装个MSDN吧
The GetVolumeInformation function retrieves information about a file system and volume whose root directory is specified.
BOOL GetVolumeInformation(
LPCTSTR lpRootPathName, // root directory
LPTSTR lpVolumeNameBuffer, // volume name buffer
DWORD nVolumeNameSize, // length of name buffer
LPDWORD lpVolumeSerialNumber, // volume serial number
LPDWORD lpMaximumComponentLength, // maximum file name length
LPDWORD lpFileSystemFlags, // file system options
LPTSTR lpFileSystemNameBuffer, // file system name buffer
DWORD nFileSystemNameSize // length of file system name buffer
);
