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What is cyclic redundancy check check on my external hard disk

Last response: in Windows 7
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February 4, 2013 3:43:40 PM

Hi

I have an WD external hard disc,its showing data error (cyclic redundancy check) and its also showing to format the disc.Please give me a right solution.
a b $ Windows 7
February 4, 2013 3:47:24 PM

run error checking tool to fix it. if that wont help it means your hard drive has scratches on the magnetic platters and you will see more and more errors with time so you will have to get a new one
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February 4, 2013 4:28:22 PM

Cyclic Redundancy Check is a mathematical equation used by your computer to ensure that data is received in tact. It multiples the number of bits in the data packet by a predetermined number prior to transmission of the data and holds on to the answer. Once the data is received, it runs the same equation again. If the two answers are the same, from before the transmission and after reception, then the system knows that the data was received in-tact.
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a b $ Windows 7
February 4, 2013 4:53:37 PM

Somewhat simular to Checksum:
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ChecksumsMain article: Checksum
A checksum of a message is a modular arithmetic sum of message code words of a fixed word length (e.g., byte values). The sum may be negated by means of a ones'-complement operation prior to transmission to detect errors resulting in all-zero messages.

Checksum schemes include parity bits, check digits, and longitudinal redundancy checks. Some checksum schemes, such as the Damm algorithm, the Luhn algorithm, and the Verhoeff algorithm, are specifically designed to detect errors commonly introduced by humans in writing down or remembering identification numbers.

Cyclic redundancy checks (CRCs)Main article: Cyclic redundancy check
A cyclic redundancy check (CRC) is a single-burst-error-detecting cyclic code and non-secure hash function designed to detect accidental changes to digital data in computer networks. It is not suitable for detecting maliciously introduced errors. It is characterized by specification of a so-called generator polynomial, which is used as the divisor in a polynomial long division over a finite field, taking the input data as the dividend, and where the remainder becomes the result.

Cyclic codes have favorable properties in that they are well suited for detecting burst errors. CRCs are particularly easy to implement in hardware, and are therefore commonly used in digital networks and storage devices such as hard disk drives
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