}

		// setup stale disks for the test case
		staleDisks := make([]StorageAPI, len(disks))
		copy(staleDisks, disks)
		for j := range staleDisks {
			if j < test.offDisks {
				readers[j] = nil
			} else {
				staleDisks[j] = nil
			}
		}
		for j := 0; j < test.badDisks; j++ {
			switch r := readers[test.offDisks+j].(type) {