3.5" floppy failure mode? Hub not attched to media.

Chuck Guzis cclist at sydex.com
Fri Feb 27 11:05:11 CST 2015

On 02/27/2015 06:17 AM, John Foust wrote:
> At 06:45 PM 2/26/2015, you wrote:

> You're not concerned about the tolerance and re-centering issues?
> You think the cookie will fit back on the hub precisely enough
> that it'll be aligned with where tracks were before?

Not so  much.  A 3.5" floppy is recorded at 135 tpi, where an 
80-cylinder 5.25" floppy at 96 tpi.  On 5.25" Drivetec floppies, the 
cylinder density is double that--192 tpi.

Now consider the hub-clamp mechanism of a 5.25" drive.  I suspect that 
with a bit of care, one can probably get things right most of the time.


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