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Error during opening 7z file created using Multi Commander.

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Timon:
Exclusively for information: 7-Zip 15.12 stable release was published just 2 hours ago.

Mathias (Author):
Nice.. hopefully I got some time over so I can upgrade.

bushi:
Hello Mathias,

For what its worth, I am able to replicate something resembling this error - although I use 7Zip itself (not MC) to compress, but I am getting this error, when:
1. Create 7Zip archive (large ones, >several hundred megs - couple gigs)
2. Copy it TO a network drive (using MC - but that one goes properly; read on)
3. Copy it FROM the network drive, using MC (this might be the root cause - the FIRST copy operation FROM the network drive)
4. Try to open the file copied in 3., either by MC, or 7Zip  - got the "File corrupted" error
5. Copy the same archive FROM the network drive AGAIN (using MC, OVERWRITE the file copied in 3.) - after that, archive can be opened properly, both in MC, and 7Zip

So it looks like something dodgy happens in the FIRST copy operation FROM the network drive (since the same file, can be eventually opened, then it must be copied properly TO the network drive, and the second copy operation FROM the network, apparently, solves it)

Hope that helps.

Many thanks for your outstanding work on MC,

Regards,
Michal

Mathias (Author):
That is weird, then the first copy should be bad, without any error happen. I find that unlikely, unless there are bad blocks or bad memory.
But then you would see a lot of other bad files. Something else must have a hold on the file or something.
Latest release will output more errors in the logwindow. Maybe there is a error message there ?

So when the first copied are done, are the files the same size ?
Select the files in source and and target panel and select Menu>Tools>CheckSum>Compare Two files
and it will do a checksum compare on them and tell you if the content of them are different.

When you copied a archive, many AntiVirus software will take a hold on the file and check the archive before any program may use it.
And if the archive are large this can take some times. And when the files is copied a second time then it already have the hash of that file it's databas where it say it is okey. and is not doing a check that time ..  Maybe this is happening ?

bushi:

--- Quote from: Mathias (Author) on December 03, 2015, 13:41:52 ---(...) many AntiVirus software will take a hold on the file and check the archive before any program may use it.
And if the archive are large this can take some times.(...)

--- End quote ---
...ahhh, brilliant, well spotted... let me check this, but that smells like the real cause, thanks! That would explain why the network drive must be involved - company policies/antivir settings!

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