Changes

The Gotek drive (with a FlashFloppy or HxC firmware) has a special direct access mode that allows it to be used as a poor's man hard drive, offering access to up to 32GB 32 GB of storage space. It is accessible via the track 255. [https://hxc2001.com/download/floppy_drive_emulator/SDCard_HxC_Floppy_Emulator_Direct_Access_mode.pdf Source]

This is a great feature as it alleviates the need for another mass storage expansion. And the relative slowness of this solution compared to a proper mass storage device (~10KB10 KB/s vs ~50KB50 KB/s) is not much of an issue on Amstrad CPC.