diff --git a/overviewer_core/nbt.py b/overviewer_core/nbt.py
index 7a8ee46..37e3770 100644
--- a/overviewer_core/nbt.py
+++ b/overviewer_core/nbt.py
@@ -292,7 +292,10 @@ class MCRFileReader(object):
         self._file.seek(offset)
 
         # read in the chunk data header
-        header = self._file.read(5)
+        try:
+            header = self._file.read(5)
+        except OSError as e:
+            raise CorruptChunkError("An OSError occurred: {}".format(e.strerror))
         if len(header) != 5:
             raise CorruptChunkError("chunk header is invalid")
         data_length, compression = self._chunk_header_format.unpack(header)
diff --git a/overviewer_core/world.py b/overviewer_core/world.py
index f1d67a0..e121002 100644
--- a/overviewer_core/world.py
+++ b/overviewer_core/world.py
@@ -1355,12 +1355,11 @@ class RegionSet(object):
             except nbt.CorruptionError as e:
                 tries -= 1
                 if tries > 0:
-                    # Flush the region cache to possibly read a new region file
-                    # header
-                    logging.debug("Encountered a corrupt chunk at %s,%s. Flushing cache and retrying", x, z)
-                    #logging.debug("Error was:", exc_info=1)
+                    # Flush the region cache to possibly read a new region file header
+                    logging.debug("Encountered a corrupt chunk or read error at %s,%s. "
+                                  "Flushing cache and retrying", x, z)
                     del self.regioncache[regionfile]
-                    time.sleep(0.5)
+                    time.sleep(0.25)
                     continue
                 else:
                     logging.warning("The following was encountered while reading from %s:", self.regiondir)