diff --git a/src/raspberrypi/devices/host_services.cpp b/src/raspberrypi/devices/host_services.cpp
index 844870c6..f5dd0d75 100644
--- a/src/raspberrypi/devices/host_services.cpp
+++ b/src/raspberrypi/devices/host_services.cpp
@@ -59,8 +59,7 @@ void HostServices::TestUnitReady(SCSIDEV *controller)
 
 vector<BYTE> HostServices::Inquiry() const
 {
-	// Processor device, SPC-5, not removable
-	return PrimaryDevice::Inquiry(3, 7, false);
+	return PrimaryDevice::Inquiry(device_type::PROCESSOR, scsi_level::SPC_5, false);
 }
 
 void HostServices::StartStopUnit(SCSIDEV *controller)
diff --git a/src/raspberrypi/devices/primary_device.cpp b/src/raspberrypi/devices/primary_device.cpp
index 1a15e332..cd9a1742 100644
--- a/src/raspberrypi/devices/primary_device.cpp
+++ b/src/raspberrypi/devices/primary_device.cpp
@@ -111,7 +111,6 @@ void PrimaryDevice::RequestSense(SASIDEV *controller)
 
 		controller->Error(sense_key::ILLEGAL_REQUEST, asc::INVALID_LUN);
 		ctrl->status = 0x00;
-		return;
 	}
 
 	size_t allocation_length = ctrl->cmd[4];
@@ -161,21 +160,20 @@ bool PrimaryDevice::CheckReady()
 	return true;
 }
 
-vector<BYTE> PrimaryDevice::Inquiry(int type, int scsi_level, bool is_removable) const
+vector<BYTE> PrimaryDevice::Inquiry(device_type type, scsi_level level, bool is_removable) const
 {
 	vector<BYTE> buf = vector<BYTE>(0x1F + 5);
 
 	// Basic data
-	// buf[0] ... SCSI Device type
+	// buf[0] ... SCSI device type
 	// buf[1] ... Bit 7: Removable/not removable
-	// buf[2] ... SCSI-2 compliant command system
-	// buf[3] ... SCSI-2 compliant Inquiry response
+	// buf[2] ... SCSI compliance level of command system
+	// buf[3] ... SCSI compliance level of Inquiry response
 	// buf[4] ... Inquiry additional data
 	buf[0] = type;
 	buf[1] = is_removable ? 0x80 : 0x00;
-	buf[2] = scsi_level;
-	// Response data format is SCSI-2 for devices supporting SCSI-2 or newer, otherwise it is SCSI-1-CCS
-	buf[3] = scsi_level >= 2 ? 2 : 1;
+	buf[2] = level;
+	buf[3] = level >= scsi_level::SCSI_2 ? scsi_level::SCSI_2 : scsi_level::SCSI_1_CCS;
 	buf[4] = 0x1F;
 
 	// Padded vendor, product, revision
diff --git a/src/raspberrypi/devices/primary_device.h b/src/raspberrypi/devices/primary_device.h
index 30fff210..4ba6661a 100644
--- a/src/raspberrypi/devices/primary_device.h
+++ b/src/raspberrypi/devices/primary_device.h
@@ -41,7 +41,7 @@ public:
 
 protected:
 
-	vector<BYTE> Inquiry(int, int, bool) const;
+	vector<BYTE> Inquiry(scsi_defs::device_type, scsi_level, bool) const;
 
 	SASIDEV::ctrl_t *ctrl;
 
diff --git a/src/raspberrypi/devices/scsi_daynaport.cpp b/src/raspberrypi/devices/scsi_daynaport.cpp
index 5b77fc1c..5d3b9625 100644
--- a/src/raspberrypi/devices/scsi_daynaport.cpp
+++ b/src/raspberrypi/devices/scsi_daynaport.cpp
@@ -114,8 +114,7 @@ void SCSIDaynaPort::Open(const Filepath& path)
 
 vector<BYTE> SCSIDaynaPort::Inquiry() const
 {
-	// Processor device, SCSI-2, not removable
-	return PrimaryDevice::Inquiry(3, 2, false);
+	return PrimaryDevice::Inquiry(device_type::PROCESSOR, scsi_level::SCSI_2, false);
 }
 
 //---------------------------------------------------------------------------
diff --git a/src/raspberrypi/devices/scsi_host_bridge.cpp b/src/raspberrypi/devices/scsi_host_bridge.cpp
index 3f055f63..bb84e8de 100644
--- a/src/raspberrypi/devices/scsi_host_bridge.cpp
+++ b/src/raspberrypi/devices/scsi_host_bridge.cpp
@@ -101,8 +101,7 @@ bool SCSIBR::Dispatch(SCSIDEV *controller)
 
 vector<BYTE> SCSIBR::Inquiry() const
 {
-	// Communications device, SCSI-2, not removable
-	vector<BYTE> b = PrimaryDevice::Inquiry(9, 2, false);
+	vector<BYTE> b = PrimaryDevice::Inquiry(device_type::COMMUNICATIONS, scsi_level::SCSI_2, false);
 
