Does Windows calculate CRCs to check every file operation?

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CRCs, or cyclic redundancy checks, are a type of error-detection algorithm used to detect data corruption in computer systems. They are commonly used in file systems to ensure that data is not lost or corrupted during file operations. When a file is transferred or stored in a computer system, the CRC algorithm is used to calculate a value for the file. This value is then compared to an expected value, and if the two values do not match, the file operation is aborted and an error is reported.

The CRC algorithm works by taking a block of data and calculating a mathematical value, known as a hash, for the data. This hash is then compared to the expected value, which is usually stored separately in the file system. If the two hashes do not match, then the data has been corrupted in some way and the file operation is aborted.

In Windows, CRCs are used in a variety of ways to check file operations. For example, when a file is copied from one location to another, the CRC algorithm is used to generate a hash for the source file and a hash for the destination file. These two hashes are then compared to each other, and if they do not match, then the file operation is aborted and an error is reported. Furthermore, when files are compressed, the CRC algorithm is used to check for data corruption before and after the compression process.

In addition to file operations, Windows also uses CRCs for network communication. When two computers are communicating, the CRC algorithm is used to generate a hash for the data that is being transferred between them. This hash is then sent along with the data and compared to the expected value at the receiving end. If the two hashes do not match, then the data has been corrupted in some way and the communication is aborted.

In summary, Windows uses the CRC algorithm to check for data corruption during file operations and network communication. The algorithm works by taking a block of data and calculating a hash for the data. This hash is then compared to the expected value, and if the two hashes do not match, then the data has been corrupted in some way and the file operation or communication is aborted. Using CRCs is a simple and effective way of ensuring that data is not lost or corrupted in computer systems.

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