use feels normal, the score alone is not a reason to replace the drive.

How to check for other causes

1. Let the computer cool before testing again. Stop heavy tasks and leave the computer idle for a while. Put a laptop on a hard, flat surface, not a bed or blanket that can block its vents.
2. Check for storage activity. On Windows 11, open Task Manager with Ctrl + Shift + Esc and look for apps using the disk. On macOS, open Applications › Utilities › Activity Monitor and check for active processes. Let a backup or update finish before comparing results.
3. Keep the power mode consistent. On Windows 11, check Settings › System › Power & battery › Power mode and use the same mode for both runs. On a Mac laptop, check System Settings › Battery and keep Low Power Mode in the same state. Power-saving settings can change performance.
4. Check the drive’s airflow and placement. Keep vents clear and avoid trapping an external SSD under papers or inside a closed case. Do not put a drive in a refrigerator or use ice packs, which can cause condensation and damage electronics.
5. Reconnect an external drive directly. If you are testing an external SSD, use the same cable and port for each run. Try a different computer port without a hub if results remain low, but change one thing at a time so the comparison stays useful.
6. Check available storage and ongoing maintenance. A drive that is nearly full or handling cleanup, indexing, or updates may behave differently. Make room only by removing files you no longer need, and keep a backup before making major storage changes.

When it may be a drive problem

A slower score in a warm room by itself does not confirm a failing drive. Take it more seriously if the slowdown persists when the computer is cool and idle, or if you also see freezes, file errors, repeated disconnects, or warnings from the operating system. Back up important files before further troubleshooting. If an external drive disconnects when warm, test it with another cable and port. If the same symptoms follow the drive, contact the seller or manufacturer about warranty service. For more on heat-related SSD slowdowns, see why SSD speed drops during thermal throttling.

What the browser test cannot tell you

The Storage Test measures storage performance, including large-file speed and small writes, and reports a score. A browser test cannot read the drive’s exact temperature or diagnose its internal health. Treat the result as a comparison of performance under the conditions you tested, not as a direct temperature reading or a complete hardware diagnosis.