}
			for j := range disks[:test.offDisks] {
				switch w := writers[j].(type) {
				case *wholeBitrotWriter:
					w.disk = badDisk{nil}
				case *streamingBitrotWriter:
					w.closeWithErr(errFaultyDisk)
				}
			}
			if test.offDisks > 0 {
				writers[0] = nil
			}
			n, err = erasure.Encode(context.Background(), bytes.NewReader(data[test.offset:]), writers, buffer, erasure.dataBlocks+1)