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diff --git a/src/VBox/Storage/testcase/VDMemDisk.h b/src/VBox/Storage/testcase/VDMemDisk.h
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+/** @file
+ *
+ * VBox HDD container test utility, memory disk/file.
+ */
+
+/*
+ * Copyright (C) 2011-2022 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 VBOX_INCLUDED_SRC_testcase_VDMemDisk_h
+#define VBOX_INCLUDED_SRC_testcase_VDMemDisk_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/sg.h>
+
+/** Handle to the a memory disk. */
+typedef struct VDMEMDISK *PVDMEMDISK;
+/** Pointer to a memory disk handle. */
+typedef PVDMEMDISK *PPVDMEMDISK;
+
+/**
+ * Creates a new memory disk with the given size.
+ *
+ * @returns VBOX status code.
+ *
+ * @param ppMemDisk    Where to store the memory disk handle.
+ * @param cbSize       Size of the disk if it is fixed.
+ *                     If 0 the disk grows when it is written to
+ *                     and the size can be changed with
+ *                     VDMemDiskSetSize().
+ */
+int VDMemDiskCreate(PPVDMEMDISK ppMemDisk, uint64_t cbSize);
+
+/**
+ * Destroys a memory disk.
+ *
+ * @returns nothing.
+ *
+ * @param pMemDisk The memory disk to destroy.
+ */
+void VDMemDiskDestroy(PVDMEMDISK pMemDisk);
+
+/**
+ * Writes the specified amount of data from the S/G buffer at
+ * the given offset.
+ *
+ * @returns VBox status code.
+ *
+ * @param pMemDisk    The memory disk handle.
+ * @param off         Where to start writing to.
+ * @param cbWrite     How many bytes to write.
+ * @param pSgBuf      The S/G buffer to write from.
+ */
+int VDMemDiskWrite(PVDMEMDISK pMemDisk, uint64_t off, size_t cbWrite, PRTSGBUF pSgBuf);
+
+/**
+ * Reads the specified amount of data into the S/G buffer
+ * starting from the given offset.
+ *
+ * @returns VBox status code.
+ *
+ * @param pMemDisk    The memory disk handle.
+ * @param off         Where to start reading from.
+ * @param cbRead      The amount of bytes to read.
+ * @param pSgBuf      The S/G buffer to read into.
+ */
+int VDMemDiskRead(PVDMEMDISK pMemDisk, uint64_t off, size_t cbRead, PRTSGBUF pSgBuf);
+
+/**
+ * Sets the size of the memory disk.
+ *
+ * @returns VBox status code.
+ *
+ * @param pMemDisk    The memory disk handle.
+ * @param cbSize      The new size to set.
+ */
+int VDMemDiskSetSize(PVDMEMDISK pMemDisk, uint64_t cbSize);
+
+/**
+ * Gets the current size of the memory disk.
+ *
+ * @returns VBox status code.
+ *
+ * @param pMemDisk    The memory disk handle.
+ * @param pcbSize     Where to store the size of the memory
+ *                    disk.
+ */
+int VDMemDiskGetSize(PVDMEMDISK pMemDisk, uint64_t *pcbSize);
+
+/**
+ * Dumps the memory disk to a file.
+ *
+ * @returns VBox status code.
+ *
+ * @param pMemDisk     The memory disk handle.
+ * @param pcszFilename Where to dump the content.
+ */
+int VDMemDiskWriteToFile(PVDMEMDISK pMemDisk, const char *pcszFilename);
+
+/**
+ * Reads the content of a file into the given memory disk.
+ * All data stored in the memory disk will be overwritten.
+ *
+ * @returns VBox status code.
+ *
+ * @param pMemDisk     The memory disk handle.
+ * @param pcszFilename The file to load from.
+ */
+int VDMemDiskReadFromFile(PVDMEMDISK pMemDisk, const char *pcszFilename);
+
+/**
+ * Compares the given range of the memory disk with a provided S/G buffer.
+ *
+ * @returns whatever memcmp returns.
+ *
+ * @param   pMemDisk   The memory disk handle.
+ * @param   off        Where to start comparing.
+ * @param   cbCmp      How many bytes to compare.
+ * @param   pSgBuf     The S/G buffer to compare with.
+ */
+int VDMemDiskCmp(PVDMEMDISK pMemDisk, uint64_t off, size_t cbCmp, PRTSGBUF pSgBuf);
+
+#endif /* !VBOX_INCLUDED_SRC_testcase_VDMemDisk_h */