>>>>>I have downloaded a file which is about 4.3 Gb. It is a zip file. When I try to extract all I get message that there is not enough space. That 700 pb is required. I looked up the PB (Petabyte) and see that it is huge file. Could it be that this 4.3 Gb file has so much zipped?
>>>>
>>>>Sounds pretty corrupt to me.
>>>
>>>Yes, something is not right. I will check it (not sure how yet).
>>
>>What was the file supposed to contain (database? executable? an excel spreadsheet of all the data in the world?)?
>
>This file is downloaded using torrent software. The strange thing (and maybe it is because I don't understand how torrent program works) is that I can "open" the file within the torrent software and see all the files. But when I try to copy them somewhere I get this message that the file is too big. So it looks like the file is not corrupted.

Probably that file is not a .zip file. I think so it may be a DVD Image file or a movie file. Try rename to .MPEG or .NRG or .ISO or .IMG...