How to increase virtual disk size in your VM platform Read the entire guide before performing any of these steps on your system. Additional directions are also available for users of VirtualBox. This guide is principally for users of Windows 10 using a QEMU+KVM virtual machine, managed either with Boxes or VMM. Rather than destroying the existing VM to expand the disk to allow for the installation, users can-with some manual effort-expand the existing disk image used with Windows 10 in a VM. SEE: 20 quick Windows tips for power users (free PDF) (TechRepublic)

(Windows Update does not verify that sufficient disk space exists before starting the update.) Without an ample amount of free space available when the update is started, updating to Windows will fail, often displaying error code 0x80070070. Likewise, Linux users who utilized a Windows 10 license bundled with their laptop or desktop by installing Windows 10 in a virtual machine are also likely to be troubled by this update, unless they allocated a large amount of disk space on initial setup. This has caused significant pain for users of Windows 10 on low-end systems with a 32 or 64 GB eMMC SSD, as those systems may not be able to upgrade without installing a new SSD-if the system supports it. To install the upcoming Windows update, Windows requires 32 GB of free space, an increase from the (frankly, paltry) 16 GB needed for 32-bit versions and the 20 GB needed for the 64-bit versions.

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