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Windows 7: Compressing a 1Gb file into 4Mb file

25 May 2011   #1
dothackjhe

Windows 7 Ultimate x64 (desktop) / x64 (laptop)
 
 
Compressing a 1Gb file into 4Mb file

I've seen this a couple of times before where a file that is around 1 Gb or so could be compressed in rar to around a few Mb. How is this possible?


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25 May 2011   #2
zigzag3143

Win 8 Release candidate 8400
 
 

Quote   Quote: Originally Posted by dothackjhe View Post
I've seen this a couple of times before where a file that is around 1 Gb or so could be compressed in rar to around a few Mb. How is this possible?
Not usually possible as far as I know. If it were we would be using that algorithm.
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25 May 2011   #3
dothackjhe

Windows 7 Ultimate x64 (desktop) / x64 (laptop)
 
 

It's rarely that I see this though. If I remember it right, I first saw this kind of event in a GameCube ISO. It was around 1 Gb or so and was compressed to a few Mb only. And the same thing occurred when I downloaded an ISO of a PS2 DVD (CodeBreaker v10) when in fact I downloaded it as a few Mb only.
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25 May 2011   #4
pparks1

Windows 7 Ultimate x64
 
 

Well, if a file is comprised of a series of repeatable recognizable patterns, you could get tons of compression. For example, a file that is all 0's...from start to finish, is easy to zip to almost nothing as all that has to happen is that everything is replaced with 0's when extracted.
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26 May 2011   #5
dothackjhe

Windows 7 Ultimate x64 (desktop) / x64 (laptop)
 
 

Now I'm getting the idea. Admittedly I do not know how the algorithm works with this compression stuff aside from the fact that the files are being "compressed" to preserve the integrity of the files and save some disk space.
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26 May 2011   #6
profdlp

Main - Windows 7 Pro SP1 64-Bit; 2nd - Windows Server 2008 R2
 
 

Think of compression like a long driving trip. In places you might make a lot of turns, requiring a lot of directions like "turn left here, go two blocks, then turn right. Hard to compress. The example pparks1 gave would be like hitting the highway and only needing to know to stay on the road for the next 600 miles.

The first part might require a lot of data to get you just a few miles; the last part is one simple instruction for the next 600 miles.
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26 May 2011   #7
dothackjhe

Windows 7 Ultimate x64 (desktop) / x64 (laptop)
 
 

Thanks, great info.
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26 May 2011   #8
Gornot

Windows 7 Home Premium x64
 
 

Quote   Quote: Originally Posted by profdlp View Post
Think of compression like a long driving trip. In places you might make a lot of turns, requiring a lot of directions like "turn left here, go two blocks, then turn right. Hard to compress. The example pparks1 gave would be like hitting the highway and only needing to know to stay on the road for the next 600 miles.

The first part might require a lot of data to get you just a few miles; the last part is one simple instruction for the next 600 miles.
I don't think there is an easier example for this kind of explanation epic!
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26 May 2011   #9
MikeS104

Windows 7 Ultimate x64,Windows 7 Professional x64, Windows 7 Enterprise x64
 
 

With WinRAR or 7Zip you can make a set of 4MB files.
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26 May 2011   #10
WebMattR

W7 Professional x64
 
 

Another option is one not many people seem to think of, and that's UHARC. I've never found anything that compresses files so well.

WinUHA Website
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 Compressing a 1Gb file into 4Mb file




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