What is CRC? And how does it help in error detection?

networking crc error-detection
Priya picture Priya · Dec 24, 2009 · Viewed 15.9k times · Source

What is CRC? And how does it help in error detection?

Answer

Daniel Vassallo picture Daniel Vassallo · Dec 24, 2009

CRC is a non-secure hash function designed to detect accidental changes to raw computer data, and is commonly used in digital networks and storage devices such as hard disk drives.

A CRC-enabled device calculates a short, fixed-length binary sequence, known as the CRC code, for each block of data and sends or stores them both together. When a block is read or received the device repeats the calculation; if the new CRC code does not match the one calculated earlier, then the block contains a data error and the device may take corrective action such as requesting the block be sent again.

Source: Wikipedia

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