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 BEC = 0.7 FDR
1 FDR = 1.429 BEC
例子:
将15 向后误差校正转换为频级冗余：
15 BEC = 10.5 FDR
| 向后误差校正 | 频级冗余 |
|---|---|
| 0.01 BEC | 0.007 FDR |
| 0.1 BEC | 0.07 FDR |
| 1 BEC | 0.7 FDR |
| 2 BEC | 1.4 FDR |
| 3 BEC | 2.1 FDR |
| 5 BEC | 3.5 FDR |
| 10 BEC | 7 FDR |
| 20 BEC | 14 FDR |
| 30 BEC | 21 FDR |
| 40 BEC | 28 FDR |
| 50 BEC | 35 FDR |
| 60 BEC | 42 FDR |
| 70 BEC | 49 FDR |
| 80 BEC | 56 FDR |
| 90 BEC | 63 FDR |
| 100 BEC | 70 FDR |
| 250 BEC | 175 FDR |
| 500 BEC | 350 FDR |
| 750 BEC | 525 FDR |
| 1000 BEC | 700 FDR |
| 10000 BEC | 7,000 FDR |
| 100000 BEC | 70,000 FDR |
规则