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diff --git a/src/VBox/Main/include/MediumIOImpl.h b/src/VBox/Main/include/MediumIOImpl.h
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+++ b/src/VBox/Main/include/MediumIOImpl.h
@@ -0,0 +1,92 @@
+/* $Id: MediumIOImpl.h $ */
+/** @file
+ * VirtualBox COM class implementation - MediumIO.
+ */
+
+/*
+ * Copyright (C) 2018-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#ifndef MAIN_INCLUDED_MediumIOImpl_h
+#define MAIN_INCLUDED_MediumIOImpl_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include "MediumIOWrap.h"
+#include "VirtualBoxBase.h"
+#include "AutoCaller.h"
+
+class ATL_NO_VTABLE MediumIO :
+    public MediumIOWrap
+{
+public:
+    /** @name Dummy/standard constructors and destructors.
+     * @{ */
+    DECLARE_COMMON_CLASS_METHODS(MediumIO)
+    HRESULT FinalConstruct();
+    void    FinalRelease();
+    /** @} */
+
+    /** @name Initializer & uninitializer.
+     * @{ */
+    HRESULT initForMedium(Medium *pMedium, VirtualBox *pVirtualBox, bool fWritable,
+                          com::Utf8Str const &rStrKeyId, com::Utf8Str const &rStrPassword);
+    void    uninit();
+    /** @} */
+
+private:
+    /** @name Wrapped IMediumIO properties
+     * @{ */
+    HRESULT getMedium(ComPtr<IMedium> &a_rPtrMedium);
+    HRESULT getWritable(BOOL *a_fWritable);
+    HRESULT getExplorer(ComPtr<IVFSExplorer> &a_rPtrExplorer);
+    /** @} */
+
+    /** @name Wrapped IMediumIO methods
+     * @{ */
+    HRESULT read(LONG64 a_off, ULONG a_cbRead, std::vector<BYTE> &a_rData);
+    HRESULT write(LONG64 a_off, const std::vector<BYTE> &a_rData, ULONG *a_pcbWritten);
+    HRESULT formatFAT(BOOL a_fQuick);
+    HRESULT initializePartitionTable(PartitionTableType_T a_enmFormat, BOOL a_fWholeDiskInOneEntry);
+    HRESULT convertToStream(const com::Utf8Str &aFormat,
+                            const std::vector<MediumVariant_T> &aVariant,
+                            ULONG aBufferSize,
+                            ComPtr<IDataStream> &aStream,
+                            ComPtr<IProgress> &aProgress);
+    HRESULT close();
+    /** @} */
+
+    /** @name Internal workers.
+     *  @{ */
+    void    i_close();
+    /** @} */
+
+    struct Data;
+    Data *m;
+
+    class StreamTask;
+    friend class StreamTask;
+};
+
+#endif /* !MAIN_INCLUDED_MediumIOImpl_h */
+/* vi: set tabstop=4 shiftwidth=4 expandtab: */
+