|Type of format||Disk image|
|Container for||File system|
You can download a few guest OS images from the QEMU website, including a simple 8MB image of a Linux distro. To run it, download and unzip the image in a folder and run the QEMU command.
qemu linux-0.2.imgReplace linux-0.2.img with the name of your guest OS image file. If it has a GUI and you want to use your mouse with it, double-click on the window and QEMU will grab your mouse. To make QEMU release your mouse again, hold down the Control and Alt keys simultaneously, then let go - your mouse will be released back to X.
Aurélien Jarno of Debian has prepared a number of pre-packaged Debian qemu images for several architectures, including ARM, Sparc, PowerPC, x86_64, and i386. They can be found at http://people.debian.org/~aurel32/qemu/