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

[Chuck Guzis]

On 02/26/2015 01:29 PM, Eric Smith wrote:
> On Thu, Feb 26, 2015 at 2:21 PM, David Schmidt <david at attglobal.net> wrote:
>> I've never had luck reattaching the media to the hub when it becomes
>> detached.  (I've used a dab of thin but sticky glue.)  I chalked it up to
>> not being able to get the alignment perfect,
>
> That seems quite likely. The track pitch is less than 0.2 mm. A
> positioning error of less than 0.1 mm when reattaching the hub will
> render the disk unreadable.

It isn't particularly the track pitch that gets to be critical, but the 
radial positioning of the hub that defines the index position.  If you 
can read disks without relying on the index pulse, you may have better luck.

--Chuck