fread(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
fseek(f_fsc,-sizeof(EMUFS_FSC)*2,SEEK_CUR);
fwrite(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
fread(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);
fseek(f_fsc,-sizeof(EMUFS_FSC)*2,SEEK_CUR);
fwrite(&gap_new,sizeof(EMUFS_FSC),1,f_fsc);