Are the 160 bit hash values generated by SHA-1 large enough to ensure the fingerprint of every block is unique? Assuming random hash values with a uniform distribution, a collection of n different data blocks and a hash function that generates b bits, the probability p that there will be one or more collisions is bounded by the number of pairs of blocks multiplied by the probability that a given pair will collide.
(source : http://bitcache.org/faq/hash-collision-probabilities)
Read full article from hash - Probability of SHA1 collisions - Stack Overflow
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