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ADF On-The-Go - convert your RPi Zero to Gotek-ready USB disk

Project description

ADF On-The-Go

ADF On-The-Go (adfotg) is a HTTP service designed for use in a Raspberry Pi Zero which is connected through its USB OTG port to a Gotek Floppy Drive emulator in use in an Amiga computer. It allows to feed the Gotek with fully programmable contents using a human-friendly user interface that can be accessed from any web browser. It can prepare ADF images from files, split big files into floppy-size chunks or just serve the ADF images directly. It allows to store a bundle of ADF files on its own drive and swap them freely.

  ----------- Linux ------------  USB  --------- IDE ---------
  | ADF OTG |------>| RPi Zero |------>| Gotek |---->| Amiga |
  -----------       ------------ no+5V ---------     ---------



This line will connect the voltage from the Raspberry Pi and power up your Gotek and your Amiga. When Amiga PSU is OFF, the Amiga will be put in a strange half-state with LEDs lighting up but the computer remaining off. The RPi will also reboot. When Amiga PSU is ON, the +5V USB line will prevent the Amiga's Power LED from dimming when Amiga reboots.



This is important! There's no security provided by the app itself!

It doesn't even put a basic HTTP authentication in place. When you host it on your device, keep it in a private network without remote access.

This software requires 'root' privileges to perform certain operations. While the application will run as a normal user, it will abuse sudo to obtain root privileges when needed. Ensure your RPi user can sudo without password prompt.



  • Python 3
  • mtools
  • sudo privileges


  • Raspberry Pi Zero
  • Gotek
  • An Amiga


This program is designed to be run on a Raspberry Pi Zero with the Raspbian Operating System. Installing the release package on anything else is not recommended, although will succeed and should be harmless (no warranty).

Provided you have the Raspberry Pi Zero, do the following:

  1. pip3 install adfotg
  2. mtools are also essential


  sudo apt update && sudo apt install mtools python3-pip
  sudo pip3 install adfotg


  sudo pip3 install -U adfotg

adfotg needs to be restarted now. If you integrated it with your Raspbian (see the section below), then it's sufficient to do this:

  sudo service adfotg restart

Integrating with Raspbian

After pip3 install:

  sudo adfotg --install

This will:

  1. Add 'adfotg' system user to Raspbian and allow this user a password-less sudo privilege.
  2. Create adfotg's default config file in /etc/adfotg.conf.
  3. Create adfotg's base directory at /var/lib/adfotg.
  4. Add adfotg.service to systemd; adfotg will start with the system.

Preparing your Raspberry Pi

This is mandatory. Follow the instructions from to enable dwc2 and g_mass_storage modules.

Hereby is a copy of the excerpt from the guide with adjustment for g_mass_storage module.

  1. We need to make sure we are using the dwc2 USB driver echo "dtoverlay=dwc2" | sudo tee -a /boot/config.txt
  2. Enable it in Raspbian echo "dwc2" | sudo tee -a /etc/modules
  3. Now pick which module you want to use from the list above, for ADF OTG we need g_mass_storage, so: echo "g_mass_storage" | sudo tee -a /etc/modules.
  4. Reboot your RPi.

In case of trouble connecting with Gotek, you may try to diagnose some problems by connecting the RPi to an USB socket in a PC. When an USB drive image is mounted, the PC should see the RPi as an USB drive.


Please see


Problem: Gotek perpetually displays --- when connected to RPi, even though it works with my usual USB drive.

Solution: --- indicates that you have Cortex firmware installed on your Gotek. See if you have SELECTOR.ADF on your USB drive. If yes, this ADF must also be placed on every mount image you create in adfotg.

Problem: I upgraded to a new version, but there are oddities happening or I don't see any changes.

Solution: There may be two reasons for this. Your browser might've cached the old version of the site or the adfotg service wasn't restarted. See the "Update" section in README to learn how to restart the service and clear your browser cache.


Gotek is a hardware floppy-drive replacement for legacy machines. Instead of using failure-prone floppy disks, it allows to use a USB flash drive with floppy-disk images. Multiple images can be stored on a single flash drive and Gotek allows by default to choose between them through buttons located on the case. While Gotek is an excellent device that eradicates the inconvenience of floppy disks, it not only doesn't solve the inconvenience of disk swapping but makes it worse by replacing labeled floppy-disks with incomprehensible ordinal numbers (from 0 to 999).

Raspberry Pi Zero is a cheap mini-computer that can run Linux. It has two major features that are in use in this project:

  • WiFi
  • USB On-The-Go

While WiFi (or any Ethernet connection) is used here as the access layer to the ADF On-The-Go software, USB On-The-Go is the real enabler. While it has many applications, we are only interested in one. It allows to make the RPi appear to be an USB flash drive - a flash drive which contents we can fully control and change on-the-fly using Linux command line tools and which we can program to serve the content we want.

Guide for setting up OTG mode on Raspberry Pi can be found here:

amitools contains xdftool, with which adfotg is capable of manipulating ADF image files to some extent.


REST API documentation is currently a Work-In-Progress. adfotg is capable of providing the documentation for itself in a plain-text format through the /help endpoint.

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