i downloaded the beta4 gz file and extracted the img file from it using winrar.
This is what I expected to do but the downloaded file was already 500MB as if WinRAR had automatically extracted it. I did not ask WinRAR to extract the file.
The question is: can I assume that the 500MB file is the .img file? I suppose I just have to try it and see. This is why I asked if the size is correct: 512,483,328 bytes?
Thanks for the physdiskwrite tip,