Short for SFV (Simple File Verification).

Yes. SFV file is a simple text file. It uses CRC32 algorithm to complete simple file detection function, calculates the value of each file, and writes it into an. SFV text file. Generally, after downloading, SFV tool will be used to calculate the downloaded file and compare the results with those in the file. If not, the downloaded file is wrong and needs to be downloaded again. And use the program to calculate the scale, size, date, etc. Specify a file or a batch of files and save them.

CRC32: CRC itself means "redundant check code". CRC32 indicates that a 32-bit (8-bit hexadecimal number) check value will be generated. Because every bit of the source data block participates in the calculation when CRC32 generates the check value, even if only one bit in the data block changes, different CRC32 values will be obtained.

MD5: The name of the message digest algorithm (also known as one-way hash function). It finally generates a check value of 128 bits (a hexadecimal number of 32 bits 16) according to each bit of the source data through a certain algorithm. The most common application of MD5 is in cryptography. In this paper, it is mainly used for the integrity of mcrc-if you find the above difficult to understand, you can simply think that MD5 is a 128-bit digital signature, which can be used to determine whether mcrc has been modified.

SFV is most commonly used in RAR, MP3, ISO and other file formats.