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 PB = 1.429 BEC
1 BEC = 0.7 PB
例子:
将15 奇偶校验的冗余转换为向后误差校正：
15 PB = 21.429 BEC
| 奇偶校验的冗余 | 向后误差校正 |
|---|---|
| 0.01 PB | 0.014 BEC |
| 0.1 PB | 0.143 BEC |
| 1 PB | 1.429 BEC |
| 2 PB | 2.857 BEC |
| 3 PB | 4.286 BEC |
| 5 PB | 7.143 BEC |
| 10 PB | 14.286 BEC |
| 20 PB | 28.571 BEC |
| 30 PB | 42.857 BEC |
| 40 PB | 57.143 BEC |
| 50 PB | 71.429 BEC |
| 60 PB | 85.714 BEC |
| 70 PB | 100 BEC |
| 80 PB | 114.286 BEC |
| 90 PB | 128.571 BEC |
| 100 PB | 142.857 BEC |
| 250 PB | 357.143 BEC |
| 500 PB | 714.286 BEC |
| 750 PB | 1,071.429 BEC |
| 1000 PB | 1,428.571 BEC |
| 10000 PB | 14,285.714 BEC |
| 100000 PB | 142,857.143 BEC |
规则