First version

BadBlocksPlaceholder.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+  </PropertyGroup>
+
+</Project>

Program.cs

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+using System;
+using System.IO;
+
+namespace BadBlocksPlaceholder
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            var drive = new DriveInfo(args[0]);
+            int blockSize = int.Parse(args[1]) * 1024;
+            var block = new byte[blockSize];
+            var bbDir = Path.Combine(drive.RootDirectory.FullName, "BadBlockPlaceholders");
+            if (!Directory.Exists(bbDir))
+                Directory.CreateDirectory(bbDir);
+
+            var targetDir = Path.Combine(bbDir, DateTime.Now.ToString("yyyyMMdd"));
+            if (!Directory.Exists(targetDir))
+                Directory.CreateDirectory(targetDir);
+
+            int index = 0;
+            while (drive.AvailableFreeSpace > blockSize)
+            {
+                Console.WriteLine("Creating block #" + index);
+                var filename = Path.Combine(targetDir, index + ".bad");
+                ++index;
+                using (var filestream = File.OpenWrite(filename))
+                {
+                    filestream.Write(block, 0, blockSize);
+                    filestream.Flush();
+                    filestream.Close();
+                }
+            }
+
+            Console.WriteLine("Validating blocks");
+            foreach (var file in Directory.GetFiles(targetDir))
+            {
+                try
+                {
+                    var res = File.ReadAllBytes(file);
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine(ex.Message);
+                    continue;
+                }
+                File.Delete(file);
+            }
+            Console.WriteLine("Done!");
+        }
+    }
+}