Inside the XP VM, zero out free space (e.g., using sdelete -z), then:
qemu-img convert -O qcow2 windows-xp.qcow2 windows-xp-shrunk.qcow2
For the uninitiated, Qcow2 is the disk format used by QEMU and many virtualization platforms (Proxmox, virt-manager). It stands for QEMU Copy-On-Write version 2. Unlike a raw disk image, Qcow2 is:
| Tweak | Why |
|-------|-----|
| Use cache=writeback or none | Faster I/O (trade safety for speed) |
| Set aio=native (QEMU 6.0+) | Better async I/O on Linux |
| Use raw for maximum speed | Convert to raw if snapshots not needed: qemu-img convert -O raw xp.qcow2 xp.raw |
| Disable XP disk indexing | Reduces random writes inside guest |
| Align partition to 4K | Modern storage performance |
Example high-performance launch:
qemu-system-x86_64 -accel kvm -cpu host -smp 2 -m 2048 \
-drive file=windows-xp.qcow2,if=ide,cache=writeback,aio=native \
-net nic,model=rtl8139 -net user
# From VMDK (VMware), VDI (VirtualBox), raw, etc.
qemu-img convert -f vmdk -O qcow2 source.vmdk target.qcow2
Proceed through the standard Windows XP installation process. Once you reach the desktop:
To run Windows XP using a qcow2 disk image, you'll typically use QEMU or KVM on Linux, or virtualization managers like Proxmox and UTM. 1. Creating the qcow2 Disk Image
First, you need to create a virtual hard drive file. The qcow2 format is preferred over "raw" because it supports compression and only grows as you add data. Run this command in your terminal: qemu-img create -f qcow2 winxp.qcow2 10G Use code with caution. Copied to clipboard -f qcow2: Specifies the format. windows xpqcow2
10G: Sets the maximum size (XP requires at least 1.5GB but 10GB–32GB is recommended for smooth use). 2. Launching the Installation
To boot from a Windows XP ISO and install it onto your new qcow2 image, use a command like this:
qemu-system-i386 -m 512 -hda winxp.qcow2 -cdrom windows_xp.iso -boot d Use code with caution. Copied to clipboard -m 512: Allocates 512MB of RAM (ideal for XP 32-bit). -boot d: Tells the VM to boot from the CD-ROM first. 3. Performance Tips
VirtIO Drivers: For better disk and network performance in environments like Proxmox, use virtio as the bus type. Note that you will need to mount a VirtIO driver ISO during setup so XP can "see" the drive.
CPU Allocation: Use 1 or 2 cores; giving XP more than 4 cores can sometimes cause stability issues.
Graphics: If you're using a GUI manager like VMLauncher or UTM, ensure you enable mouse pointer integration and adjust screen resolution after installation. 4. Where to Find ISOs Inside the XP VM, zero out free space (e
Shared folder not working with WinXP guest · utmapp UTM - GitHub
Headline: 💻 The Sweet Sound of Startup: Windows XP in a QCOW2 Package
There is something oddly satisfying about virtualizing the OS that defined an era. I finally got around to converting my old Windows XP disk image into a QCOW2 format for my QEMU/KVM setup, and it’s been a trip down memory lane.
Why QCOW2? Besides the fact that it saves a massive amount of space with thin provisioning (a fresh install is tiny compared to a raw image), the snapshot capabilities are a lifesaver. One click and I’m back to a clean desktop before I accidentally installed that sketchy shareware app. 😅
The Setup:
It’s amazing how fast this 22-year-old OS runs on modern hardware. No drivers to hunt down (mostly), and the UI is peak early-2000s aesthetic. For the uninitiated, Qcow2 is the disk format
Anyone else still spinning up an XP VM for retro gaming or just to stare at the "Bliss" wallpaper? Let me know your go-to settings!
#Virtualization #WindowsXP #QEMU #QCOW2 #RetroTech #Sysadmin #Nostalgia
Windows XP QCOW2 refers to a virtual disk image of the Windows XP operating system specifically formatted for use with the emulator or (Kernel-based Virtual Machine) hypervisor. Key Features of the QCOW2 Format Thin Provisioning: Unlike "raw" images, a
file only takes up as much space on your physical drive as is actually used by the virtual machine. Snapshots:
You can save the "state" of your XP installation and roll back to it instantly if something breaks. Copy-on-Write (COW):
This allows multiple virtual machines to share the same base "gold" image while saving their unique changes to separate, smaller files. Common Uses
If using virt-manager, ensure the disk section uses:
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='writeback' io='native'/>
<source file='/var/lib/libvirt/images/winxp.qcow2'/>
<target dev='hda' bus='ide'/>
</disk>
Use
bus='sata'orvirtioif you pre-load XP with drivers.