diff --git a/bochs/iodev/hdimage/hdimage.cc b/bochs/iodev/hdimage/hdimage.cc
index 05818ffc5..49fb07967 100644
--- a/bochs/iodev/hdimage/hdimage.cc
+++ b/bochs/iodev/hdimage/hdimage.cc
@@ -2004,6 +2004,8 @@ int undoable_image_t::open(const char* pathname, int flags)
   if (mode == BX_HDIMAGE_MODE_UNKNOWN) {
     BX_PANIC(("r/o disk image mode not detected"));
     return -1;
+  } else {
+    BX_INFO(("base image mode = '%s'", hdimage_mode_names[mode]));
   }
   ro_disk = DEV_hdimage_init_image(mode, 0, NULL);
   if (ro_disk == NULL) {
@@ -2139,6 +2141,8 @@ int volatile_image_t::open(const char* pathname, int flags)
   if (mode == BX_HDIMAGE_MODE_UNKNOWN) {
     BX_PANIC(("r/o disk image mode not detected"));
     return -1;
+  } else {
+    BX_INFO(("base image mode = '%s'", hdimage_mode_names[mode]));
   }
   ro_disk = DEV_hdimage_init_image(mode, 0, NULL);
   if (ro_disk == NULL) {
diff --git a/bochs/iodev/hdimage/vmware4.cc b/bochs/iodev/hdimage/vmware4.cc
index 9a53bfd4a..44cc7910f 100644
--- a/bochs/iodev/hdimage/vmware4.cc
+++ b/bochs/iodev/hdimage/vmware4.cc
@@ -86,7 +86,7 @@ int vmware4_image_t::open(const char* _pathname, int flags)
   is_dirty = 0;
 
   hd_size = header.total_sectors * SECTOR_SIZE;
-  cylinders = (unsigned)hd_size / (16 * 63);
+  cylinders = (unsigned)(header.total_sectors / (16 * 63));
   heads = 16;
   spt = 63;
 
diff --git a/bochs/misc/bxcompat.h b/bochs/misc/bxcompat.h
index 76ecd3383..e11802d3f 100644
--- a/bochs/misc/bxcompat.h
+++ b/bochs/misc/bxcompat.h
@@ -59,6 +59,8 @@ enum {
 #define BX_HDIMAGE_MODE_LAST     BX_HDIMAGE_MODE_VPC
 #define BX_HDIMAGE_MODE_UNKNOWN  -1
 
+extern const char *hdimage_mode_names[];
+
 // definitions for compatibility with Bochs
 #ifndef UNUSED
 #  define UNUSED(x) ((void)x)
diff --git a/bochs/misc/bximage.cc b/bochs/misc/bximage.cc
index 648c25383..4d1979e46 100644
--- a/bochs/misc/bximage.cc
+++ b/bochs/misc/bximage.cc
@@ -81,6 +81,22 @@
 
 const int bx_max_hd_megs = (int)(((1 << BX_MAX_CYL_BITS) - 1) * 16.0 * 63.0 / 2048.0);
 
+const char *hdimage_mode_names[] = {
+  "flat",
+  "concat",
+  "external",
+  "dll",
+  "sparse",
+  "vmware3",
+  "vmware4",
+  "undoable",
+  "growing",
+  "volatile",
+  "vvfat",
+  "vpc",
+  NULL
+};
+
 int  bximage_mode;
 int  bx_hdimage;
 int  bx_fdsize_idx;
@@ -641,8 +657,11 @@ void convert_image(int newimgmode, Bit64u newsize)
   if (mode == -1) {
     mode = hdimage_detect_image_mode(bx_filename_1);
   }
-  if (mode == BX_HDIMAGE_MODE_UNKNOWN)
+  if (mode == BX_HDIMAGE_MODE_UNKNOWN) {
     fatal("source disk image mode not detected");
+  } else {
+    BX_INFO(("source image mode = '%s'", hdimage_mode_names[mode]));
+  }
 
   source_image = init_image(mode);
   if (source_image->open(bx_filename_1, O_RDONLY) < 0)