If you need a file system and not a handler then trying for a SHARED_LOCK with Lock() might be more appropriate than using ExamineObjectTags() if you don't need the ExamineData structure. Also if the name really must be a volume and not an assign or device or something else you can search the doslist manually using LockDosList()/FindDosEntry()/UnlockDosList(). This is a bit low level but you won't have to disable error requesters then.