diff --git a/base/setup/usetup/partlist.c b/base/setup/usetup/partlist.c
index 2a9b49354b7..2ecca8f3fc8 100644
--- a/base/setup/usetup/partlist.c
+++ b/base/setup/usetup/partlist.c
@@ -88,12 +88,12 @@ AssignDriverLetters (PPARTLIST List)
                                      PARTENTRY,
                                      ListEntry);
 
-      for (i=0; i<3; i++)
+      for (i=0; i<4; i++)
         PartEntry->DriveLetter[i] = 0;
 
       if (PartEntry->Unpartitioned == FALSE)
       {
-        for (i=0; i<3; i++)
+        for (i=0; i<4; i++)
         {
           if (IsContainerPartition (PartEntry->PartInfo[i].PartitionType))
             continue;
@@ -374,7 +374,8 @@ ScanForUnpartitionedDiskSpace (PDISKENTRY DiskEntry)
           PartEntry->PartInfo[j].StartingOffset.QuadPart -
           (LastStartingOffset + LastPartitionLength);
 
-          if (LastUnusedPartitionLength >= DiskEntry->CylinderSize)
+          if (PartEntry->PartInfo[j].StartingOffset.QuadPart > (LastStartingOffset + LastPartitionLength) &&
+              LastUnusedPartitionLength >= DiskEntry->CylinderSize)
           {
             DPRINT ("Unpartitioned disk space %I64u\n", LastUnusedPartitionLength);
 
@@ -718,7 +719,8 @@ AddDiskToList (HANDLE FileHandle,
     return;
   }
 
-  if (DiskGeometry.MediaType != FixedMedia)
+  if (DiskGeometry.MediaType != FixedMedia &&
+      DiskGeometry.MediaType != RemovableMedia)
   {
     return;
   }
@@ -836,8 +838,12 @@ AddDiskToList (HANDLE FileHandle,
 
   if (!DiskEntry->BiosFound)
   {
+#if 0
     RtlFreeHeap(ProcessHeap, 0, DiskEntry);
     return;
+#else
+    DPRINT1("WARNING: Setup could not find a matching BIOS disk entry. Disk %d is not be bootable by the BIOS!\n", DiskNumber);
+#endif
   }
 
   InitializeListHead (&DiskEntry->PartListHead);