diff --git a/ironic/drivers/modules/image_utils.py b/ironic/drivers/modules/image_utils.py
index 2d1512c850..56ccb7de69 100644
--- a/ironic/drivers/modules/image_utils.py
+++ b/ironic/drivers/modules/image_utils.py
@@ -210,7 +210,7 @@ def prepare_floppy_image(task, params=None):
     :raises: SwiftOperationError, if any operation with Swift fails.
     :returns: image URL for the floppy image.
     """
-    object_name = _get_name(task.node, prefix='image')
+    object_name = _get_name(task.node, prefix='image', suffix='.img')
     params = override_api_url(params)
 
     LOG.debug("Trying to create floppy image for node "
@@ -220,7 +220,8 @@ def prepare_floppy_image(task, params=None):
             dir=CONF.tempdir, suffix='.img') as vfat_image_tmpfile_obj:
 
         vfat_image_tmpfile = vfat_image_tmpfile_obj.name
-        images.create_vfat_image(vfat_image_tmpfile, parameters=params)
+        images.create_vfat_image(vfat_image_tmpfile, fs_size_kib=1440,
+                                 parameters=params)
 
         img_handler = ImageHandler(task.node.driver)
         node_http_url = task.node.driver_info.get("external_http_url")
@@ -241,7 +242,8 @@ def cleanup_floppy_image(task):
 
     :param task: an ironic node object.
     """
-    ImageHandler.unpublish_image_for_node(task.node, prefix='image')
+    ImageHandler.unpublish_image_for_node(task.node, prefix='image',
+                                          suffix='.img')
 
 
 def prepare_configdrive_image(task, content):
diff --git a/ironic/tests/unit/drivers/modules/test_image_utils.py b/ironic/tests/unit/drivers/modules/test_image_utils.py
index cbc6969c11..bd197fc3d8 100644
--- a/ironic/tests/unit/drivers/modules/test_image_utils.py
+++ b/ironic/tests/unit/drivers/modules/test_image_utils.py
@@ -165,7 +165,7 @@ class RedfishImageUtilsTestCase(db_base.DbTestCase):
                                   shared=True) as task:
             image_utils.cleanup_floppy_image(task)
 
-            object_name = 'image-%s' % task.node.uuid
+            object_name = 'image-%s.img' % task.node.uuid
 
             mock_unpublish.assert_called_once_with(mock.ANY, object_name)
 
@@ -182,13 +182,13 @@ class RedfishImageUtilsTestCase(db_base.DbTestCase):
 
             url = image_utils.prepare_floppy_image(task)
 
-            object_name = 'image-%s' % task.node.uuid
+            object_name = 'image-%s.img' % task.node.uuid
 
             mock_publish_image.assert_called_once_with(mock.ANY, mock.ANY,
                                                        object_name, None)
 
             mock_create_vfat_image.assert_called_once_with(
-                mock.ANY, parameters=None)
+                mock.ANY, fs_size_kib=1440, parameters=None)
 
             self.assertEqual(expected_url, url)
 
@@ -206,13 +206,14 @@ class RedfishImageUtilsTestCase(db_base.DbTestCase):
 
             url = image_utils.prepare_floppy_image(task)
 
-            object_name = 'image-%s' % task.node.uuid
+            object_name = 'image-%s.img' % task.node.uuid
 
             mock_publish_image.assert_called_once_with(mock.ANY, mock.ANY,
                                                        object_name, None)
 
             mock_create_vfat_image.assert_called_once_with(
-                mock.ANY, parameters={"ipa-api-url": "http://callback"})
+                mock.ANY, fs_size_kib=1440,
+                parameters={"ipa-api-url": "http://callback"})
 
             self.assertEqual(expected_url, url)
 
@@ -232,13 +233,14 @@ class RedfishImageUtilsTestCase(db_base.DbTestCase):
 
             url = image_utils.prepare_floppy_image(task)
 
-            object_name = 'image-%s' % task.node.uuid
+            object_name = 'image-%s.img' % task.node.uuid
 
             mock_publish_image.assert_called_once_with(mock.ANY, mock.ANY,
                                                        object_name, None)
 
             mock_create_vfat_image.assert_called_once_with(
-                mock.ANY, parameters={"ipa-api-url": "http://callback"})
+                mock.ANY, fs_size_kib=1440,
+                parameters={"ipa-api-url": "http://callback"})
 
             self.assertEqual(expected_url, url)
 
@@ -261,13 +263,14 @@ class RedfishImageUtilsTestCase(db_base.DbTestCase):
 
             url = image_utils.prepare_floppy_image(task)
 
-            object_name = 'image-%s' % task.node.uuid
+            object_name = 'image-%s.img' % task.node.uuid
 
             mock_publish_image.assert_called_once_with(
                 mock.ANY, mock.ANY, object_name, override_url)
 
             mock_create_vfat_image.assert_called_once_with(
-                mock.ANY, parameters={"ipa-api-url": "http://callback"})
+                mock.ANY, fs_size_kib=1440,
+                parameters={"ipa-api-url": "http://callback"})
 
             self.assertEqual(expected_url, url)
 
diff --git a/releasenotes/notes/floppy-image-quirks-32e14d32a37b0742.yaml b/releasenotes/notes/floppy-image-quirks-32e14d32a37b0742.yaml
new file mode 100644
index 0000000000..f49fd25cdf
--- /dev/null
+++ b/releasenotes/notes/floppy-image-quirks-32e14d32a37b0742.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Some vendors insist that floppy images must be 1440 KiB in size and
+    that the file name ends with ``.img``. Make it so.