--- 60-persistent-storage.rules-	2011-07-12 00:35:47.000000000 +0600
+++ 60-persistent-storage.rules	2012-03-15 15:27:27.353991577 +0600
@@ -14,7 +14,7 @@
 SUBSYSTEM!="block", GOTO="persistent_storage_end"
 
 # skip rules for inappropriate block devices
-KERNEL=="fd*|mtd*|nbd*|gnbd*|btibm*|dm-*|md*", GOTO="persistent_storage_end"
+KERNEL=="fd*|mtd*|nbd*|gnbd*|btibm*|dm-*|md*|ploop*", GOTO="persistent_storage_end"
 
 # ignore partitions that span the entire disk
 TEST=="whole_disk", GOTO="persistent_storage_end"