The .MCD extension is a proprietary memory card format. It is primarily used by specific emulator ecosystems, most notably Bleem! (a historic commercial PS1 emulator) and certain configurations of the FPse mobile emulator for Android. Why Convert?

If you are into retro gaming, you have likely run into the headache of conflicting save file formats. Both .MCR and .MCD are virtual memory card formats used by PlayStation 1 (PS1) emulators, but they are not always interchangeable out of the box.

If your file is not exactly 128 KB, the conversion will fail.

Let’s walk through the safest method using . Ensure you have a backup before starting.

No. Standard converters only alter the outer container format to make it readable by different emulation engines. The core gameplay data remains completely untouched. However, it is always best practice to create a backup copy of your original file before initiating any conversion. Can I use these files on a real PS1?

Have a specific world that won't convert? Leave the error code below, and the community will help you debug your MCR to MCD conversion process.

: The file header might be damaged, or the emulator that created the file used a non‑standard header format. Solution : In MemcardRex, use Edit → Fix File Header (if available) or export each save individually, then create a new clean memory card and import the saves one by one.

Change the .mcr at the end of the filename to .mcd (or vice versa).

Have you used an MCR to MCD converter in a recent migration? Share your experience with the community below.