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So when I use the list flag of gzip the uncompressed size is listed as 3.5g (with ratio of -9.0%):

$ gzip -l piTorrentbox101216.gz
    compressed        uncompressed  ratio uncompressed_name
     3843992911          3527409664  -9.0% piTorrentbox101216

But when I decompress the file I get an even bigger filesize than listed in the last command:

$ ls -l 
   7822376960 jan 26 13:02 piTorrentbox101216

I also tried decompressing using 7zip but it gives me this output:

$ 7z x piTorrentbox101216.gz

7-Zip [64] 9.20  Copyright (c) 1999-2010 Igor Pavlov  2010-11-18
p7zip Version 9.20 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,4 CPUs)

Processing archive: piTorrentbox101216.gz

Extracting  piTorrentbox101216
ERROR: E_FAIL 

I want to burn this backed up image to my raspberrypi brand new SD card (which is 7.7g). I have already burned this image to an old card that was also 7.7g and it worked fine every time but now that the old SD is broken I had to buy a new one.

So, why is it that gzip unzips more than it should? And how can I fix it?

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gzip isn't extracting more than it should, you've just hit the 32-bit limit on the size field, so gzip -l can't give the correct result, but the extraction can.

You may find Fastest way of working out uncompressed size of large GZIPPED file relevant!

  • But i'm still confused because I have burned that same image into a 7.7gb SD card (exactly the same size as this one and both are kingston). I don't understand what is wrong with this one. – medicengonzo Jan 27 '17 at 5:18
  • The extracted image is 7.2GiB in size, so there shouldn't be any problem writing it to your SD card. – Stephen Kitt Jan 27 '17 at 6:08

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