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Did the trick for my GBA Everdrive where other Formatter tools had failed.
Glad this was still here. Over 10k of my Homebrew related (GBA/DS/Atari/VB/PC/Linux/etc) files are now gone forever as the admins for GBAtemp decided to delete Filetrip.net. This utility from Panasonic was always the recommend tool for setting-up/fixing SD cards. Happy to know it helped and that you were able to find the download.