[Coco] Another Coco Virtual Disk Util

[Robert Gault]

Walt Zydhek wrote:
> Ok, I have added support for $82 in DD.FMT. New VHD images will be created
> with $82 in DD.FMT. When opening a VHD, if $82 is in DD.FMT, 1 head will be
> used. Otherwise it will use DD.FMT to determine 1 or 2 heads. I Have a few
> CHDs that were created with 2 heads so opening them as 1 head causes a
> failure to load. So OS9 does not support multiple head hard drives? They
> stick to a single head of the drive?
>
> -Walt Zydhek

OS-9/NitrOS-9 supports however many heads are on a real hardware drive. The .vhd 
emulated hard drive was designed as a single head drive.