English to Chinese Tech/Engineering IT (Information Technology) Data Deduping

He thinks that the actual format that electronic data is stored in is not the key thing. In effect all electronic representations reconstruct a file for viewing or printing. What matters is that the content is original, not that the representation is in WORM format.
He said: "We look at the hash value of the file's contents compared to what we know was the original value. We are told, for example, that file A on disk is the original file and we compute its hash value and compare it to other copies of the file to see if it has changed." {He couldn't necessarily say what has changed, only that something has.}
The hash value is the determinant and even so little a change as adding an extra space between words can alter it.