I downloaded the latest Raspbian image from the raspberrypi.org website on my Mac running OS X 10.10.5 The SHA-1 checksum agrees with that listed on the website.

When I try to extract using unzip I get the following error

warning [2015-09-24-raspbian-jessie.zip]:  76 extra bytes at beginning or within zipfile
  (attempting to process anyway)
error [2015-09-24-raspbian-jessie.zip]:  reported length of central directory is
  -76 bytes too long (Atari STZip zipfile?  J.H.Holm ZIPSPLIT 1.1
  zipfile?).  Compensating...
   skipping: 2015-09-24-raspbian-jessie.img  need PK compat. v4.5 (can do v2.1)

note:  didn't find end-of-central-dir signature at end of central dir.
  (please check that you have transferred or created the zipfile in the
  appropriate BINARY mode and that you have compiled UnZip properly)

5 Answers 5


I managed to unzip it with tar.

tar xzvf 2015-09-24-raspbian-jessie.zip

Requires no installation of additional software

  • 1
    Magic! The 'z' is not needed tar -xvf 2015-09-24-raspbian-jessie.zip
    – Milliways
    Oct 6, 2015 at 3:45

The ZIP file can also be uncompressed using ditto, no software installation needed:

ditto -x -k 2015-09-24-raspbian-jessie.zip .

Worked for me.


You can use 7za from p7zip installed from brew:

brew install p7zip

and then unzip using the command

 7za x big_file.zip

This is apparently a known "bug" in OS X Archiver, which is unable to handle zip greater than 4 GB.

  • yeah archiver seems to create .cpgz file out of it (i.e. "corrupted zip rezipped" file or some odd). And the "unzip" command line also doesn't work on it, but the other answers here seemed to work fine. Weird. (apparently some larger files are "zip64" format?) stackoverflow.com/questions/32439742/…
    – rogerdpack
    Nov 23, 2015 at 16:17

I tried the command line solutions listed here to a 18GB zip to no avail. I was able to extract the problematic zips using:

The Unarchiver

Free software available through the app store.

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