CachyOS Apps

Install F3 on CachyOS

Simple tool that tests flash cards capacity and performance to see if they live up to claimed specifications.

From the official CachyOS repo. Install with pacman, no AUR helper needed.

Reviewed Nov 2, 2026 · independent guide · Read the F3 guide

How do I install F3 on CachyOS?

Run this in a terminal:

sudo pacman -S f3

f3 is in the cachyos repo, the CachyOS project's own package repository, so pacman installs it directly with no AUR helper and no build script. The package is signed with the CachyOS repository key, and pacman checks the signature before it installs.

What should I do after installing F3?

  1. It installs these commands: f3brew, f3fix, f3probe, f3read and f3write.
  2. Run pacman -Qi f3 to see the installed version and the optional dependencies.

Full F3 guide: first run, key settings, common fixes and uninstall

How do I update or remove F3?

Update:

sudo pacman -Syu

Remove:

sudo pacman -Rns f3

What is F3?

F3, Fight Flash Fraud.

Package description: Simple tool that tests flash cards capacity and performance to see if they live up to claimed specifications

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    From GitHub

    AltraMayor/f3 · ★ 3,444 stars · last commit Oct 26, 2026 · latest release May 1, 2026

    Real issues opened by users on the project's GitHub, shown as written with a link to each one. 10 most reacted issues opened in the last two years plus the 5 newest issues, bots, pull requests, non English and political posts skipped, capped at 15 per repo. Fetched Nov 1, 2026.

    1. Developed a GUI for f3Closed

      Hello! I'm not a real programmer and I'm still very new to this. However, I thought creating a GUI would be a good idea, so I created one for f3. I built it with AI and am publishing it on my GitHub page. You might want to check it out. This is the project page: I tested it on my…

      @shampuan · · 2 reactions · 2 comments · View on GitHub

    2. macOS + exFAT: F3 produces false corruption due to fsync semantics and POSIX_FADV_DONTNEEDOpen

      When running F3 on macOS with exFAT-formatted devices, the tool may report systematic data corruption (typically exactly one cluster, e.g. 128 KB = 256 sectors) even on brand-new, healthy storage. After extensive investigation, this appears to be a tool–OS–filesystem semantic…

      @luoqiangwei · · 2 reactions · 0 comments · View on GitHub

    3. Supplemental project Fight Phone FraudOpen

      Hi I don't see a Discussions tab but I wanted to say thanks I love this tool and I also built (vibe coded) a similar project for phones. Fight Phone Fraud. I linked a shout out to F3 in the README and would love to add one here for F3p if you approve or if people are interested.…

      @jboero · · 1 reactions · 1 comments · View on GitHub

    4. New graphical interfaceClosed

      I've been working on a new graphical interface that can be installed via flatpak. If you like it, it might be interesting to leave a link to the project, in case anyone wants to try it. or

      @dantavares · · 1 reactions · 2 comments · View on GitHub

    5. NVME passes f3probe, but killed by f3writeClosed

      I bought a 3-pack of these drives last summer and the first drive died in a laptop shortly after use. I just found f3probe and attempted to check the second one, which came out as a good 2TB drive within seconds. Running f3write it appears to be good until you start hitting the…

      @sweBers · · 1 reactions · 5 comments · View on GitHub

    6. 2x Scam SSDs that trick f3probe (but not f3write) - avaliable to anyone who wants to use them to improve f3Closed

      I gout a couple of "4TB" SSDs off of ebay that turned out to be scams. They defeated f3probe, convincing it that they were legitimately 4TB (and ValiDrive, via an enclosure), but the one I tried f3write on failed at 123GB, so I'm guessing it's actually an 128GB drive. (It appears…

      @nfriedly · · 1 reactions · 7 comments · View on GitHub

    7. build fails on 32 bit architecturesClosed

      Debian still builds all packages for a couple of 32 bit architectures. Someone just filed a "fails to build from source" (FTBFS) bug against f3 in Debian, where it fails to build on i386 and armhf: The relevant error seems to be: here's the full build log: I believe this is a…

      @anarcat · · 1 reactions · 1 comments · View on GitHub

    8. insufficient memory on armhf platformOpen

      I'm successfully using f3probe on my laptop. Thank you for this great tool. I recently set up a Banana Pi SBC computer (armv7 armhf) and thought it would be cool to test this tool out on that platform. Agreed, the SBC is fairly limited but I thought 1GB of RAM and an additional…

      @leggewie · · 3 comments · View on GitHub

    9. f3read requires O_DIRECT on Cygwin to avoid reading cached dataOpen

      The method used to avoid that f3read reads previously cached data does not work on Cygwin. This may result in false positive tests. Here is the local patch used for the new Cygwin package f3-8.0-2: BTW: It may make sense to use the (non-POSIX) flag ODIRECT on all platforms…

      @chrfranke · · 2 comments · View on GitHub

    10. Coud you release a new tag?Closed

      Dear maintainer(s), the last tag seems to be from 2020, while there is activity in the repository. Any plans on tagging a new release? Kind Regards, Johannes

      @kastl-ars · · 2 comments · View on GitHub

    11. f3probe suitable for USB HDDs?Closed

      Sorry for that (maybe) silly question, but is f3probe suitable for checking an external HDD's real size, or is this feature limited to flash block devices like SSDs, SDcards and USB Sticks? I checked my new external HDD (WD-RD37SY5G SATA6 disk being connected to USB3.2 Gen1x1 via…

      @just-Nob · · 1 comments · View on GitHub

    12. macOS: The ETA in f3write 10.0 is incorrect.Open

      Since updating to f3 10.0, running f3write on a 16GB micro SD plugged into an SD card reader via a USB hub throws up a ridiculous ETA like the one below. When I rolled back to f3 9.0, it showed this ETA instead. Seems like a bug with the f3write ETA, at the very least. Has anyone…

      @Chamiu · · 4 comments · View on GitHub

    13. Version difference when recompilingClosed

      Hello, I maintain the f3-gui project. I need to ask here, i don't know if this has been explained before, but since the flatpak version compiles from scratch and includes everything in the same package, I noticed that even in version 9, f3-probe still shows that it's version 8,…

      @dantavares · · 7 comments · View on GitHub

    14. Windows port for this found.Open

      I don't want to have to learn Docker to use this on Windows. A windows version would be great!

      @bulrush15 · · 1 comments · View on GitHub

    15. f3read/f3write can't work on arm due to unaligned pointersClosed

      f3read/f3write can't work on ARM due to use of unaligned pointers For example, in f3write's fillbuffer function, the void buf parameter is an unaligned pointer, which is unceremoniously cast to a uint64t , and then written to. This is undefined behavior in C -- pointers must be…

      @skrap · · 4 comments · View on GitHub

    F3 on CachyOS: questions

    Is F3 in the official CachyOS repo?

    Yes. The f3 package is in the cachyos repo, version 10.0-1, built 2026-05-04. Install it with sudo pacman -S f3.

    Do I need an AUR helper for F3?

    No. It comes from the cachyos repo, so plain pacman installs and updates it, and sudo pacman -Syu keeps it current.

    What is the F3 command?

    The package installs f3brew, f3fix, f3probe, f3read and f3write.