diff --git a/src/LibHac/IO/NxFileStream.cs b/src/LibHac/IO/NxFileStream.cs
index c0e10a2c..9e6406a8 100644
--- a/src/LibHac/IO/NxFileStream.cs
+++ b/src/LibHac/IO/NxFileStream.cs
@@ -7,12 +7,13 @@ namespace LibHac.IO
     {
         private IFile BaseFile { get; }
         private bool LeaveOpen { get; }
+        private long _length;
 
         public NxFileStream(IFile baseFile, bool leaveOpen)
         {
             BaseFile = baseFile;
             LeaveOpen = leaveOpen;
-            Length = baseFile.GetSize();
+            _length = baseFile.GetSize();
         }
 
         public override int Read(byte[] buffer, int offset, int count)
@@ -56,14 +57,15 @@ namespace LibHac.IO
 
         public override void SetLength(long value)
         {
-            throw new NotImplementedException();
+            BaseFile.SetSize(value);
+
+            _length = BaseFile.GetSize();
         }
 
-        // todo access
         public override bool CanRead => BaseFile.Mode.HasFlag(OpenMode.Read);
         public override bool CanSeek => true;
         public override bool CanWrite => BaseFile.Mode.HasFlag(OpenMode.Write);
-        public override long Length { get; }
+        public override long Length => _length;
         public override long Position { get; set; }
 
         protected override void Dispose(bool disposing)
diff --git a/src/LibHac/IO/RomFs/RomFsFileSystem.cs b/src/LibHac/IO/RomFs/RomFsFileSystem.cs
index 57f76a9e..4584db58 100644
--- a/src/LibHac/IO/RomFs/RomFsFileSystem.cs
+++ b/src/LibHac/IO/RomFs/RomFsFileSystem.cs
@@ -10,7 +10,6 @@ namespace LibHac.IO.RomFs
         public HierarchicalRomFileTable FileTable { get; }
         private IStorage BaseStorage { get; }
 
-        // todo Don't parse entire table when opening
         public RomFsFileSystem(IStorage storage)
         {
             BaseStorage = storage;
diff --git a/src/LibHac/IO/StorageFile.cs b/src/LibHac/IO/StorageFile.cs
index ee11f2f3..af325a31 100644
--- a/src/LibHac/IO/StorageFile.cs
+++ b/src/LibHac/IO/StorageFile.cs
@@ -40,7 +40,7 @@ namespace LibHac.IO
 
         public override void SetSize(long size)
         {
-            throw new NotImplementedException();
+            BaseStorage.SetSize(size);
         }
     }
 }
diff --git a/src/LibHac/IO/StorageStream.cs b/src/LibHac/IO/StorageStream.cs
index 293e1997..da0bfdd2 100644
--- a/src/LibHac/IO/StorageStream.cs
+++ b/src/LibHac/IO/StorageStream.cs
@@ -7,12 +7,13 @@ namespace LibHac.IO
     {
         private IStorage BaseStorage { get; }
         private bool LeaveOpen { get; }
+        private long _length;
 
         public StorageStream(IStorage baseStorage, FileAccess access, bool leaveOpen)
         {
             BaseStorage = baseStorage;
             LeaveOpen = leaveOpen;
-            Length = baseStorage.GetSize();
+            _length = baseStorage.GetSize();
 
             CanRead = access.HasFlag(FileAccess.Read);
             CanWrite = access.HasFlag(FileAccess.Write);
@@ -20,7 +21,7 @@ namespace LibHac.IO
 
         public override int Read(byte[] buffer, int offset, int count)
         {
-            int toRead = (int) Math.Min(count, Length - Position);
+            int toRead = (int)Math.Min(count, Length - Position);
             BaseStorage.Read(buffer.AsSpan(offset, toRead), Position);
 
             Position += toRead;
@@ -58,13 +59,15 @@ namespace LibHac.IO
 
         public override void SetLength(long value)
         {
-            throw new NotImplementedException();
+            BaseStorage.SetSize(value);
+
+            _length = BaseStorage.GetSize();
         }
 
         public override bool CanRead { get; }
         public override bool CanSeek => true;
         public override bool CanWrite { get; }
-        public override long Length { get; }
+        public override long Length => _length;
         public override long Position { get; set; }
 
         protected override void Dispose(bool disposing)