[SATLUG] [OT] Apple dmg's compressible?

[Brad Knowles]

At 11:16 AM -0600 2/9/07, Bob Tracy quoted Jeremy Mann:

>>  Bob, the DMG file is already compressed. Once you "open" the DMG for
>>  the Xcode tools it comes out to about 1.5 gigs. You could try using
>>  Stuffit to see if it will compress more, but doubtful.
>
>  That's what I was afraid of, but if I had thought about it for two
>  seconds I would have guessed the images were already compressed.

Not all .dmg files are compressed.  Some are compressed 
after-the-fact using tools like StuffIt.

However, regardless of how else it may be compressed, you may be able 
to get further compression by using a better compression program -- 
like bzip.  I've seen bzip get a compression ratio of 9-10x in cases 
where every other compression program I've used can't get any better 
than 2.5-3x, so you might want to give it a try.

It may not be installed on your box, but if so then it shouldn't be 
hard to download, even if you have to download the source code and 
build it on one system and then copy the binaries with the compressed 
.dmg file.

-- 
Brad Knowles <brad at shub-internet.org>, Consultant & Author
Co-author of SAGE Booklet #15 "Internet Postmaster: Duties and 
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