Как узнать емкость диска

void GetVolumeInfo (char* Volume)
 {
 char Name [256];
 char FileSysName [256];
 DWORD SerialNumber;
 DWORD MaxLength;
 DWORD FileSysFlags;
 DWORD SectorsPerCluster;
 DWORD BytesPerSector;
 DWORD NumberOfFreeClusters;
 DWORD TotalNumberOfClusters;
 
 if (GetVolumeInformation (
 Volume,
 Name,
 256,
 &SerialNumber,
 &MaxLength,
 &FileSysFlags,
 FileSysName,
 256))
 {
 GetDiskFreeSpace (
 Volume,
 &SectorsPerCluster,
 &BytesPerSector,
 &NumberOfFreeClusters,
 &TotalNumberOfClusters);
 
 sprintf (parserdata,"## VOLUME %s INFO<br> Name : %s<br> Serial number :
 %i<br> File system : %s<br> Total number of clusters :
 %i<br>",Volume,Name,SerialNumber,FileSysName,TotalNumberOfClusters);
 }
 else
 sprintf (parserdata,"## WRONG VOLUME NAME !<br>");
 }