[Coco] CoCoSDC question: default .DSK size?

[Allen Huffman]

> On Dec 17, 2014, at 12:46 PM, Darren A <mechacoco at gmail.com> wrote:
>> Does "NEW" create a 35 track image by default, or worst-case 80 track
>> (wasting space)? Or does it have nothing in it until something is written
>> and it expands to that size?
>> 
>> 
> 
> There is no way to create a 42 track single-side image directly on the
> CoCo. You will need a customized image file containing a JVC header.

Thanks, Darren.

> The customized DSK image will auto-expand to 42 tracks (or more) when
> needed. The 2 byte header will prevent the CoCo SDC from thinking these are
> double-sided floppy images.

I see -- CoCoSDC uses this header to know how big the disk is.  What is in that header when I use ",NEW" to make a new disk image from CoCoSDC DOS?

		-- Allen