Failed to mount fat partition in sd2sp2

[vizkoze]

Hello, I'm experiencing a problem with gcmm when trying to mount my SD card.
It displays an error saying it failed to mount fat partition on sd2sp2.
I'm new to gamecube homebrew but I successfully loaded swiss 0.6 which is on that SD card.
SD card is formatted as fat32 under Linux.
Swiss loads ok, Iso files load successfully.
Memory card emulation in Swiss works and i wanted to transfer my save games from memcard to emulated mem.

I placed gccm dol in a subfolder /homebrew/gcmm.dol not on the root of the SD card.
Launching gcmm is ok but it doesn't recognize the fat partition.
Any clues as what might be wrong?

[vizkoze]

checking back in to update on the problem.
apparently, my sdcard was formatted using GPT partition table and was not recognized by gcmm.
after reformatting in gparted under linux with msdos (mbr) partition table and a fat32 partition, everthing works.
With the gpt partitiontable, i was also experiencing problems with other homebrew like vbagx. with MBR partitiontable everything is recognized.
It must have something to do with the library that you use to read fat.