static bool GetExternalStorage(std::string &path, const std::string &type = "");
static bool GetStorageUsage(const std::string &path, std::string &usage);
static int GetMaxSystemVolume();
static bool GetExternalStorage(std::string &path, const std::string &type = "");
static bool GetStorageUsage(const std::string &path, std::string &usage);
static int GetMaxSystemVolume();