diff --git a/src/dos/cdrom.h b/src/dos/cdrom.h
index 1edcb6b5..e67c1251 100644
--- a/src/dos/cdrom.h
+++ b/src/dos/cdrom.h
@@ -20,12 +20,13 @@
 #ifndef __CDROM_INTERFACE__
 #define __CDROM_INTERFACE__
 
-#include <string.h>
-#include <string>
-#include <iostream>
-#include <vector>
+#include <cstring>
 #include <fstream>
+#include <iostream>
 #include <sstream>
+#include <string>
+#include <vector>
+
 #include <SDL.h>
 #include <SDL_thread.h>
 
@@ -120,6 +121,7 @@ private:
 	protected:
 		TrackFile(Bit16u _chunkSize) : chunkSize(_chunkSize) {}
 	public:
+		virtual         ~TrackFile() = default;
 		virtual bool    read(Bit8u *buffer, int seek, int count) = 0;
 		virtual bool    seek(Bit32u offset) = 0;
 		virtual Bit32u  decode(Bit16s *buffer, Bit32u desired_track_frames) = 0;
@@ -127,12 +129,18 @@ private:
 		virtual Bit32u  getRate() = 0;
 		virtual Bit8u   getChannels() = 0;
 		virtual int     getLength() = 0;
-		virtual         ~TrackFile() {}
 		const Bit16u    chunkSize;
 	};
+
 	class BinaryFile : public TrackFile {
 	public:
 		BinaryFile      (const char *filename, bool &error);
+		~BinaryFile     ();
+
+		BinaryFile      () = delete;
+		BinaryFile      (const BinaryFile&) = delete; // prevent copying
+		BinaryFile&     operator= (const BinaryFile&) = delete; // prevent assignment
+
 		bool            read(Bit8u *buffer, int seek, int count);
 		bool            seek(Bit32u offset);
 		Bit32u          decode(Bit16s *buffer, Bit32u desired_track_frames);
@@ -140,15 +148,19 @@ private:
 		Bit32u          getRate() { return 44100; }
 		Bit8u           getChannels() { return 2; }
 		int             getLength();
-		~BinaryFile();
 	private:
 		std::ifstream   *file;
-		BinaryFile();
 	};
 
 	class AudioFile : public TrackFile {
 	public:
 		AudioFile       (const char *filename, bool &error);
+		~AudioFile      ();
+
+		AudioFile       () = delete;
+		AudioFile       (const AudioFile&) = delete; // prevent copying
+		AudioFile&      operator= (const AudioFile&) = delete; // prevent assignment
+
 		bool            read(Bit8u *buffer, int seek, int count) {
 		                    (void)buffer; // unused but part of the API
 		                    (void)seek;   // ...
@@ -160,10 +172,8 @@ private:
 		Bit32u          getRate();
 		Bit8u           getChannels();
 		int             getLength();
-		~AudioFile();
 	private:
 		Sound_Sample    *sample;
-		AudioFile();
 	};
 
 public:
diff --git a/src/dos/dos_mscdex.cpp b/src/dos/dos_mscdex.cpp
index c29e42d6..56f4ea11 100644
--- a/src/dos/dos_mscdex.cpp
+++ b/src/dos/dos_mscdex.cpp
@@ -60,9 +60,9 @@ static Bitu MSCDEX_Strategy_Handler(void);
 static Bitu MSCDEX_Interrupt_Handler(void);
 static MountType MSCDEX_GetMountType(const char *path);
 
