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 DC = 0.55 PB
1 PB = 1.818 DC
例子:
将15 差分编码转换为奇偶校验的冗余：
15 DC = 8.25 PB
| 差分编码 | 奇偶校验的冗余 |
|---|---|
| 0.01 DC | 0.006 PB |
| 0.1 DC | 0.055 PB |
| 1 DC | 0.55 PB |
| 2 DC | 1.1 PB |
| 3 DC | 1.65 PB |
| 5 DC | 2.75 PB |
| 10 DC | 5.5 PB |
| 20 DC | 11 PB |
| 30 DC | 16.5 PB |
| 40 DC | 22 PB |
| 50 DC | 27.5 PB |
| 60 DC | 33 PB |
| 70 DC | 38.5 PB |
| 80 DC | 44 PB |
| 90 DC | 49.5 PB |
| 100 DC | 55 PB |
| 250 DC | 137.5 PB |
| 500 DC | 275 PB |
| 750 DC | 412.5 PB |
| 1000 DC | 550 PB |
| 10000 DC | 5,500 PB |
| 100000 DC | 55,000 PB |
规则