It's handy for any sort of portability: using space on smaller hard drives and network transfers which do not support resuming connections.
Let's say your network protocol supports resuming: Afterwards, the hash may indicate that your file is broken anyway - a 4 TB image, not one of more than 1.000 split files. The required hashing (file based, not image vs. source, of course) breaks down to individual split files, too.
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