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各位好，自制的电路板（电路板用的AM3358，硬件参照BBB修改，SDK为TI SDK6.0，rootfs改为busybox，系统从tf卡启动）上，有很小部分的TF卡（<0.5%）中的MBR数据被改写了，导致系统无法正常启动，请问什么情况会导致这个问题？然后如何规避？
