Title: Building a Custom Disk Image Describe the issue: The title makes it sound like the content will be about building disk images. However, disk images are not mentioned. This seems to be a bit more accurate: "Oz is also useful for building virtual machine images that can be uploaded to the Image service and used to launch virtual machine instances." Suggestions for improvement: Suggest re-titling as "Building a Custom Virtual Machine Image", as that seems to more accurately describe the content.