7z file error using LZMA2 Ultra

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#340 7z file error using LZMA2 Ultra

Status: open

Owner: Igor Pavlov

Labels: None

Priority: 1

Updated: 2019-11-25

Created: 2019-11-17

Creator: Navia Ang

Private: No

I create an autobackup app to zip my mysqldump files using
7z a -t7z -m0=lzma2 -mx=9 -aoa -mfb=64 -md=32m -ms=on -mhe -p"pass" "dest" "src" -isdel

Unfortunely, my app got error and zip keep running on Local Drive (D:)
and almost my important files is missing.

Open the zip file got error "Cannot open file xxxx as archive.

file size : 18.657.825.264 bytes

( HexEditor using Ultraedit )
0000000000000000h: 37 7A BC AF 27 1C 00 04 00 00 00 00 00 00 00 00 ; 7z¼¯'...........
0000000000000010h: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ; ................
0000000000000020h: FD 6C 03 38 52 5E 66 4A 16 4F 2D C7 85 16 CD 52 ; ýl.8R^fJ.O-Ç….ÍR

How to recover this archive.
Please..... need your advice. Thanks.

Discussion

Igor Pavlov - 2019-11-18

https://www.7-zip.org/recover.html
There is no correct End Header at the end of archive

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Navia Ang - 2019-11-19

how to determine values for split files in my case.
Can i used the same values ?

We call "Split file..." function for bad.7z and type "32 100G" in "Split to volumes, bytes:" field.
We call "Split file..." function for raw.7z and type "32 2968 100G" in "Split to volumes, bytes:"

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Igor Pavlov - 2019-11-19

you can split to

1G 200G

And try to recover from small 1G at first.
It will be faster.
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- Navia Ang - 2019-11-19
  
  can you assist me actually i don't really understand
  now i have
  bad.7z : 17,3 GB (18.657.825.264 bytes)
  raw.7z : 18,8 GB (20.265.075.126 bytes)
  
  bad.7z split to "1G 200G" ?
  raw.7z split to "32 2968 100G" ?
  
  Thanks.
  
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Igor Pavlov - 2019-11-19

get first 1G or 100 MB from bad,
and try to recover from that small part with same instructions.
It will be faster to get some result that can show that recovering is
possible.

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Navia Ang - 2019-11-19

are bad and raw split with same value "1G 200G" ?

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Navia Ang - 2019-11-19

can i use "32 100G" for raw.7zip ?

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Igor Pavlov - 2019-11-19

18g can be slow for your.
So try to work with smallest file at first (first 1 GB from 18g).
So you need only first 1 GB for first.
Then do all things as described in instruction.

raw.7z can be 1.1 GB.

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Navia Ang - 2019-11-19

I splited
bad.7z : 17,3 GB (18.657.825.264 bytes), split to "1G 200G"
raw.7z : 18,8 GB (20.265.075.126 bytes) split to "32 2968 100G"

after solit done, bad.7z.001 renamed to raw.7z.002/raw.7z.003.
Extract error : Unexptected end of data

WaXaAUHhus.png

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Igor Pavlov - 2019-11-20

Read
https://www.7-zip.org/recover.html
and try same actions as described there with same small files archives.
That way you can practice for whole recovering procedure.
If it works for small files, then do similar actions for your real data.

Create readme.txt.bz2, readme.zip, readme.txt.gzip and readme.txt.xz archives from readme.txt. ... Create a.7z with LZMA2 method that contains all files: readme.txt.bz2 readme.txt.gz readme.zip readme.txt readme.txt.xz ... Corrupt archive Now we currupt a.7z archive. We want to split archive into two parts:
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Navia Ang - 2019-11-25

after i created a.7z with LZMA2
and tried to recover bad.7z ( 1GB) its error
Cannot Open the files as archive
Headers Error
There is some data after the end of the payload data

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Igor Pavlov - 2019-11-25

Read
https://www.7-zip.org/recover.html
and try same actions as described there with same small files archives (less than 1 MB).

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