-class DOS_DeviceHeader:public MemStruct {
+class DOS_DeviceHeader : public MemStruct {
 public:
-	DOS_DeviceHeader(PhysPt ptr)				{ pt = ptr; };
+	DOS_DeviceHeader(PhysPt ptr) { pt = ptr; }
 	
 	void	SetNextDeviceHeader	(RealPt ptr)	{ sSave(sDeviceHeader,nextDeviceHeader,ptr);	};
 	RealPt	GetNextDeviceHeader	(void)			{ return sGet(sDeviceHeader,nextDeviceHeader);	};
@@ -78,7 +78,7 @@ public:
 	#ifdef _MSC_VER
 	#pragma pack(1)
 	#endif
-	struct sDeviceHeader{
+	struct sDeviceHeader {
 		RealPt	nextDeviceHeader;
 		Bit16u	devAttributes;
 		Bit16u	strategy;
@@ -87,7 +87,7 @@ public:
 		Bit16u  wReserved;
 		Bit8u	driveLetter;
 		Bit8u	numSubUnits;
-	} GCC_ATTRIBUTE(packed) TDeviceHeader;
+	} GCC_ATTRIBUTE(packed);
 	#ifdef _MSC_VER
 	#pragma pack()
 	#endif
@@ -95,11 +95,14 @@ public:
 
 class CMscdex {
 public:
-	CMscdex		(void);
-	~CMscdex	(void);
+	CMscdex  ();
+	~CMscdex ();
+
+	CMscdex            (const CMscdex&) = delete; // prevent copying
+	CMscdex& operator= (const CMscdex&) = delete; // prevent assignment
 
 	Bit16u		GetVersion			(void)	{ return (MSCDEX_VERSION_HIGH<<8)+MSCDEX_VERSION_LOW; };
-	Bit16u		GetNumDrives		(void)	{ return numDrives;			};
+	Bit16u   GetNumDrives (void) const { return numDrives; }
 	Bit16u		GetFirstDrive		(void)	{ return dinfo[0].drive; };
 	Bit8u		GetSubUnit			(Bit16u _drive);
 	bool		GetUPC				(Bit8u subUnit, Bit8u& attr, char* upc);
@@ -158,32 +161,33 @@ private:
 		TCtrl	audioCtrl;		// audio channel control
 	} TDriveInfo;
 
-	Bit16u				defaultBufSeg;
-	TDriveInfo			dinfo[MSCDEX_MAX_DRIVES];
-	CDROM_Interface*	cdrom[MSCDEX_MAX_DRIVES];
+	Bit16u            defaultBufSeg;
+	TDriveInfo        dinfo[MSCDEX_MAX_DRIVES];
+	CDROM_Interface * cdrom[MSCDEX_MAX_DRIVES];
 	
 public:
-	Bit16u		rootDriverHeaderSeg;
+	Bit16u rootDriverHeaderSeg;
 
-	bool		ChannelControl		(Bit8u subUnit, TCtrl ctrl);
-	bool		GetChannelControl	(Bit8u subUnit, TCtrl& ctrl);
+	bool ChannelControl(Bit8u subUnit, TCtrl ctrl);
+	bool GetChannelControl(Bit8u subUnit, TCtrl &ctrl);
 };
 
-CMscdex::CMscdex(void) {
-	numDrives			= 0;
-	rootDriverHeaderSeg	= 0;
-	defaultBufSeg		= 0;
-
-	memset(dinfo,0,sizeof(dinfo));
-	for (Bit32u i=0; i<MSCDEX_MAX_DRIVES; i++) cdrom[i] = 0;
+CMscdex::CMscdex()
+	: numDrives(0),
+	  defaultBufSeg(0),
+	  rootDriverHeaderSeg(0)
+{
+	memset(dinfo, 0, sizeof(dinfo));
+	for (auto &drive : cdrom)
+		drive = nullptr;
 }
 
-CMscdex::~CMscdex(void) {
-	defaultBufSeg = 0;
-	for (Bit16u i=0; i<GetNumDrives(); i++) {
-		delete (cdrom)[i];
+CMscdex::~CMscdex()
+{
+	for (size_t i = 0; i < GetNumDrives(); i++) {
+		delete cdrom[i];
 		cdrom[i] = 0;
-	};
+	}
 }
 
 void CMscdex::GetDrives(PhysPt data)