A+ Guide to Managing and Maintaining Your PC, 7e15 DIMM Technologies (cont'd.) Error-correcting code (ECC) –Detects and corrects error in a single bit –Application: ECC makes 64-bit DIMM a 72-bit module Parity –Error-checking based on an extra (ninth) bit –Odd parity Parity bit set to make odd number of ones –Even parity Parity bit set to make even number of ones Parity error –Number of bits conflicts with parity used
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