b.Fatalf("failed to create erasure test file: %v", err)
	}

	for i := range dataDown {
		writers[i] = nil
	}
	for i := data; i < data+parityDown; i++ {
		writers[i] = nil
	}

	b.SetBytes(size)
	b.ReportAllocs()
	for b.Loop() {
		bitrotReaders := make([]io.ReaderAt, len(disks))
		for index, disk := range disks {
			if writers[index] == nil {
				continue
			}