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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

iMac - Help? File Compression not working?


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wandah

 
Member Since: May 30, 2009
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Hello forum!

(I apologize if I'm not posting in the correct thread!)

When I right-click on a file to compress, I have the options to compress, but not to "archive." So this could be the source of my problem . . .

* After a file is zipped, it's hardly smaller at all. Example, I just compressed a file which was 247.1 MB before and 235.6 MB after.

Any clues to what I need to do to fix this?

Thanks so much in advance.

Wanda
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wandah

 
Member Since: May 30, 2009
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Eek, sorry, I guess this is a software problem?? I'm so sorry . . . can't find the delete or move button.

Please, don't hurt me.
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chscag

 
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Some files are already in a compressed format and therefore will not compress any further. You didn't say which type of files you're trying to compress?

Generally, text files will compress very well while certain graphic or sound files will not. (MP3, JPEG, etc.)

Regards.
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vansmith

 
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Zip compression may not compress something very much at all. In fact, zip compression is horrible IMHO.

If you are really looking into saving some space or compress something well, you may want to look into something like gunzip or better yet, bunzip2. You may not notice any difference with either of these but it's worth a shot.

Open up a terminal window (/Application/Utilities/Terminal.app) and type the following to create what is called a "tarred bunzip2 archive":
Code:
tar -cjf name_of_archive.tar.bz2 /directory/here/
Replace name_of_archive with the name of the archive you want to create and replace /directory/here/ with the path to the folder you want to archive. So, for instance, if you want to archive the folder ~/Documents/Work (~ = home directory, it's a shortcut) and wanted to create an archive called work, you would execute the following:
Code:
tar -cjf work.tar.bz2 ~/Documents/Work/
Again, I can't guarantee you will see much of a difference but sometimes the difference can be quite noticeable.

Note: If you are looking to send this to someone using Windows, they will have to install extra software. You, on the other hand, can decompress it simply by double-clicking it as Finder has support for decompression of tarred bunzip2 archives.

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wandah

 
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Ah! Yes, it's an audio book file (.mp3) that I'm trying to compress. I had no idea that this could be normal.

Thanks for your help!

Wanda
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