 	// The bridge returns 6 more additional bytes than the other devices
 	vector<BYTE> buf = vector<BYTE>(0x1F + 8 + 5);
diff --git a/src/raspberrypi/devices/scsi_printer.cpp b/src/raspberrypi/devices/scsi_printer.cpp
index c3eb6e5b..3445fcfc 100644
--- a/src/raspberrypi/devices/scsi_printer.cpp
+++ b/src/raspberrypi/devices/scsi_printer.cpp
@@ -105,8 +105,7 @@ void SCSIPrinter::TestUnitReady(SCSIDEV *controller)
 
 vector<BYTE> SCSIPrinter::Inquiry() const
 {
-	// Printer device, SCSI-2, not removable
-	return PrimaryDevice::Inquiry(2, 2, false);
+	return PrimaryDevice::Inquiry(device_type::PRINTER, scsi_level::SCSI_2, false);
 }
 
 void SCSIPrinter::ReserveUnit(SCSIDEV *controller)
diff --git a/src/raspberrypi/devices/scsicd.cpp b/src/raspberrypi/devices/scsicd.cpp
index 694be96f..65f9c933 100644
--- a/src/raspberrypi/devices/scsicd.cpp
+++ b/src/raspberrypi/devices/scsicd.cpp
@@ -399,8 +399,7 @@ void SCSICD::ReadToc(SASIDEV *controller)
 
 vector<BYTE> SCSICD::Inquiry() const
 {
-	// CD-ROM device, SCSI-2, removable
-	return PrimaryDevice::Inquiry(5, 2, true);
+	return PrimaryDevice::Inquiry(device_type::CD_ROM, scsi_level::SCSI_2, true);
 
 //
 // The following code worked with the modified Apple CD-ROM drivers. Need to
diff --git a/src/raspberrypi/devices/scsihd.cpp b/src/raspberrypi/devices/scsihd.cpp
index d4204736..b066d2b7 100644
--- a/src/raspberrypi/devices/scsihd.cpp
+++ b/src/raspberrypi/devices/scsihd.cpp
@@ -100,8 +100,7 @@ void SCSIHD::Open(const Filepath& path)
 
 vector<BYTE> SCSIHD::Inquiry() const
 {
-	// Direct access device, SCSI-2
-	return PrimaryDevice::Inquiry(0, 2, IsRemovable());
+	return PrimaryDevice::Inquiry(device_type::DIRECT_ACCESS, scsi_level::SCSI_2, IsRemovable());
 }
 
 bool SCSIHD::ModeSelect(const DWORD *cdb, const BYTE *buf, int length)
diff --git a/src/raspberrypi/devices/scsihd_nec.cpp b/src/raspberrypi/devices/scsihd_nec.cpp
index e4653638..f7af9bbe 100644
--- a/src/raspberrypi/devices/scsihd_nec.cpp
+++ b/src/raspberrypi/devices/scsihd_nec.cpp
@@ -137,8 +137,7 @@ void SCSIHD_NEC::Open(const Filepath& path)
 
 vector<BYTE> SCSIHD_NEC::Inquiry() const
 {
-	// Direct access device, SCSI-1-CCS, not removable
-	return PrimaryDevice::Inquiry(0, 1, false);
+	return PrimaryDevice::Inquiry(device_type::DIRECT_ACCESS, scsi_level::SCSI_1_CCS, false);
 }
 
 void SCSIHD_NEC::AddErrorPage(map<int, vector<BYTE>>& pages, bool) const
diff --git a/src/raspberrypi/devices/scsimo.cpp b/src/raspberrypi/devices/scsimo.cpp
index 8a3c2237..ea8b909f 100644
--- a/src/raspberrypi/devices/scsimo.cpp
+++ b/src/raspberrypi/devices/scsimo.cpp
@@ -65,8 +65,7 @@ void SCSIMO::Open(const Filepath& path)
 
 vector<BYTE> SCSIMO::Inquiry() const
 {
-	// Optical memory device, SCSI-2, removable
-	return PrimaryDevice::Inquiry(7, 2, true);
+	return PrimaryDevice::Inquiry(device_type::OPTICAL_MEMORY, scsi_level::SCSI_2, true);
 }
 
 void SCSIMO::SetDeviceParameters(BYTE *buf)
diff --git a/src/raspberrypi/scsi.h b/src/raspberrypi/scsi.h
index d51ee671..e5f1ac20 100644
--- a/src/raspberrypi/scsi.h
+++ b/src/raspberrypi/scsi.h
@@ -124,6 +124,21 @@ private:
 //
 //===========================================================================
 namespace scsi_defs {
+	enum scsi_level : int {
+		SCSI_1_CCS = 1,
+		SCSI_2 = 2,
+		SPC_5 = 7
+	};
+
+	enum device_type : int {
+		DIRECT_ACCESS = 0,
+		PRINTER = 2,
+		PROCESSOR = 3,
+		CD_ROM = 5,
+		OPTICAL_MEMORY = 7,
+		COMMUNICATIONS = 9
+	};
+
 	enum scsi_command : int {
 		eCmdTestUnitReady = 0x00,
 		eCmdRezero =  0x01,