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

30 May 2011   #21


there are also different grades of compression apps out there and algorithms in use. I've come across one not readily available to the general public that really is good on complex files but costs alot to get.

frankly you really do get what you pay for on this right now as the development has to be paid for somewhere.

i dare say the compression used on things like the game discs is probably a little bit beyond anything capable by winzip/winrar/7zip.

My System SpecsSystem Spec
30 May 2011   #22
Microsoft MVP

Windows 7 Ultimate X64 SP1

The Windows 7 install DVD is about 4GB in size and has all versions included. After you install one OS it's size is over 8GB. Somehow MS has compression figured out. May have something to do with all the .bin files?
My System SpecsSystem Spec
31 May 2011   #23

Windows 10 Pro x64 x2 Windows 10 Enterprise x64, Ubuntu

Due to the nested nature of Windows 7 and the in-place "Anytime" upgrade options available, the install is actually always the same - the image for Ultimate is used for installation but only those options relevant to the licence are activated.

this gives the impression of all versions being on the same disk when in fact a single image is present, giving a compression ratio of about 2:1
My System SpecsSystem Spec

31 May 2011   #24

Windows 7 x64 pro/ Windows 7 x86 Pro/ XP SP3 x86

Win7 employs the WIM image format which enables compression and "single instancing", thereby reducing the size of image files significantly. Single instancing means that if e.g. images 1, 2, and 3 all contain file A, only a single copy of the file A is stored and images 1, 2, and 3 are pointed to that copy.
My System SpecsSystem Spec

 Compressing a 1Gb file into 4Mb file

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