Fix the Samsung T7 slow write-speed bug in one click

Because the app isn’t distributed through the Mac App Store, macOS Gatekeeper shows a warning the first time you open it. This is expected for any self-distributed macOS app.

To get past it:

1. Right-click (or Control -click) the app and choose Open .
2. Click Open in the dialog that appears.

Or open System Settings → Privacy & Security and click Open Anyway after the first blocked launch attempt.

Apple requires a paid Developer Program membership ($99/year) to distribute apps that run privileged operations silently. This app skips that, so macOS prompts for your password each time instead.

The password is used only to repartition the drive. It’s never stored or transmitted anywhere.

That partition is the fix. Creating it is what resets the T7’s internal state and restores full write speed, and it only needs to exist for a moment.

The app unmounts it automatically within a second or two of creation, and it stays hidden from Finder afterwards, including across reboots and replugs.

Your data is not touched. The fix carves a small amount of free space into a new partition; it never reads or writes the contents of your main APFS volume.

That said, it’s your data. Keeping a backup of anything irreplaceable is always a good idea, regardless of which tools you use.

No. The slowdown is a firmware-level issue with the T7 series, and the fix doesn’t change the firmware. If the slowdown comes back, just run the app again.

Worth trying, but don't count on it as a permanent fix. Updating your T7's firmware via Samsung Magician (opens in new tab) might reset the internal state that causes the slowdown, but the bug has not been fixed so far, so the slowdown will likely return eventually. Still, keeping the firmware up to date is good practice, and it's a reasonable first step before reaching for T7 Speed Restore .

Yes, you can. There’s nothing magic going on under the hood: the fix is just creating a small extra partition on the drive. You can do exactly that in Disk Utility, or with diskutil on the command line.

The catch is that the slowdown is firmware-level and comes back after a while. So you’d be opening Disk Utility, picking sizes, formatting, mounting, and cleaning up again every time. T7 Speed Restore exists so that next time it happens, you click one button instead.

No. exFAT-formatted T7 drives are not supported. Neither are NTFS or other Windows-only setups. If your drive shows up as exFAT in Disk Utility and you don’t need it on Windows, reformat it as APFS first (this erases the drive, so copy your data off beforehand).

This app is macOS-only, but Windows has a built-in fix that needs no third-party tools. Open Device Manager , expand Disk drives , right-click your T7 and choose Properties . On the Policies tab, switch from Quick removal to Better performance and enable Write caching on the device , then click OK. Restart if prompted and you should be back to full speed.

The drive must have no extra partitions after the main APFS volume. If you’ve added any manually, remove them in Disk Utility first, then run the fix.

Yes. The full source is on GitHub (opens in new tab) under the GPLv3 licence. Issues and PRs are welcome.

You can reach me at or open a GitHub issue (opens in new tab) if you prefer.

Either way, if you can include your macOS version, your T7 model and capacity, and the benchmark numbers before and after running the fix, that’s really helpful. Even better: attach the app’s log file. To find it, open Finder , press Shift + Command + G , paste in /tmp/t7fixer-debug.log , and hit Enter. Then either sent me that file or copy + paste its content in your message.