diff --git a/hactoolnet/Program.cs b/hactoolnet/Program.cs
index 02166d93..93376717 100644
--- a/hactoolnet/Program.cs
+++ b/hactoolnet/Program.cs
@@ -1,4 +1,5 @@
-using System.IO;
+using System;
+using System.IO;
 using libhac;
 
 namespace hactoolnet
@@ -6,6 +7,11 @@ namespace hactoolnet
     public static class Program
     {
         static void Main(string[] args)
+        {
+            ListSdContents(args);
+        }
+
+        static void DecryptNax0(string[] args)
         {
             var keyset = ExternalKeys.ReadKeyFile(args[0]);
             keyset.SetSdSeed(args[1].ToBytes());
@@ -21,5 +27,18 @@ namespace hactoolnet
                 nax0.Stream.CopyStream(output, nax0.Stream.Length, progress);
             }
         }
+
+        static void ListSdContents(string[] args)
+        {
+            var keyset = ExternalKeys.ReadKeyFile(args[0]);
+            keyset.SetSdSeed(args[1].ToBytes());
+            var sdfs = new SdFs(keyset, args[2]);
+            var ncas = sdfs.ReadAllNca();
+
+            foreach (var nca in ncas)
+            {
+                Console.WriteLine($"{nca.TitleId:X8} {nca.ContentType} {nca.Name}");
+            }
+        }
     }
 }
diff --git a/libhac/Nca.cs b/libhac/Nca.cs
index aa5a0f72..b6df9b50 100644
--- a/libhac/Nca.cs
+++ b/libhac/Nca.cs
@@ -17,6 +17,7 @@ namespace libhac
         public uint SdkVersion { get; set; } // What SDK was this built with?
         public byte CryptoType2 { get; set; } // Which keyblob (field 2)
         public byte[] RightsId { get; set; }
+        public string Name { get; set; }
 
         public Nca(Keyset keyset, Stream stream)
         {
diff --git a/libhac/SdFs.cs b/libhac/SdFs.cs
new file mode 100644
index 00000000..50f6a16f
--- /dev/null
+++ b/libhac/SdFs.cs
@@ -0,0 +1,41 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
+namespace libhac
+{
+    public class SdFs
+    {
+        public Keyset Keyset { get; }
+        public string RootDir { get; }
+        public string ContentsDir { get; }
+        public string[] Files { get; }
+
+        public SdFs(Keyset keyset, string sdPath)
+        {
+            if (Directory.Exists(Path.Combine(sdPath, "Nintendo")))
+            {
+                RootDir = sdPath;
+                Keyset = keyset;
+                ContentsDir = Path.Combine(sdPath, "Nintendo", "Contents");
+            }
+
+            Files = Directory.GetFiles(ContentsDir, "00", SearchOption.AllDirectories).Select(Path.GetDirectoryName).ToArray();
+        }
+
+        public List<Nca> ReadAllNca()
+        {
+            List<Nca> ncas = new List<Nca>();
+            foreach (var file in Files)
+            {
+                var sdPath = "/" + Util.GetRelativePath(file, ContentsDir).Replace('\\', '/');
+                var nax0 = new Nax0(Keyset, file, sdPath);
+                var nca = new Nca(Keyset, nax0.Stream);
+                ncas.Add(nca);
+                nca.Name = Path.GetFileName(file);
+            }
+
+            return ncas;
+        }
+    }
+}
diff --git a/libhac/Util.cs b/libhac/Util.cs
index e566c856..74012cf1 100644
--- a/libhac/Util.cs
+++ b/libhac/Util.cs
@@ -79,6 +79,22 @@ namespace libhac
             return Encoding.ASCII.GetString(reader.ReadBytes(size), 0, size);
         }
 
+        // todo Maybe make less naive
+        public static string GetRelativePath(string path, string basePath)
+        {
+            var directory = new DirectoryInfo(basePath);
+            var file = new FileInfo(path);
+
+            string fullDirectory = directory.FullName;
+            string fullFile = file.FullName;
+
+            if (!fullFile.StartsWith(fullDirectory))
+            {
+                throw new ArgumentException($"{nameof(path)} is not a subpath of {nameof(basePath)}");
+            }
+
+            return fullFile.Substring(fullDirectory.Length + 1);
+        }
 
         private static int HexToInt(char c)
         {
diff --git a/libhac/XTSSharp/RandomAccessSectorStream.cs b/libhac/XTSSharp/RandomAccessSectorStream.cs
index 7ce5ff86..d81d3b16 100644
--- a/libhac/XTSSharp/RandomAccessSectorStream.cs
+++ b/libhac/XTSSharp/RandomAccessSectorStream.cs
@@ -41,6 +41,7 @@ namespace libhac.XTSSharp
         private bool _bufferDirty;
         private bool _bufferLoaded;
         private int _bufferPos;
+        private int _currentBufferSize;
 
         /// <summary>
         /// Creates a new stream
@@ -106,7 +107,7 @@ namespace libhac.XTSSharp
         /// <returns>The current position within the stream.</returns>
         public override long Position
         {
-            get { return _bufferLoaded ? (_s.Position - _bufferSize + _bufferPos) : _s.Position + _bufferPos; }
+            get { return _bufferLoaded ? (_s.Position - _currentBufferSize + _bufferPos) : _s.Position + _bufferPos; }
             set
             {
                 if (value < 0L)
@@ -299,6 +300,7 @@ namespace libhac.XTSSharp
             _bufferLoaded = true;
             _bufferPos = 0;
             _bufferDirty = false;
+            _currentBufferSize = bytesRead;
         }
 
         /// <summary>