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Compressible vs Incomressible data. What is it?

post #1 of 2
Thread Starter 
I know that movies, pictures, mp3's etc are incompressible. Some other filetypes - too.

In the past few days I've found chart which demonstrated Crucial M4 and Sandforce-based SSD's perfomance relatively to data compression capabilities (0-100% compressible).

I've tried to compress game folder with normal compression level in WinRar ~60% compression rate. But it took 10+minutes on my i7-2630QM (4% usage) & notebook HDD to compress 7.94GB folder (50k files). I don't think that Sandforce controller uses similar compression level.

Tried Fastest compression ~ 70% and 5-7minutes. Same conclusion.

So how i can measure this value (compression capabilities) for any data on my hdd?)
Edited by Bick - 2/29/12 at 4:12am
post #2 of 2
MP3 isn't compressible, because it's already compressed.
It's not easy to work out how compressible data is without compressing it and comparing the file sizes. To be honest, I doubt it'd be worth the huge amount of time it would take, and the Sandforce controller does use a similar compression level, but as it's being run through a dedicated hardware compression processor, it's vastly quicker than using the CPU, quick enough that it does it on the fly while reading the drive.
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