diff --git a/src/LibHac/Fat/FatAttribute.cs b/src/LibHac/Fat/FatAttribute.cs
new file mode 100644
index 00000000..4019b8f2
--- /dev/null
+++ b/src/LibHac/Fat/FatAttribute.cs
@@ -0,0 +1,9 @@
+namespace LibHac.Fat
+{
+    public struct FatAttribute
+    {
+        public bool IsFatSafeEnabled;
+        public bool IsFatFormatNormalized;
+        public bool IsTimeStampUpdated;
+    }
+}
diff --git a/src/LibHac/Fat/FatFormatParam.cs b/src/LibHac/Fat/FatFormatParam.cs
new file mode 100644
index 00000000..e6106fde
--- /dev/null
+++ b/src/LibHac/Fat/FatFormatParam.cs
@@ -0,0 +1,12 @@
+using System;
+
+namespace LibHac.Fat
+{
+    public struct FatFormatParam
+    {
+        public bool IsSdCard;
+        public uint ProtectedAreaSectors;
+        public Result WriteVerifyErrorResult;
+        public Memory<byte> WorkBuffer;
+    }
+}
diff --git a/src/LibHac/FsSrv/Creators/IFatFileSystemCreator.cs b/src/LibHac/FsSrv/Creators/IFatFileSystemCreator.cs
index 82d19238..6ecf6d38 100644
--- a/src/LibHac/FsSrv/Creators/IFatFileSystemCreator.cs
+++ b/src/LibHac/FsSrv/Creators/IFatFileSystemCreator.cs
@@ -1,10 +1,16 @@
-using LibHac.Fs;
+using LibHac.Fat;
+using LibHac.Fs;
 using LibHac.Fs.Fsa;
 
 namespace LibHac.FsSrv.Creators
 {
     public interface IFatFileSystemCreator
     {
-        Result Create(out IFileSystem fileSystem, IStorage baseStorage);
+        Result Create(out ReferenceCountedDisposable<IFileSystem> fileSystem,
+            ReferenceCountedDisposable<IStorage> baseStorage, FatAttribute attribute, int driveId,
+            Result invalidFatFormatResult, Result usableSpaceNotEnoughResult);
+
+        Result Format(ReferenceCountedDisposable<IStorage> partitionStorage, FatAttribute attribute,
+            FatFormatParam formatParam, int driveId, Result invalidFatFormatResult, Result usableSpaceNotEnoughResult);
     }
 }
\ No newline at end of file