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

Chuck Guzis cclist at sydex.com
Sat Feb 28 11:57:45 CST 2015

On 02/28/2015 01:05 AM, Eric Smith wrote:

> Having looked at the necessay geometey, I'll believe that data recovery by
> reattaching the hub of a 3.5" floppy is practical only when someone has
> succeeded doing it to multiple disks, and then I'll want to know how many
> attempts per disk it took, how much time per attempt, amd what (if any)
> special apparatus was used.

Without attempting this yourself and relating your own experience, how 
can you verify this belief?

I've examined the separated parts of a 3.5" cookie and two things are 
immediately apparent to me.  The first is that the metal hub's profile 
is not straight-edged, but conical, so any re-attachment would be 
self-centering.  The second is that the residue of the adhesive used to 
attach the media to the hub is quite visible, so you do have a 
positioning guide.

In any case, if done carefully, and preferably with another hub that has 
the mirror profile of the first, I don't imagine any placement error 
should be worse than that of the square spindle hole in the hub itself.

Since you require proof of "several" 3.5" attempts being successful, 
I'll attempt this when there's money involved for my time.

Until then, we're both only speculating.  If I attempt to demonstrate my 
assertion and succeed, I'm getting the feeling that you'll still be an 

Did the forensics community or the NML ever comment on the subject?


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