RawDiskNative.cs

using System;
using System.Runtime.InteropServices;

public static class RawDiskNative
{
    [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    public static extern IntPtr CreateFile(
        string lpFileName,
        uint dwDesiredAccess,
        uint dwShareMode,
        IntPtr lpSecurityAttributes,
        uint dwCreationDisposition,
        uint dwFlagsAndAttributes,
        IntPtr hTemplateFile);

    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern bool DeviceIoControl(
        IntPtr hDevice,
        uint dwIoControlCode,
        IntPtr lpInBuffer,
        uint nInBufferSize,
        IntPtr lpOutBuffer,
        uint nOutBufferSize,
        out uint lpBytesReturned,
        IntPtr lpOverlapped);

    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern bool CloseHandle(IntPtr hObject);

    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern bool SetFilePointerEx(
        IntPtr hFile,
        long liDistanceToMove,
        out long lpNewFilePointer,
        uint dwMoveMethod);

    [DllImport("kernel32.dll", SetLastError = true)]
    public static extern bool ReadFile(
        IntPtr hFile,
        byte[] lpBuffer,
        uint nNumberOfBytesToRead,
        out uint lpNumberOfBytesRead,
        IntPtr lpOverlapped);

    [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
    public static extern bool GetDiskFreeSpace(
        string lpRootPathName,
        out uint lpSectorsPerCluster,
        out uint lpBytesPerSector,
        out uint lpNumberOfFreeClusters,
        out uint lpTotalNumberOfClusters);

    public const uint GENERIC_READ = 0x80000000;
    public const uint FILE_SHARE_READ = 0x1;
    public const uint FILE_SHARE_WRITE = 0x2;
    public const uint FILE_SHARE_DELETE = 0x4;
    public const uint OPEN_EXISTING = 3;
    public const uint FILE_ATTRIBUTE_NORMAL = 0x80;
    public const uint FSCTL_GET_RETRIEVAL_POINTERS = 0x00090073;
    public static readonly IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1);
}