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8. PW-2 is Sh. R. K. Srivastava, Principal Scientific Officer, CFSL, who deposed that on 10.11.2014, he received one DVD marked as Exhibit-Q1 in unsealed condition from physics division for computation of hash value and he reported that DVD Exhibit Q1 was found fully functional and undamaged and mentioned its MD5 hash value in his report as Ex. PW-2/A. In his cross-examination, Ld. Defence counsel asked about the word "with 2369 errors" mentioned in Ex. PW-2/A and witness replied that during hashing process "2369 errors" were encountered but with repeatability, it means that DVD reproduced the hashing. He further deposed that the sector which are not readable are marked as bad sectors and the bad sectors are counted as errors. He confirmed that there was no bad sector recorded in the file i.e. .7.mov. He further confirmed that if the data copied is the same, the hash value would be same.