Hello, Not sure what exactly is happening here but I will explain as much as I can in the hopes that someone can provide some advice. I've been trying to.ZIP up VM ware images in an attempt to save some HD space.

I've tried 7-Zip 4.65 (32 bit) and the newer 9.10 beta (64 bit). I'm running Vista 64 with 8 GB RAM. I can try to create a brand new.zip file using either mentioned version of 7-Zip. The archive creation will complete with no errors or warnings. Yet, when I immediately try to test or verify the newly created archive the test fails with a CRC error. Same CRC error if I try to extract the larger (> 1 GB but. There is obviously a bug in 7zip.

I have this problem too. I zipped a 4 gigabyte.ISO file. I used the 'store' method, which I assume means no compression. Split into 650 megabyte files. When I restore the original iso file from the parts, the MD5s don't match, and I get a CRC error from 7zip. I am using version 9.20 on windows 7 x64. I have done this twice on this machine, not only do I get the same error, but the MD5 of the restored 4 gigabyte iso file is the SAME.

That is, the incorrect MD5 of the corrupted, restored file, is the same when I repeat the archive/de-archive process. So the file is mangled in the same way each time.

When I use zip as the compression/store method rather than 7z, this problem does not occur. I wouldnt mind providing the.iso file for review, but cant really because not only is it 4 gigabytes, it's also copyrighted (I purchased/own the DVD).

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But I cant give the file to anyone else. I think if 7zip is tested with huge files this error should be reproducible. It's happened to me before with huge files.

Love 7zip and use it routinely, by the way, but there appears to be some insidious bug lurking in there that can mangle large files. The byte counts are precisely the same. There is a bug in 7-zip is the inescapable conclusion.

It's a simple process: Right-click on file, select 7-zip, add to archive Select 'store' and 7z as compression method, split into 650 MB Let operation finish Right-click on the first 7z file and select 'Extract to ' It extracts, gives CRC error The md5 of the extracted file differs from the original file. Same byte count. If this process is repeated, the resulting extracted file has the same MD5 as the first time this was done. Majalah maxim pdf magazine.

It's reproducible/repeatable. Change compression method to zip rather than 7z.

This doesnt happen. 7z without split is an interesting idea. Not feasible for me as i was transferring my file from my computer overseas to my laptop which I have with me on a trip, which is why I was doing this. I need smaller files for transfer (which I can do with zip compression). But for debugging purposes I am interested in 7z without compression, will try and post results.

When I issue the fc command, comparing either the original ISO file with the ISO file that is corrupted, it fills my screen with random ascii characters. The same happens with comparing the big.7z file that was never split, with the one that was split and rejoined. Is there some parameter I can use along with fc to get more useful information? Right now it just dumps a huge amount of random ascii characters on my screen. So fc shows that the files are different, but I'm wondering how to get the command to give some more specific info. Comparing the ISOs, the first error is at 091E01E1, with first column 11 and second column 00, then next byte is 00->80 After that, it's a continuous stream of every byte being wrong essentially.