diff --git a/src/work.py b/src/work.py
--- a/src/work.py
+++ b/src/work.py
@@ -15,7 +15,7 @@ DB_NAME="morevna.db"
 FILE_COUNT=2**21
 TARGET_DIR="temp"
 
-log.basicConfig(level=log.DEBUG)
+log.basicConfig(format="{asctime} {levelname}: {message}", style="{", level=log.DEBUG)
 
 class Pipeline:
 	def __init__(self,fileName):
@@ -29,8 +29,9 @@ class Pipeline:
 	def update(self):
 		log.info("starting update")
 		for (i,(chunk,storedHashRec)) in enumerate(zip_longest(self.chunks(), self.db.listHashes())):
+			assert storedHashRec is None or storedHashRec["sector_id"]==i, "{0}!={1} {2}".format(i, storedHashRec["sector_id"], storedHashRec)
 			if not chunk: break
-			hash=self.hash(chunk)
+			hash=Pipeline.hash(chunk)
 			storedHash=(storedHashRec and storedHashRec["sector_hash"]) or b"\0"
 			if hash==storedHash: continue
 			log.info("updating sector %d, hash %s != stored %s", i, hash.hex(), storedHash.hex())