New Windows 8.1 Update Installation Process Will Save Few GBs Of Device Storage For Consumers

Windows WIM Boot


Microsoft today revealed a new installation process in which Windows can be installed to save storage on the disk. This new instillation process was added with Windows 8.1 Update and it allows devices with 16GB or 32GB SSDs or eMMC storage to have plenty of storage left for apps and data after Windows is installed.

This new deployment option is called Windows Image Boot (or WIMBoot).

Instead of extracting all the individual Windows files from an image (WIM) file, they remain compressed in the WIM. But from the user’s perspective, nothing looks any different: You still see a C: volume containing Windows, your apps, and all of your data.

How much does this process save on storage?

So let’s assume the WIM file (INSTALL.WIM) is around 3GB and you are using a 16GB SSD. In that configuration, you’ll still be left with over 12GB of free disk space (after subtracting out the size of the WIM and a little bit of additional “overhead”). And the same WIM file (which is read-only, never being changed in this process) can also be used as a recovery image, in case you want to reset the computer back to its original state.

How does that compare to a non-WIMBoot configuration? Well, on that same 16GB system there might be only 7GB free after installing Windows – and then only if you don’t set up a separate recovery image.

How to try this out yourself?

The basic steps:

Make sure you understand the requirements and pre-requisites for doing this, as discussed at

You can read about how this new installation process works and other details from the link below.

Source: Windows Team Blog

  • donzebe

    This is really good for all the smaller devices that will be coming out, since most will have 32 Gb storage

  • GG002

    Awesome with full Windows 8.1 taking up less space than both Android and iOS, while being 1000x more capable.

    • Michael Fernandez

      Exactly… And now with Windows Free for less than 9″ devices… Really looking forward to tablets priced at par with Android beating it in every aspect… Go Windows Go !!!… Hope all saw the Interactive Live tiles Demo in separate post.. Wooow.. Windows rocks….

  • Dome

    STUNNING!!!!!! Great job!!! Hope every new device will use this process.

  • Doron

    how do I do this? it looks hard…
    i have a asus transformer with a full windows 8.1 with the update what step do i need to take for the storge

    • Giphi

      I have a Lenovo Mix2. I wish manufacturers give an option/tool to choose WIM boot (after reset to factory settings)