An attachment in Confluence is just a simple blob of data that can be downloaded as a file later.
Some of the code in Confluence has been written to read and interpret the content of these blobs - the MS Office macros in particular can reach into an attachment and pull data out to be displayed.
There are two things to consider with your question
- Confluence is not intended to be a file store, and a lot of installations struggle with large files because it's not designed for it. You may never be able to upload 650Mb of disc image.
- If you do manage to do it, you are going to need to find or write code that can read the image and show the information you want to see. I have dropped disc images on to Confluence servers before, so that files inside the image can be read, but I've done it by mounting the images as loopback devices in the OS, not via code in Confluence. I've not seen any macros or apps that would mount or read an image and allow you to get into it inside Confluence
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