Why do good floppy disks go bad?
Tom Gardner
t.gardner at computer.org
Fri Apr 8 14:11:04 CDT 2016
Sorry, to a EE they are all epoxies, but:
"BINDER: A polymer such as polyester-polyurethane used to bind magnetic
particles together and adhere them to the base film in the manufacturing of
magnetic media."
http://www.fujifilmusa.com/shared/bin/Magnetic_Media_Terminology.pdf
"Polyester polyurethane is the workhorse of polyurethane films. It offers
excellent strength and long-term stability"
http://www.apiusa.com/polyesterpolyure.html
I think properly cured all binders used are pretty stable.
Tom
-----Original Message-----
From: Chuck Guzis [mailto:cclist at sydex.com]
Sent: Thursday, April 07, 2016 10:47 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Why do good floppy disks go bad?
On 04/07/2016 10:06 PM, Tom Gardner wrote:
> And it's not likely the binder, fully cured epoxies are also very
> stable. Note disks do not have the tension problem that tape has.
There, I have to respectfully disagree. Floppy disks do not use an epoxy
binder, but usually a polyurethane-based one. (Most are proprietary
formulations). Hard disk coatings usually use an epoxy-phenolic binder, but
they're not on a flexible substrate.
Polyurethane isn't forever and tends to be somewhat hygroscopic.
--Chuck
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