12" Floppy Disks

[Tom Gardner]

To the best of my recollection there never was any production FD greater
than 8-inches, but u don't have to rely upon my fallible recollection since
neither Porter's 1977 nor his 1982 Disk/Trends for FDDs mentions anything
about larger media diameter.    The 1977 version was the first one Jim
published.

Tom

-----Original Message-----
From: Jules Richardson [mailto:jules.richardson99 at gmail.com] 
Sent: Tuesday, September 15, 2015 12:03 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: 12" Floppy Disks

On 09/15/2015 03:39 AM, Adrian Graham wrote:
> Morning folks,
>
> I've been contacted by a teacher who's looking for any information 
> about 12" floppies. Am I imagining that they really existed? I'm sure 
> I've seen one or seen adverts for them, maybe at Bletchley Park. 
> Others he's contacted think he's getting confused with 12" laser discs 
> but I'm not so sure.

Ask him if he remembers whether the disk had a jacket or not, that might
help narrow it down. Was it read-write or read-only? Was it definitely
digital data or perhaps something analog-but-with-a-computer-application?