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This extended Hamming code is popular in computer memory systems {{citation needed|date=October 2019}}, where it is known as ''SECDED'' (abbreviated from ''single error correction, double error detection'') {{citation needed|date=October 2019}}. Particularly popular is the (72,64) code, a truncated (127,120) Hamming code plus an additional parity bit {{citation needed|date=October 2019}}, which has the same space overhead as a (9,8) parity code.
==[7,4] Hamming code==
[[File:Hamming(7,4).svg|thumb|300px|Graphical depiction of the four data bits and three parity bits and which parity bits apply to which data bits]]
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