Using Windows 10 as a qcow2 image is the best way to run Microsoft’s OS on a Linux host without dual-booting. When properly configured, performance approaches near-bare metal, but there are specific trade-offs compared to using a raw disk image or VHDX.
If your Windows 10 qcow2 runs out of space:
qemu-img resize windows10.qcow2 +20G
Then, inside Windows 10, open Disk Management (diskmgmt.msc) and extend the C: partition.
Note: Shrinking a qcow2 online is not supported. Use the conversion method described earlier.
Date: 2026-04-18
Subject: Performance, compatibility, and best practices for Windows 10 on QCOW2 images.
# Take snapshot
virsh snapshot-create-as win10 --name "pre-update"
Place the qcow2 file on an SSD or NVMe drive. Spinning hard disks will bottleneck Windows 10’s random I/O, especially with snapshots.
The QCOW2 format is the native disk image type for KVM/QEMU virtualization. While Windows 10 does not natively boot from QCOW2 (it requires raw or VHDX for native boot), QCOW2 is the preferred format for hosted virtualization due to its thin provisioning, snapshots, and compression. This report covers optimal creation, driver integration (VirtIO), and performance tuning.
| Feature | Benefit for Windows 10 |
| :--- | :--- |
| Thin Provisioning | Allocates space only as the guest writes data. Reduces host storage waste. |
| Snapshots | Enables rollback after Windows Updates or driver installations. |
| Compression | Reduces storage footprint for idle Windows 10 VMs. |
| Backing Files | Allows a base Windows 10 image with per-VM differential overlays. |
| Performance | Slower than raw/block devices for high I/O loads (e.g., databases). |
Using Windows 10 as a qcow2 image is the best way to run Microsoft’s OS on a Linux host without dual-booting. When properly configured, performance approaches near-bare metal, but there are specific trade-offs compared to using a raw disk image or VHDX.
If your Windows 10 qcow2 runs out of space:
qemu-img resize windows10.qcow2 +20G
Then, inside Windows 10, open Disk Management (diskmgmt.msc) and extend the C: partition.
Note: Shrinking a qcow2 online is not supported. Use the conversion method described earlier.
Date: 2026-04-18
Subject: Performance, compatibility, and best practices for Windows 10 on QCOW2 images.
# Take snapshot
virsh snapshot-create-as win10 --name "pre-update"
Place the qcow2 file on an SSD or NVMe drive. Spinning hard disks will bottleneck Windows 10’s random I/O, especially with snapshots.
The QCOW2 format is the native disk image type for KVM/QEMU virtualization. While Windows 10 does not natively boot from QCOW2 (it requires raw or VHDX for native boot), QCOW2 is the preferred format for hosted virtualization due to its thin provisioning, snapshots, and compression. This report covers optimal creation, driver integration (VirtIO), and performance tuning.
| Feature | Benefit for Windows 10 |
| :--- | :--- |
| Thin Provisioning | Allocates space only as the guest writes data. Reduces host storage waste. |
| Snapshots | Enables rollback after Windows Updates or driver installations. |
| Compression | Reduces storage footprint for idle Windows 10 VMs. |
| Backing Files | Allows a base Windows 10 image with per-VM differential overlays. |
| Performance | Slower than raw/block devices for high I/O loads (e.g., databases). |
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