But, also just like a regular disk, there's a device file (of the form /dev/diskN where N is an integer starting from 0) created for the disk. Then it shows up in the Finder just like a regular disk, as we all know. In order to manipulate its contents, it's convenient to have the OS "attach" it as if it were a real disk, most easily accomplished by double-clicking it as usual. View image here: -Ī disk image consists of at least the contents of the disk it's representing (perhaps compressed and/or encrypted, or otherwise modified), and frequently also headers with some metadata. There are probably third-party tools to make this easy, but we learn more this way. So you're saying there's no format difference between OS X DMGs and the image format VirtualBox is looking for? Or is there? What is dd doing in that case? And how would that even work? What is /dev/disk2? I don't have floppies, if that's what you're shooting for.
img is actually the extension that VirtualBox is looking for, and it may be disk1 or disk3 or whatever in your case. But what I meant was, sudo dd if=/dev/disk2 of=foo.img although I don't know if. Well I'm not promising this will work, since I haven't tried it myself. dmgs as usable floppy images and I had to tell it to search for all file types. Then use dd from the device where the image is attached (/dev/disk2 or whatever). Mount the disk image and copy your stuff onto it.
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