[Coco] The .DSK format/structure

[Robert Gault]

tim at franklinlabs.com wrote:
> For the most part, the DSK image is just that. An image. There's no specific
> format for a DSK file. A floppy diskette or hard drive is divided into sectors.
> These sectors are either 256 or 512 bytes in length. The CoCo is 256 bytes. the
> sector length is determined by the original operating system used. These sectors
> are save in a DSK file as raw data. The format is determined by the drive
> emulation software being used.
>
>

That's true if the disk is single sided. For the Coco emulators, double sided 
disk images alternate tracks from what was the original disk's sides. So the 
front side tracks are all "even" and the back side tracks are all "odd" on the 
image.
That's why the kernel on a double sided OS-9 disk image is not where you might 
think it should be.

Robert