[Coco] So, does anyone know where to get disk drives?

[Retro Canada]

only quad density drives using quad density medias can format in 720k.

this drive will format in 360k when jumpered to 300k

On 2013-09-01, at 10:10 PM, Joel Ewy <jcewy at swbell.net> wrote:

On 08/29/2013 01:04 AM, Mike Pepe wrote:
> (most) 1.2MB PC drives are useless- they spin at a different rate.
> 
> Aside from the complications of building the cable with the proper twist and
> connectors, the 3.5" works great. In a pinch you can use high density disks
> and cover up the HD hole, but I wouldn't trust it with anything I cared
> about.
> 
> 
> ...[snip]

I do have a number of Teac FD-55GFR drives, which are 1.2M 5.25" drives that can be jumpered for a 300 RPM spindle speed.  These could be used with DD media and formatted to 720K in OS-9.  In this case you don't have the magnetic coercivity issue that you get with trying to format HD media to low density.  What I've read suggests that the only difference between the double density and quad density disks is that the QD media have been certified (tested) to work at a track density of 96tpi.  Maybe I'll experiment with this and see how well it works on a CoCo.

JCE


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