8/27/2013

Windows 8 disk space usage vs Windows 7

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The official Microsoft Windows 8 (64 bit) disk space requirements are the same as Windows 7: 20 GB.
In actual practice, how does Win 8's disk space usage compare to Win 7's? Specifically, how does disk space usage compare after a clean install of each? I'm thinking the new Metro stuff must take additional space, but MS could have slimmed down the rest of Windows at the same time.
The answer is as follow :
To try and make a fair comparison, I went for Windows 7 Ultimate SP1 versus Windows 8 Enterprise. Both editions were 64-bit. These are the most full-featured editions of the respective operating systems available, so could be considered as a "worst-case scenario". SP-1 was already slipstreamed into the Windows 7 Ultimate ISO, as supplied by Microsoft via TechNet.
The test consisted of two identically specified Virtual Machines running on Hyper-V - 1024MB of RAMwas specified, and no network adapter was connected (to avoid auto-activation or any automatic updates). The systems were each installed onto newly created VHDs, the default options were chosen, and the first user account was created by setup (named Fred, both times if you're interested). As soon as it reached the desktop, the system was immediately shut down.

The Results

The VHD's were mounted as read-only into my main OS, and the properties for each were brought up.

Windows 7 Ultimate SP1:

Windows 7 Ultimate SP1

Windows 8 Enterprise:

Windows 8 Enterprise

The Conclusion

Windows 8 Enterprise takes 3.38% more space than Windows 7 Ultimate SP-1.

Other Interesting Points To Note

On a blank hard disk, Windows 7 will create a System Reserved partition of 100MB, whereas Windows 8 will make it 350MB:
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WinDirStat from the host computer onto the mounted VHD's gives the following output (drive F is Windows 7, H is Windows 8):
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WinDirStat run on the Windows 7 VM gives:
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WinDirStat run on the Windows 8 VM gives:
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