diff --git a/cpp/devices/scsihd.cpp b/cpp/devices/scsihd.cpp
index ed3bc153..51384c6a 100644
--- a/cpp/devices/scsihd.cpp
+++ b/cpp/devices/scsihd.cpp
@@ -97,32 +97,8 @@ void SCSIHD::AddFormatPage(map<int, vector<byte>>& pages, bool changeable) const
 	EnrichFormatPage(pages, changeable, 1 << GetSectorSizeShiftCount());
 }
 
-// Page code 37 (25h) - DEC Special Function Control page
-
-void SCSIHD::AddDECSpecialFunctionControlPage(map<int, vector<byte>>& pages, bool changeable) const
-{
-	vector<byte> buf(25);
-
-	// No changeable area
-	if (changeable) {
-		pages[0x25] = buf;
-
-		return;
-	}
-
-	buf[0] = static_cast<byte> (0x25 | 0x80); // page code, high bit set
-	buf[1] = static_cast<byte> (sizeof(buf) - 1);
-	buf[2] = static_cast<byte> (0x01); // drive does not auto-start
-
-	pages[0x25] = buf;
-}
-
 void SCSIHD::AddVendorPage(map<int, vector<byte>>& pages, int page, bool changeable) const
 {
-	// Page code 0x25: DEC Special Function Control page
-	if (page == 0x25 || page == 0x3f) {
-		AddDECSpecialFunctionControlPage(pages, changeable);
-	}
 	// Page code 48
 	if (page == 0x30 || page == 0x3f) {
 		AddAppleVendorModePage(pages, changeable);
diff --git a/cpp/devices/scsihd.h b/cpp/devices/scsihd.h
index cd00191a..95ded11a 100644
--- a/cpp/devices/scsihd.h
+++ b/cpp/devices/scsihd.h
@@ -40,7 +40,6 @@ public:
 	void ModeSelect(scsi_defs::scsi_command, cdb_t, span<const uint8_t>, int) override;
 
 	void AddFormatPage(map<int, vector<byte>>&, bool) const override;
-	void AddDECSpecialFunctionControlPage(map<int, vector<byte>>&, bool) const;
 	void AddVendorPage(map<int, vector<byte>>&, int, bool) const override;
 
 private:
diff --git a/cpp/test/mocks.h b/cpp/test/mocks.h
index dd3c8268..919afd8d 100644
--- a/cpp/test/mocks.h
+++ b/cpp/test/mocks.h
@@ -360,7 +360,6 @@ class MockSCSIHD : public SCSIHD //NOSONAR Ignore inheritance hierarchy depth in
 	FRIEND_TEST(ScsiHdTest, FinalizeSetup);
 	FRIEND_TEST(ScsiHdTest, GetProductData);
 	FRIEND_TEST(ScsiHdTest, SetUpModePages);
-	FRIEND_TEST(ScsiHdTest, DECSpecialFunctionControlPage);
 	FRIEND_TEST(ScsiHdTest, GetSectorSizes);
 	FRIEND_TEST(ScsiHdTest, ModeSelect);
 	FRIEND_TEST(PiscsiExecutorTest, SetSectorSize);
diff --git a/cpp/test/scsihd_nec_test.cpp b/cpp/test/scsihd_nec_test.cpp
index bbcfed39..6b5cbd7c 100644
--- a/cpp/test/scsihd_nec_test.cpp
+++ b/cpp/test/scsihd_nec_test.cpp
@@ -18,12 +18,11 @@ using namespace filesystem;
 
 void ScsiHdNecTest_SetUpModePages(map<int, vector<byte>>& pages)
 {
-	EXPECT_EQ(6, pages.size()) << "Unexpected number of mode pages";
+	EXPECT_EQ(5, pages.size()) << "Unexpected number of mode pages";
 	EXPECT_EQ(12, pages[1].size());
 	EXPECT_EQ(24, pages[3].size());
 	EXPECT_EQ(20, pages[4].size());
 	EXPECT_EQ(12, pages[8].size());
-	EXPECT_EQ(25, pages[37].size());
 	EXPECT_EQ(30, pages[48].size());
 }
 
diff --git a/cpp/test/scsihd_test.cpp b/cpp/test/scsihd_test.cpp
index 81efae30..693f450b 100644
--- a/cpp/test/scsihd_test.cpp
+++ b/cpp/test/scsihd_test.cpp
@@ -13,12 +13,11 @@
 
 void ScsiHdTest_SetUpModePages(map<int, vector<byte>>& pages)
 {
-	EXPECT_EQ(6, pages.size()) << "Unexpected number of mode pages";
+	EXPECT_EQ(5, pages.size()) << "Unexpected number of mode pages";
 	EXPECT_EQ(12, pages[1].size());
 	EXPECT_EQ(24, pages[3].size());
 	EXPECT_EQ(24, pages[4].size());
 	EXPECT_EQ(12, pages[8].size());
-	EXPECT_EQ(25, pages[37].size());
 	EXPECT_EQ(30, pages[48].size());
 }
 
@@ -102,20 +101,6 @@ TEST(ScsiHdTest, SetUpModePages)
 	ScsiHdTest_SetUpModePages(pages);
 }
 
-TEST(ScsiHdTest, DECSpecialFunctionControlPage)
-{
-	map<int, vector<byte>> pages;
-	vector<byte> buf;
-	MockSCSIHD hd(0, false);
-
-	EXPECT_NO_THROW(hd.SetUpModePages(pages, 0x25, false)) << "MODE SENSE(6) DEC unique page is supported";
-	EXPECT_NE(pages.end(), pages.find(0x25));
-	buf = pages[0x25];
-	EXPECT_EQ(static_cast<byte> (0x25 | 0x80), buf[0]);
-	EXPECT_EQ(static_cast<byte> (0x17), buf[1]);
-	EXPECT_EQ(static_cast<byte> (0x01), buf[2]);
-}
-
 TEST(ScsiHdTest, ModeSelect)
 {
 	MockSCSIHD hd({ 512 });