The Atari Falcon IDE interface stores its data in Big-Endian format (as was natural for a 68030-based computer), but unfortunately it quickly became the standard to store IDE data in Little-Endian format.

Using modern removable media such as CF cards and SD cards with adapters on the IDE interface to your Falcon is common, but it's inconvenient to mount them in modern machines because of the need to image the media and byteswap it in software even though common Atari hard disc drivers, like HD Driver allow the partitions to be read on Windows and MacOS as well as the Falcon.

This board dynamically swaps the bytes in hardware without the register-breaking changes that a traditional 'twisted cable' approach applies. This means that you can auto-boot HD Driver from a byte-swapped SD or CF card, partition it with dual Atari/Windows partition compatibility and load the same SD card directly in your Windows or MacOS machine to copy files at pace.

See my YouTube video on this project at https://youtube.com/@thetechnoshed

Source and precompiled JED firmware: https://github.com/dh219/IDE_Adapter_Autoswap

This project uses a Xilinx CPLD which will require programming with a suitable adapter cable or via Raspberry Pi.