Here is the predicament that will probably seem familiar to you:
You are downloading <insert someone’s name here>’s <insert an activity name here> recordings, however since it is a HUGE file; it is compressed in multi-part form to make it suitable for file sharing sites.
You start downloading it by getting all parts; one by one. You start extracting it; you call your friends/family to watch it together only to see that the CRC check has failed on the last part! 😦 (or any other, but for purposes of demonstration, assume that it is some part close to the last one)
CRC(Cyclic Redundancy Check) is an Error Correction Code. If the CRC check fails on a file, it means that during the transmission of that particular file; some bits were corrupted causing the CRC check to fail.
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You could, of course, try to repair it by opening the faulty part and selecting “Repair archive” from the Tools menu as shown on the bottom, and trying to extract it again.
But what if that also fails?
Ozan Safi 