系统内冗余或重复数据的度量，表明存储和潜在性能问题效率低下。
1 LDPC = 1 PB
1 PB = 1 LDPC
例子:
将15 LDPC代码冗余转换为奇偶校验的冗余：
15 LDPC = 15 PB
| LDPC代码冗余 | 奇偶校验的冗余 |
|---|---|
| 0.01 LDPC | 0.01 PB |
| 0.1 LDPC | 0.1 PB |
| 1 LDPC | 1 PB |
| 2 LDPC | 2 PB |
| 3 LDPC | 3 PB |
| 5 LDPC | 5 PB |
| 10 LDPC | 10 PB |
| 20 LDPC | 20 PB |
| 30 LDPC | 30 PB |
| 40 LDPC | 40 PB |
| 50 LDPC | 50 PB |
| 60 LDPC | 60 PB |
| 70 LDPC | 70 PB |
| 80 LDPC | 80 PB |
| 90 LDPC | 90 PB |
| 100 LDPC | 100 PB |
| 250 LDPC | 250 PB |
| 500 LDPC | 500 PB |
| 750 LDPC | 750 PB |
| 1000 LDPC | 1,000 PB |
| 10000 LDPC | 10,000 PB |
| 100000 LDPC | 100,000 PB |
规则