diff --git a/src/dvdisaster.c b/src/dvdisaster.c
index 50d89e2..77cafb0 100644
--- a/src/dvdisaster.c
+++ b/src/dvdisaster.c
@@ -92,6 +92,7 @@ typedef enum
    MODIFIER_NO_BDR_DEFECT_MANAGEMENT,
    MODIFIER_NO_PROGRESS,
    MODIFIER_OLD_DS_MARKER,
+   MODIFIER_PERMISSIVE_MEDIUM_TYPE,
    MODIFIER_PREFETCH_SECTORS,
    MODIFIER_RANDOM_SEED,
    MODIFIER_RAW_MODE,
@@ -249,6 +250,7 @@ int main(int argc, char *argv[])
 	{"no-bdr-defect-management", 0, 0, MODIFIER_NO_BDR_DEFECT_MANAGEMENT },
 	{"no-progress", 0, 0, MODIFIER_NO_PROGRESS },
 	{"old-ds-marker", 0, 0, MODIFIER_OLD_DS_MARKER },
+	{"permissive-medium-type", 0, 0, MODIFIER_PERMISSIVE_MEDIUM_TYPE },
 	{"prefetch-sectors", 1, 0, MODIFIER_PREFETCH_SECTORS },
         {"prefix", 1, 0, 'p'},
 	{"random-errors", 1, 0, MODE_RANDOM_ERR },
@@ -524,6 +526,10 @@ int main(int argc, char *argv[])
 	 case MODIFIER_OLD_DS_MARKER:
 	    Closure->dsmVersion = 0;
 	    break;
+	 case MODIFIER_PERMISSIVE_MEDIUM_TYPE:
+	    Closure->permissiveMediumType = TRUE;
+	    debug_mode_required = TRUE;
+	    break;
          case MODIFIER_PREFETCH_SECTORS:
  	    Closure->prefetchSectors = atoi(optarg);
 	    if(   Closure->prefetchSectors < 32
@@ -982,6 +988,7 @@ int main(int argc, char *argv[])
       { PrintCLI("\n");
 	PrintCLI(_("Debugging options (purposefully undocumented and possibly harmful)\n"));
 	PrintCLI(_("  --debug           - enables the following options\n"));
+	PrintCLI(_("  --permissive-medium-type - allow more media types, even theoretically unsupported ones\n"));
 	PrintCLI(_("  --byteset s,i,b   - set byte i in sector s to b\n"));
 	PrintCLI(_("  --cdump           - creates C #include file dumps instead of hexdumps\n")); 
 	PrintCLI(_("  --compare-images a,b  - compare sectors in images a and b\n"));
diff --git a/src/dvdisaster.h b/src/dvdisaster.h
index 4d61208..142c1d5 100644
--- a/src/dvdisaster.h
+++ b/src/dvdisaster.h
@@ -265,6 +265,7 @@ typedef struct _GlobalClosure
    int fixedSpeedValues;/* output fixed speed reading to make comparing debugging output easier */  
    int noBdrDefectManagement;/* if true, enable use of the BD*_NODM sizes, default: false */
    int ignoreRS03header; /* if true, ignore the RS03 header when repairing, forcing a full search (debug only) */
+   int permissiveMediumType; /* if true, don't bail out on some UNSUPPORTED medium types (debug only) */
    char *homeDir;       /* path to users home dir */
    char *dotFile;       /* path to .dvdisaster file */
    char *logFile;       /* path to logfile */
diff --git a/src/scsi-layer.c b/src/scsi-layer.c
index 539f7d0..01fcec3 100644
--- a/src/scsi-layer.c
+++ b/src/scsi-layer.c
@@ -922,13 +922,17 @@ static int query_dvd(DeviceHandle *dh, int probe_only)
 	 }
 
 	 dh->typeDescr = g_strdup("DVD-ROM");
-	 dh->subType = UNSUPPORTED;
+         /* this also happens to be the detected medium type for the Windows 10 iso mounter,
+            if you want to use it to test dvdisaster, use --permissive-medium-type */
+         if (!Closure->permissiveMediumType)
+	    dh->subType = UNSUPPORTED;
 	 break;
       }
 
       default: 
 	dh->typeDescr = g_strdup_printf("DVD book type 0x%02x",(phy_info4>>4) & 0x0f); 
-	dh->subType = UNSUPPORTED;
+        if (!Closure->permissiveMediumType)
+	   dh->subType = UNSUPPORTED;
 	break;
    }