Solved Win 11 clean-install size compared to Win 10 - why is a 64GB install partition required?

mingle

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Hi Guys,

Just installed Win 11 (as a virtual machine - real PC coming up soon!) and despite one of the requirements being 64GB of free-space, after install (before any cleaning-up or housekeeping), it's only used 18.5GB.

If I recall correctly, a clean Windows 10 install is not much less that that (around 17GB?).

Why such a large free disk-space requirement then?

I'm quite miserly when it comes to the size of my system partition - all of my current systems have a 40GB install partition and none of them have ever been more than 60% full even after installing all apps and regular updates.

Has anyone else tried installing with a less free space on the install partition?

Cheers,

Mike.

P.S. I must say I really like the initial 'look-and-feel' of Windows 11...
 

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FreeBooter

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The 64GB of storage will not be used by Windows 11 it will be used by installed applications and Windows updates.
 

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Mystere

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In order to do a full update, you need enough space for 1) your current os, 2) the downloaded files, 3) the downloaded files processed, 4) the processed files extracted into a folder, 5) your old os to be copied to a backup folder so it can be rolled back if necessary, 6) the new OS.

On top of that, you also need space for swapfile and hiberfile (depends on memory). All that adds up
 

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mingle

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Yep, understood.

I've now performed a clean-install on one of my 'real' PCs and curiously the size on disk is 24.5GB, compared to a mere 18.5 when install as a VM...

Seems a bit strange...
 
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cereberus

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Yep, understood.

I've now performed a clean-install on one of my 'real' PCs and curiously the size on disk is 245.GB, compared to a mere 18.5 when install as a VM...

Seems a bit strange...
Something has gone wonky. Use Treesize (in MS Store) to work out why the space is being used.
 

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Mystere

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Yep, understood.

I've now performed a clean-install on one of my 'real' PCs and curiously the size on disk is 245.GB, compared to a mere 18.5 when install as a VM...

Seems a bit strange...
Depends on how you measure it. you need a tool that understands hard links. Something like WinDirStat should show you the real results.
 

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hsehestedt

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Be aware that there is also a small architectural change. Windows now reserves a certain amount of space for future upgrades to guarantee sufficient space to perform a major feature upgrade. If I can find the details I'll post a link here. The details are a little fuzzy in my mind at the moment and I'm going to be away for a bit so apologies if this sounds like a bit of a rushed response (it is!).
 

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mingle

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Thanks for the replies fellas...

When doing the clean install on a real PC, it actually said I need 52GB free space...

Maybe it's just how the install ISO is 'feeling' on any particular day!

Cheers,

Mike.
 

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bobkn

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Yep, understood.

I've now performed a clean-install on one of my 'real' PCs and curiously the size on disk is 245.GB, compared to a mere 18.5 when install as a VM...

Seems a bit strange...
I wonder what you have there?

My Windows folder uses about 20GB. I have about 150GB total used in the boot partition, but a lot of that is data (which I should have organized better).
 

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zbook

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See these links for the 64 GB requirement:




Storage: 64 GB* or greater available storage is required to install Windows 11.


Code:
To install or upgrade to Windows 11, devices must meet the following minimum hardware requirements:

Processor: 1 gigahertz (GHz) or faster with two or more cores on a compatible 64-bit processor or system on a chip (SoC).
RAM: 4 gigabytes (GB) or greater.
Storage: 64 GB* or greater available storage is required to install Windows 11.
Additional storage space might be required to download updates and enable specific features.
Graphics card: Compatible with DirectX 12 or later, with a WDDM 2.0 driver.
System firmware: UEFI, Secure Boot capable.
TPM: Trusted Platform Module (TPM) version 2.0.
Display: High definition (720p) display, 9" or greater monitor, 8 bits per color channel.
Internet connection: Internet connectivity is necessary to perform updates, and to download and use some features.
Windows 11 Home edition requires an Internet connection and a Microsoft Account to complete device setup on first use.






Storage: 64 GB or greater

Code:
The following configuration requirements apply to VMs running Windows 11.

Generation: 2 *
Storage: 64 GB or greater
Security: Secure Boot capable, virtual TPM enabled
Memory: 4 GB or greater
Processor: 2 or more virtual processors







Code:
More information on storage space requirements to keep Windows 11 up-to-date

The size of the Windows operating system that comes with your device and the amount of free storage
space needed to download and install Windows updates are highly variable as they depend on a variety
of factors.

The factors that impact the amount of free space needed to take an update include:

the versions of Windows previously installed on the machine;

the amount of free storage space available from Windows files to reuse,

such as the virtual memory pagefile or hibernation file;

which applications are installed on your device;

and how those applications store data.

When updating, Windows will attempt to free up enough space automatically and
to guide you through freeing up even more if the automatic cleanup is not sufficient.

You can also take steps on your own to free up space.
 
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