硬盘序列号（Serial Number）不等于卷标号（Volume Name），后者虽然很容易得到，但是格式化分区后就会重写，不可靠。遗憾的是很多朋友往往分不清这一点。
要得到硬盘的物理序列号，可以通过WMI，也就是Win32_PhysicalMedia.SerialNumber。可惜的是Windows 98/ME的WMI并不支持这个类，访问时会出现异常。
受陆麟的例子的启发，我们还可以通过S.M.A.R.T.接口，直接从RING3调用API DeviceIoControl()来获取硬盘信息，而不需要写VXD或者DRIVER。这样这个问题就解决了，我对它进行了封装，大量使用了P/Invoke技术，一个完整的Library。支持Windows 98-2003。
使用上很简单：
HardDiskInfo hdd = AtapiDevice.GetHddInfo(0); // 第一个硬盘
Console.WriteLine("Module Number: {0}", hdd.ModuleNumber);
Console.WriteLine("Serial Number: {0}", hdd.SerialNumber);
Console.WriteLine("Firmware: {0}", hdd.Firmware);
Console.WriteLine("Capacity: {0} M", hdd.Capacity);
下面是全部代码：
using System;
using System.Runtime.InteropServices;
using System.Text;
namespace Sunmast.Hardware
{
[Serializable]
public struct HardDiskInfo
{
/// <summary>
/// 型号
/// </summary>
public string ModuleNumber;
/// <summary>
/// 固件版本
/// </summary>
public string Firmware;
/// <summary>
/// 序列号
/// </summary>
public string SerialNumber;
/// <summary>
/// 容量，以M为单位
/// </summary>
public uint Capacity;
}
#region Internal Structs
[StructLayout(LayoutKind.Sequential, Pack=1)]
internal struct GetVersionOutParams
{
public byte bVersion;
public byte bRevision;
public byte bReserved;
public byte bIDEDeviceMap;
public uint fCapabilities;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=4)]
public uint[] dwReserved; // For future use.
}
[StructLayout(LayoutKind.Sequential, Pack=1)]
internal struct IdeRegs
{
public byte bFeaturesReg;
public byte bSectorCountReg;
public byte bSectorNumberReg;
public byte bCylLowReg;
public byte bCylHighReg;
public byte bDriveHeadReg;
public byte bCommandReg;
public byte bReserved;
}
[StructLayout(LayoutKind.Sequential, Pack=1)]
internal struct SendCmdInParams
{
public uint cBufferSize;
public IdeRegs irDriveRegs;
public byte bDriveNumber;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=3)]
public byte[] bReserved;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=4)]
public uint[] dwReserved;
public byte bBuffer;
}
[StructLayout(LayoutKind.Sequential, Pack=1)]
internal struct DriverStatus
{
public byte bDriverError;
public byte bIDEStatus;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=2)]
public byte[] bReserved;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=2)]
public uint[] dwReserved;
}
[StructLayout(LayoutKind.Sequential, Pack=1)]
internal struct SendCmdOutParams
{
public uint cBufferSize;
public DriverStatus DriverStatus;
public IdSector bBuffer;
}
[StructLayout(LayoutKind.Sequential, Pack=1, Size=512)]
internal struct IdSector
{
public ushort wGenConfig;
public ushort wNumCyls;
public ushort wReserved;
public ushort wNumHeads;
public ushort wBytesPerTrack;
public ushort wBytesPerSector;
public ushort wSectorsPerTrack;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=3)]
public ushort[] wVendorUnique;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=20)]
public byte[] sSerialNumber;
public ushort wBufferType;
public ushort wBufferSize;
public ushort wECCSize;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=8)]
public byte[] sFirmwareRev;
[MarshalAs(UnmanagedType.ByValArray, SizeConst=40)]
public byte[] sModelNumber;
public ushort wMoreVendorUnique;
public ushort wDoubleWordIO;
public ushort wCapabilities;
public ushort wReserved1;
public ushort wPIOTiming;
public ushort wDMATiming;
public ushort wBS;
public ushort wNumCurrentCyls;
public ushort wNumCurrentHeads;
public ushort w
