如何用C#.Net实现Linux dd命令的磁盘镜像写入功能？

我正在尝试用C#/.Net实现Linux dd命令的核心功能：

dd if=/dev/sdX of=disk_image_file
dd if=disk_image_file of=/dev/sdX

目前已实现从设备创建磁盘镜像，但将镜像写回SD卡时，抛出System.UnauthorizedAccessException: 路径访问被拒绝错误。

复现代码 #

class Program
{
    [DllImport( "Kernel32.dll", SetLastError = true, CharSet = CharSet.Auto )]
    public static extern SafeFileHandle CreateFile( string fileName, [MarshalAs( UnmanagedType.U4 )] FileAccess fileAccess, [MarshalAs( UnmanagedType.U4 )] FileShare fileShare, IntPtr securityAttributes, [MarshalAs( UnmanagedType.U4 )] FileMode creationDisposition, int flags, IntPtr template );

    static void Main( string[] args )
    {
        if( !IsAdministrator() )
        {
            Console.Error.WriteLine( "Not an administrator" );
            return;
        }

        var imageFile = Path.GetTempFileName();
        Console.WriteLine( $"Image File: {imageFile}" );

        try
        {
            var deviceId = GetUsbDevice();
            Console.WriteLine( $"Device ID: {deviceId}" );

            CreateDiskImage( deviceId, imageFile );
            CreateDiskFromImage( deviceId, imageFile );
        }
        catch( Exception exception )
        {
            Console.WriteLine( $"ERROR: {exception}" );
        }
        finally
        {
            File.Delete( imageFile );
        }
    }

    private static string GetUsbDevice()
    {
        var searcher = new ManagementObjectSearcher( "SELECT DeviceID, MediaType FROM Win32_DiskDrive WHERE MediaType='Removable Media' AND InterfaceType='USB'" );

        var drive = searcher.Get().Cast<ManagementObject>().FirstOrDefault();

        return drive?[ "DeviceID" ].ToString();
    }

    private static void CreateDiskImage( string deviceId, string imageFile )
    {
        using( SafeFileHandle device = CreateFile( deviceId, FileAccess.Read, FileShare.Write | FileShare.Read | FileShare.Delete, IntPtr.Zero, FileMode.Open, (int) FileAttributes.System | (int) FileOptions.SequentialScan, IntPtr.Zero ) )
        {
            using( FileStream dest = File.Open( imageFile, FileMode.Create ) )
            {
                using( FileStream src = new FileStream( device, FileAccess.Read ) )
                {
                    CopyTo( src, dest, 1048576 ); //read first 1MB for simplifying
                }
            }
        }
    }

    private static void CreateDiskFromImage( string deviceId, string imageFile )
    {
        using( SafeFileHandle device = CreateFile( deviceId, FileAccess.ReadWrite, FileShare.Write | FileShare.Read, IntPtr.Zero, FileMode.Open, (int) FileAttributes.System, IntPtr.Zero ) )
        {
            using( FileStream src = File.Open( imageFile, FileMode.Open ) )
            {
                using( FileStream dest = new FileStream( device, FileAccess.Write ) )
                {
                    src.CopyTo( dest );
                }
            }
        }
    }

    public static long CopyTo( Stream input, Stream output, long length )
    {
        byte[] buffer = new byte[ 1048576 ];
        int read;
        long totalRead = 0;

        while( totalRead < length && (read = input.Read( buffer, 0, buffer.Length )) > 0 )
        {
            output.Write( buffer, 0, read );
            totalRead += read;
        }

        Console.WriteLine( $"Read first {length} bytes." );
        return totalRead;
    }

    private static bool IsAdministrator()
    {
        using( WindowsIdentity identity = WindowsIdentity.GetCurrent() )
        {
            WindowsPrincipal principal = new WindowsPrincipal( identity );
            return principal.IsInRole( WindowsBuiltInRole.Administrator );
        }
    }
}

我找不到代码中的问题，难道这个功能无法实现？求提示。

更新记录 #

• 更新1：查阅资料后得知，写入操作前需要卸载并锁定设备，将针对此方向展开调查。
• 更新2：已确认写入失败的原因是SD卡上的挂载分区占用了设备，删除分区后代码成功将镜像写入磁盘。

删除分区的方法 #

用diskpart命令：

select disk N  # N为磁盘编号
select part 1  # 选择第一个分区
delete part 

用PowerShell命令：

Remove-Partition -DiskNumber N -PartitionNumber 1 -Confirm:$false

内容的提问来源于stack exchange，提问作者igor.br