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==Types of ECC==
{{Main|Block code|Convolutional code}}
 
[[File:BlockCont.png|right|500px|thumb|A short classification of the error correction codes.]]
 
The two main categories of ECC codes are [[block code]]s and [[convolutional code]]s.
* Block codes work on fixed-size blocks (packets) of bits or symbols of predetermined size. Practical block codes can generally be hard-decoded in [[polynomial time]] to their block length.