I did even more research here, here, and here. The bold emphasized text suggests that this is a binary image, about the same when reading a floppy disk in a PC with Linux with dd and writing the output into a file. The image is intended for use as a virtual hard disk by various Apple II and IIgs emulators (e.g. hdv- typically an image 800k (819,200 bytes) or greater in size in ProDOS order. 2mg is used with Emulators.) These usually have 819,200 Bytes. The Apple II Documentation Project has a number of Disk Images for download, most often in. I search for a way to create floppies to be used with that machine with help of an an older Mac: Both machines use the 800k GCR format.
I'm very seasoned with older Macs, but I have no experience within the Apple II world.
I recently acquired an Apple IIgs with two 3.5' floppy drives and no hard disk.
