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Full user review
It splits and joins files, pure and simple.
Check for bad bits in the split files when you join? Good luck! The program has a checksum feature, but hardly anybody ever use it. Most people don't ever bother knowing what it's for! Too bad because it's important.
The program works if the servers you upload to is 120% reliable. If you have a somewhat problematic internet line, even the slightest mistake will render the resulting files unreadable. WinRAR is your best option, as it will scan for corruption and informs you which split files are damaged. Just try it a few times, and you will see that it's in fact easier to use than HJSplit. How important is your data? If it's mission critical, don't rely on HJSplit. Unless you want to find out the hard way.