打印SD卡参数与读写测试SD卡拥有超大的存储容量，一般用来保存检测传感器数据与系统参数
如温湿度数据等，通常保存的数据要加上时间戳1112134SerialprintlnSerialprintlnvolume.blocksPerCluster()*volume.clusterCount()/2/1024/1024.0fileName.txtSerialprintlnfileName.txtfileName.txthello worldTRUEfileName.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