If you have a device below 32GB in storage, we don’t recommend dual-booting Windows 10 and Console OS with Android. Here’s why.
Let’s say you have a 16GB tablet. Even if you devote 4GB to Android, Windows 10 no longer has enough free disk space to accommodate installing (the larger payloads) of major Windows 10 updates.
Microsoft does offer you the ability to plug in a flash drive, to offload the major update’s size. However, you still need 3-4GB of free disk space on a Windows tablet to facilitate the upgrade - even when connecting a flash drive.
The result of this change by Microsoft, in how Windows is updated, means it no longer is viable to dual-boot on tablets and PCs with less than 24GB of primary storage space.
For example, in our testing, we took a 16GB tablet and installed Windows 10 on it, then resized Windows to 12GB, freeing up 3.5GB for Console OS. While we were able to install both OSes side-by-side successfully - and installed apps to the microSD card storage, Windows 10 refused to install its "Threshold 2" or "TH2" major upgrade - noting that even with a flash drive connected, there was not enough space on the Windows partition.
If you do choose to run Console OS Lollipop alongside Windows, with below 32GB of storage, please note that it is not supported. We strongly encourage you to stay at Windows 8.1, if you choose to do so. You will have a much better experience by dedicating a sub-32GB tablet to Console OS with Android, and erasing Windows completely.
We cannot officially support Windows 8.1 going forward, because of its use of so-called WIMBoot technology - which is drastically different than the partitioning of Windows 10. Unfortunately, we only have so many resources, and we have to focus on the state of the PC today - not in the past.
That said, you probably will have no problem running Windows 8.1 (even if your tablet employs WIMBoot) for the foreseeable future.
Important: If you have a Windows 8.1 tablet with WIMBoot - erasing all partitions may prevent you from reinstalling Windows, even with a user-created Windows recovery drive. Upgrading to Windows 10 Home locks in your free license, and you can then reinstall Windows 10 at any time. If you choose to dedicate your Windows tablet to Console OS with Android, we strongly encourage you to upgrade to Windows 10 Home first - this preserves your Windows 10 license for the life of the device, should you ever choose to switch back to Windows.
Doing this later may require you to purchase a Windows recovery drive your PC maker, and Microsoft has said that Windows 10 Home upgrades may no longer be free after the first year.