Problem with fformat ("M:SD_CARD /FAT32");

Hello dear friends

i use fopen , fclose and other function without any problem

but when i use fformat("M:SD_CARD /FAT32) or ("M:SD_CARD /WIPE)

it makes my SD card's format corrupts !
and i cant use my sd card until format it by windows .
my driver is "MCI_LPC17x_8x"
so way other functions work fine but this function is not?

thank for help

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