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diff --git a/src/VBox/Main/include/MediumAttachmentImpl.h b/src/VBox/Main/include/MediumAttachmentImpl.h
new file mode 100644
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+++ b/src/VBox/Main/include/MediumAttachmentImpl.h
@@ -0,0 +1,146 @@
+/* $Id: MediumAttachmentImpl.h $ */
+/** @file
+ *
+ * VirtualBox COM class implementation
+ */
+
+/*
+ * Copyright (C) 2006-2023 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_MediumAttachmentImpl_h
+#define MAIN_INCLUDED_MediumAttachmentImpl_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include "MediumAttachmentWrap.h"
+
+class ATL_NO_VTABLE MediumAttachment :
+    public MediumAttachmentWrap
+{
+public:
+
+    DECLARE_COMMON_CLASS_METHODS(MediumAttachment)
+
+    HRESULT FinalConstruct();
+    void FinalRelease();
+
+    // public initializer/uninitializer for internal purposes only
+    HRESULT init(Machine *aParent,
+                 Medium *aMedium,
+                 const Utf8Str &aControllerName,
+                 LONG aPort,
+                 LONG aDevice,
+                 DeviceType_T aType,
+                 bool aImplicit,
+                 bool aPassthrough,
+                 bool aTempEject,
+                 bool aNonRotational,
+                 bool aDiscard,
+                 bool aHotPluggable,
+                 const Utf8Str &strBandwidthGroup);
+    HRESULT initCopy(Machine *aParent, MediumAttachment *aThat);
+    void uninit();
+
+    // public internal methods
+    void i_rollback();
+    void i_commit();
+
+    // unsafe public methods for internal purposes only (ensure there is
+    // a caller and a read lock before calling them!)
+    bool i_isImplicit() const;
+    void i_setImplicit(bool aImplicit);
+
+    const ComObjPtr<Medium>& i_getMedium() const;
+    const Utf8Str &i_getControllerName() const;
+    LONG i_getPort() const;
+    LONG i_getDevice() const;
+    DeviceType_T i_getType() const;
+    bool i_getPassthrough() const;
+    bool i_getTempEject() const;
+    bool i_getNonRotational() const;
+    bool i_getDiscard() const;
+    Utf8Str& i_getBandwidthGroup() const;
+    bool i_getHotPluggable() const;
+
+    bool i_matches(const Utf8Str &aControllerName, LONG aPort, LONG aDevice);
+
+    /** Must be called from under this object's write lock. */
+    void i_updateName(const Utf8Str &aName);
+
+    /** Must be called from under this object's write lock. */
+    void i_updateMedium(const ComObjPtr<Medium> &aMedium);
+
+    /** Must be called from under this object's write lock. */
+    void i_updatePassthrough(bool aPassthrough);
+
+    /** Must be called from under this object's write lock. */
+    void i_updateTempEject(bool aTempEject);
+
+    /** Must be called from under this object's write lock. */
+    void i_updateNonRotational(bool aNonRotational);
+
+    /** Must be called from under this object's write lock. */
+    void i_updateDiscard(bool aDiscard);
+
+    /** Must be called from under this object's write lock. */
+    void i_updateEjected();
+
+    /** Must be called from under this object's write lock. */
+    void i_updateBandwidthGroup(const Utf8Str &aBandwidthGroup);
+
+    void i_updateParentMachine(Machine * const pMachine);
+
+    /** Must be called from under this object's write lock. */
+    void i_updateHotPluggable(bool aHotPluggable);
+
+    /** Construct a unique and somewhat descriptive name for logging. */
+    void i_updateLogName(void);
+
+    /** Get a unique and somewhat descriptive name for logging. */
+    const char *i_getLogName(void) const { return mLogName.c_str(); }
+
+private:
+
+    // Wrapped IMediumAttachment properties
+    HRESULT getMachine(ComPtr<IMachine> &aMachine);
+    HRESULT getMedium(ComPtr<IMedium> &aHardDisk);
+    HRESULT getController(com::Utf8Str &aController);
+    HRESULT getPort(LONG *aPort);
+    HRESULT getDevice(LONG *aDevice);
+    HRESULT getType(DeviceType_T *aType);
+    HRESULT getPassthrough(BOOL *aPassthrough);
+    HRESULT getTemporaryEject(BOOL *aTemporaryEject);
+    HRESULT getIsEjected(BOOL *aEjected);
+    HRESULT getDiscard(BOOL *aDiscard);
+    HRESULT getNonRotational(BOOL *aNonRotational);
+    HRESULT getBandwidthGroup(ComPtr<IBandwidthGroup> &aBandwidthGroup);
+    HRESULT getHotPluggable(BOOL *aHotPluggable);
+
+    struct Data;
+    Data *m;
+
+    Utf8Str mLogName;                   /**< For logging purposes */
+};
+
+#endif /* !MAIN_INCLUDED_MediumAttachmentImpl_h */
+/* vi: set tabstop=4 shiftwidth=4 expandtab: */