///  
/// 獲取指定驅動器的空間總大小(單位為B)
///  
///  只需輸入代表驅動器的字母即可 （大寫）
///   
public static long GetHardDiskSpace(string str_HardDiskName)
{
    long totalSize= new long();
    str_HardDiskName=str_HardDiskName +"://";
    System.IO.DriveInfo[] drives = System.IO.DriveInfo.GetDrives();
    foreach (System.IO.DriveInfo drive in drives)
    {
 if (drive.Name == str_HardDiskName)
 {
     totalSize = drive.TotalSize / (1024 * 1024 * 1024);
 }
    }
    return totalSize;
}

///  
/// 獲取指定驅動器的剩余空間總大小(單位為B)
///  
///  只需輸入代表驅動器的字母即可 
///   
public static long GetHardDiskFreeSpace(string str_HardDiskName)
{
    long freeSpace = new long();
    str_HardDiskName = str_HardDiskName + "://";
    System.IO.DriveInfo[] drives = System.IO.DriveInfo.GetDrives();
    foreach (System.IO.DriveInfo drive in drives)
    {
 if (drive.Name == str_HardDiskName)
 {
     freeSpace = drive.TotalFreeSpace / (1024 * 1024 * 1024);
 }
    }
    return freeSpace;
}

List<Dictionary<string, string>> diskInfoDic = new List<Dictionary<string, string>>();
ManagementClass diskClass = new ManagementClass("Win32_LogicalDisk");
ManagementObjectCollection disks = diskClass.GetInstances();
foreach(ManagementObject disk in disks)
{
 Dictionary<string, string> diskInfo = new Dictionary<string, string>();
 try
 {
     // 磁盤名稱
     diskInfo["Name"] =disk["Name"].ToString();
     // 磁盤描述
     diskInfo["Description"]=disk["Description"].ToString();
     // 磁盤總容量，可用空間，已用空間
     if (System.Convert.ToInt64(disk["Size"]) > 0)
     {
  long totalSpace = System.Convert.ToInt64(disk["Size"]) / MB;
  long freeSpace = System.Convert.ToInt64(disk["FreeSpace"]) / MB;
  long usedSpace = totalSpace - freeSpace;
       diskInfo["totalSpace"]=totalSpace.ToString();
  diskInfo["usedSpace"]=usedSpace.ToString();
  diskInfo["freeSpace"]=freeSpace.ToString();
     }
     diskInfoDic.Add(diskInfo);
 }
 catch(Exception ex)
 {
     Throw ex;
 }
}