diff --git a/src/LibHac/Fs/Shim/Mmc.cs b/src/LibHac/Fs/Shim/Mmc.cs
new file mode 100644
index 00000000..b3ff1a6f
--- /dev/null
+++ b/src/LibHac/Fs/Shim/Mmc.cs
@@ -0,0 +1,171 @@
+using System;
+using LibHac.Common;
+using LibHac.FsSrv.Sf;
+using LibHac.Sf;
+
+namespace LibHac.Fs.Shim;
+
+/// <summary>
+/// Contains functions used for interacting with the MMC.
+/// </summary>
+/// <remarks>Based on nnSdk 14.3.0</remarks>
+public static class Mmc
+{
+    public static Result GetMmcSpeedMode(this FileSystemClient fs, out MmcSpeedMode outSpeedMode)
+    {
+        UnsafeHelpers.SkipParamInit(out outSpeedMode);
+
+        using SharedRef<IFileSystemProxy> fileSystemProxy = fs.Impl.GetFileSystemProxyServiceObject();
+        using var deviceOperator = new SharedRef<IDeviceOperator>();
+
+        Result rc = fileSystemProxy.Get.OpenDeviceOperator(ref deviceOperator.Ref());
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        rc = deviceOperator.Get.GetMmcSpeedMode(out long speedMode);
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        outSpeedMode = (MmcSpeedMode)speedMode;
+        return Result.Success;
+    }
+
+    public static Result GetMmcCid(this FileSystemClient fs, Span<byte> outCidBuffer)
+    {
+        using SharedRef<IFileSystemProxy> fileSystemProxy = fs.Impl.GetFileSystemProxyServiceObject();
+        using var deviceOperator = new SharedRef<IDeviceOperator>();
+
+        Result rc = fileSystemProxy.Get.OpenDeviceOperator(ref deviceOperator.Ref());
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        rc = deviceOperator.Get.GetMmcCid(new OutBuffer(outCidBuffer), outCidBuffer.Length);
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        return Result.Success;
+    }
+
+    public static Result EraseMmc(this FileSystemClient fs, MmcPartition partition)
+    {
+        using SharedRef<IFileSystemProxy> fileSystemProxy = fs.Impl.GetFileSystemProxyServiceObject();
+        using var deviceOperator = new SharedRef<IDeviceOperator>();
+
+        Result rc = fileSystemProxy.Get.OpenDeviceOperator(ref deviceOperator.Ref());
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        rc = deviceOperator.Get.EraseMmc((uint)partition);
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        return Result.Success;
+    }
+
+    public static Result GetMmcPartitionSize(this FileSystemClient fs, out long outPartitionSize,
+        MmcPartition partition)
+    {
+        UnsafeHelpers.SkipParamInit(out outPartitionSize);
+
+        using SharedRef<IFileSystemProxy> fileSystemProxy = fs.Impl.GetFileSystemProxyServiceObject();
+        using var deviceOperator = new SharedRef<IDeviceOperator>();
+
+        Result rc = fileSystemProxy.Get.OpenDeviceOperator(ref deviceOperator.Ref());
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        rc = deviceOperator.Get.GetMmcPartitionSize(out outPartitionSize, (uint)partition);
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        return Result.Success;
+    }
+
+    public static Result GetMmcPatrolCount(this FileSystemClient fs, out uint outPatrolCount)
+    {
+        UnsafeHelpers.SkipParamInit(out outPatrolCount);
+
+        using SharedRef<IFileSystemProxy> fileSystemProxy = fs.Impl.GetFileSystemProxyServiceObject();
+        using var deviceOperator = new SharedRef<IDeviceOperator>();
+
+        Result rc = fileSystemProxy.Get.OpenDeviceOperator(ref deviceOperator.Ref());
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        rc = deviceOperator.Get.GetMmcPatrolCount(out outPatrolCount);
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        return Result.Success;
+    }
+
+    public static Result GetAndClearMmcErrorInfo(this FileSystemClient fs, out StorageErrorInfo outErrorInfo,
+        out long outLogSize, Span<byte> logBuffer)
+    {
+        UnsafeHelpers.SkipParamInit(out outErrorInfo, out outLogSize);
+
+        using SharedRef<IFileSystemProxy> fileSystemProxy = fs.Impl.GetFileSystemProxyServiceObject();
+        using var deviceOperator = new SharedRef<IDeviceOperator>();
+
+        Result rc = fileSystemProxy.Get.OpenDeviceOperator(ref deviceOperator.Ref());
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        rc = deviceOperator.Get.GetAndClearMmcErrorInfo(out outErrorInfo, out long logSize, new OutBuffer(logBuffer),
+            logBuffer.Length);
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        outLogSize = logSize;
+
+        return Result.Success;
+    }
+
+    public static Result GetMmcExtendedCsd(this FileSystemClient fs, Span<byte> outBuffer)
+    {
+        using SharedRef<IFileSystemProxy> fileSystemProxy = fs.Impl.GetFileSystemProxyServiceObject();
+        using var deviceOperator = new SharedRef<IDeviceOperator>();
+
+        Result rc = fileSystemProxy.Get.OpenDeviceOperator(ref deviceOperator.Ref());
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        rc = deviceOperator.Get.GetMmcExtendedCsd(new OutBuffer(outBuffer), outBuffer.Length);
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        return Result.Success;
+    }
+
+    public static Result SuspendMmcPatrol(this FileSystemClient fs)
+    {
+        using SharedRef<IFileSystemProxy> fileSystemProxy = fs.Impl.GetFileSystemProxyServiceObject();
+        using var deviceOperator = new SharedRef<IDeviceOperator>();
+
+        Result rc = fileSystemProxy.Get.OpenDeviceOperator(ref deviceOperator.Ref());
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        rc = deviceOperator.Get.SuspendMmcPatrol();
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        return Result.Success;
+    }
+
+    public static Result ResumeMmcPatrol(this FileSystemClient fs)
+    {
+        using SharedRef<IFileSystemProxy> fileSystemProxy = fs.Impl.GetFileSystemProxyServiceObject();
+        using var deviceOperator = new SharedRef<IDeviceOperator>();
+
+        Result rc = fileSystemProxy.Get.OpenDeviceOperator(ref deviceOperator.Ref());
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        rc = deviceOperator.Get.ResumeMmcPatrol();
+        fs.Impl.AbortIfNeeded(rc);
+        if (rc.IsFailure()) return rc.Miss();
+
+        return Result.Success;
+    }
+}
\ No newline at end of file