The term CRC may refer to the check code or to the function that calculates it, which accepts data streams of any length as input but always outputs a fixed-length code. When a block is read or received the device repeats the calculation if the new CRC does not match the one calculated earlier, then the block contains a data error and the device may take corrective action such as rereading or requesting the block be sent again, otherwise the data is assumed to be error free (though, with some small probability, it may contain undetected errors this is the fundamental nature of error checking).ĬRCs are so called because the check (data verification) code is a redundancy (it adds zero information to the message) and the algorithm is based on cyclic codes. A CRC enabled device calculates a short, fixed length binary sequence, known as the CRC code or just CRC, for each block of data and sends or stores them both together. Given a 10 bit sequence 1011001001 and a divisor of 1011, find the CRC.Ī cyclic redundancy check (CRC) or polynomial code checksum 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.
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