Splitting .mc2 memory cards on Linux

I recently purchased a Memcard Pro2 for my PS2, it has a really cool feature where it can hotswap memory cards when games are loaded or when the Playstation 2 boots up.

I have a virtual memory card with FreeMcBoot mount on startup and then when I launch a game either via OPL or with a Disc, the Memcard Pro2 automatically mounts the game specific memory card. However, I've got an actual PS2 memory card with all my game saves and I had no idea how to go about transferring these over. The first thought was to create a virtual copy of my existing memory card:

Create a new Virtual memory card on the Memcard Pro2
Insert both into your PS2
Use the PS2 memory card browser to copy the saves from the old memory card to the virtual memory card

Now I've got a .mc2 file with all my saves on the Memcard Pro2's SD card! By using a program like MyMC++ I can browse the memory card:

# I use uv for python apps/packages since it makes managing them easier.
# This will take a while to launch initially while it installs!
uvx -v "mymcplusplus[gui]"

Using the MyMC++ GUI I can export each of the actual game saves off the .mc2 file into individual .psu files using export button in the header.

Once exported I created the following script in the same directory:

#!/bin/bash

for save in *.psu; do
  FILENAME=$(basename -- "$save")
  NO_EXTENSION=${FILENAME%.*}
  NO_PREFIX=${NO_EXTENSION#"BI"}
  GAME_ID=$(echo "$NO_PREFIX" | cut -f1 -d" " | cut -c1-10)

  MEMCARD_FOLDER="memcards/$GAME_ID"
  mkdir -p "$MEMCARD_FOLDER"

  MEMCARD="$MEMCARD_FOLDER/$GAME_ID-1.mc2"
  uvx mymcplusplus -i "$MEMCARD" format
  uvx mymcplusplus "$MEMCARD" import "$save"
  curl -s "https://raw.githubusercontent.com/niemasd/GameDB-PS2/refs/heads/main/games/$GAME_ID/title.txt" >"$MEMCARD_FOLDER/name.txt"

done

echo ""
echo "Done!"

This script loops over each of the saves, pulls the GAME_ID from the file name, and then creates a dedicated .mc2 folder & file for the game. Ready to add directly to the Memcard Pro2!

Once copied onto the SD card the dir tree should look like this:

OS
PS1
PS2
├ SLPM-66621
│ ├ name.txt
│ └ SLPM-66621-1.mc2
└ SLPM-55117
  ├ name.txt
  └ SLPM-55117-1.mc2

pfy.ch

Splitting .mc2 memory cards on Linux