Litigation Support Tip of the Night

November 20, 2019

Data may be transferred in split files, which will commonly have the extension .bin or simply .001, .002, .003, etc..   These files can be re-combined into the .RAR format, a common archive format similar to .zip.   You can use a command in DOS to recombine these binary files into a single .RAR file that can be opened.   

copy /b splitfile1.bin + spiltfile2.bin "2019LItSupport.rar"

Two files, 'splitfile1.bin' and 'splitfile2.bin' from separate discs or downloads, become a single rar file that can be opened in WinRAR or 7-zip.     

7-zip also contains a utility to re-combine split files but WinRAR does not. 

July 23, 2019

When opening a compressed file with the extension zip using WinZip you may encounter the following error:

The full error will read in detailed diagnostics, "Central and local directory mismatch for file "acmeco/" (compressed size - local: 4294967295  central: 0). Severe Error:  Local and central compressed size values don't match.".    

A zip file is structured to have file headers preceding each file entry, followed at the end by a central directory.   The central directory lists the file entries and associated metadata, keeping track of each file's location.   Each file header must be matched by a central directory header.   The central directory allows for a list of the files to be generated very quickly after the compressed file is opened, without the need for the software to read each actual file.

I was able to get around this problem and successfully unzip by opening the zip file in Windows Explorer rather than WinZip.  Simply right click on the file and choose the option to open it with Windows Explorer.

Hard to say what's going on but it looks like Windows Explorer can keep track of the file header information in a way WinZip 16.5 can't. 

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Sean O'Shea has more than 15 years of experience in the litigation support field with major law firms in New York and San Francisco.   He is an ACEDS Certified eDiscovery Specialist and a Relativity Certified Administrator.

The views expressed in this blog are those of the owner and do not reflect the views or opinions of the owner’s employer.

 

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This policy is subject to change at any time.

 

Contact Me With Your Litigation Support Questions:

seankevinoshea@hotmail.com

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