diff --git a/source/Cosmos.System2/FileSystem/CosmosVFS.cs b/source/Cosmos.System2/FileSystem/CosmosVFS.cs
index 534c493f5..1d062af11 100644
--- a/source/Cosmos.System2/FileSystem/CosmosVFS.cs
+++ b/source/Cosmos.System2/FileSystem/CosmosVFS.cs
@@ -355,10 +355,11 @@ namespace Cosmos.System.FileSystem
             for (int i = 0; i < mPartitions.Count; i++)
             {
                 string xRootPath = string.Concat(i, VolumeSeparatorChar, DirectorySeparatorChar);
+                var xSize = (long)(mPartitions[i].BlockCount * mPartitions[i].BlockSize / 1024 / 1024);
                 switch (FileSystem.GetFileSystemType(mPartitions[i]))
                 {
                     case FileSystemType.FAT:
-                        mFileSystems.Add(new FatFileSystem(mPartitions[i], xRootPath));
+                        mFileSystems.Add(new FatFileSystem(mPartitions[i], xRootPath, xSize));
                         break;
                     default:
                         global::System.Console.WriteLine("Unknown filesystem type!");
diff --git a/source/Cosmos.System2/FileSystem/FAT/FatFileSystem.cs b/source/Cosmos.System2/FileSystem/FAT/FatFileSystem.cs
index 44929705c..21c513a8f 100644
--- a/source/Cosmos.System2/FileSystem/FAT/FatFileSystem.cs
+++ b/source/Cosmos.System2/FileSystem/FAT/FatFileSystem.cs
@@ -359,8 +359,8 @@ namespace Cosmos.System.FileSystem.FAT
         /// <param name="aDevice">The partition.</param>
         /// <param name="aRootPath">The root path.</param>
         /// <exception cref="Exception">FAT signature not found.</exception>
-        public FatFileSystem(Partition aDevice, string aRootPath)
-            : base(aDevice, aRootPath)
+        public FatFileSystem(Partition aDevice, string aRootPath, long aSize)
+            : base(aDevice, aRootPath, aSize)
         {
             if (aDevice == null)
             {
@@ -603,7 +603,7 @@ namespace Cosmos.System.FileSystem.FAT
         {
             Global.mFileSystemDebugger.SendInternal("-- FatFileSystem.GetRootDirectory --");
 
-            var xRootEntry = new FatDirectoryEntry(this, null, mRootPath, mRootPath, RootCluster);
+            var xRootEntry = new FatDirectoryEntry(this, null, mRootPath, mSize, mRootPath, RootCluster);
             return xRootEntry;
         }
 
diff --git a/source/Cosmos.System2/FileSystem/FAT/Listing/FatDiretoryEntry.cs b/source/Cosmos.System2/FileSystem/FAT/Listing/FatDiretoryEntry.cs
index c36b8356c..66633ac09 100644
--- a/source/Cosmos.System2/FileSystem/FAT/Listing/FatDiretoryEntry.cs
+++ b/source/Cosmos.System2/FileSystem/FAT/Listing/FatDiretoryEntry.cs
@@ -42,9 +42,10 @@ namespace Cosmos.System.FileSystem.FAT.Listing
             FatFileSystem aFileSystem,
             FatDirectoryEntry aParent,
             string aFullPath,
+            long aSize,
             string aName,
             uint aFirstCluster)
-            : base(aFileSystem, aParent, aFullPath, aName, 0, DirectoryEntryTypeEnum.Directory)
+            : base(aFileSystem, aParent, aFullPath, aName, aSize, DirectoryEntryTypeEnum.Directory)
         {
             if (aFirstCluster < aFileSystem.RootCluster)
             {
diff --git a/source/Cosmos.System2/FileSystem/FileSystem.cs b/source/Cosmos.System2/FileSystem/FileSystem.cs
index 03a92ddac..5486127f2 100644
--- a/source/Cosmos.System2/FileSystem/FileSystem.cs
+++ b/source/Cosmos.System2/FileSystem/FileSystem.cs
@@ -9,10 +9,11 @@ namespace Cosmos.System.FileSystem
 {
     public abstract class FileSystem
     {
-        protected FileSystem(Partition aDevice, string aRootPath)
+        protected FileSystem(Partition aDevice, string aRootPath, long aSize)
         {
             mDevice = aDevice;
             mRootPath = aRootPath;
+            mSize = aSize;
         }
 
         public static FileSystemType GetFileSystemType(Partition aDevice)
@@ -42,5 +43,7 @@ namespace Cosmos.System.FileSystem
         protected Partition mDevice { get; }
 
         public string mRootPath { get; }
+
+        public long mSize { get; }
     }
 }