With this two links you have access to loads of virtual machines (most of them are GNU/Linux) that you can download for free and can save you the pain of downloading an ISO, burning it, reboot, install, etc.
Don’t forget to say thanks to the webmasters 😉
If you’re interested in the file format of the VirtualBox VMs, you definitly should read this thread on the forums which explains a lot of interesting things about this disk image format and how you can make the most of it. For example, it answers questions like:
- So how are virtual bytes in my Virtual HDD mapped into physical bytes in my VDI?
- So what about snapshots. How do they work?
- Why do dynamic VDIs grow far more than the used space?
- How can I reduce the size of a dynamic VDI on disk?
- How do I get the best performance out of my VDIs?
- Where is the best place to keep my VDIs?
- How do I backup my VDIs?