Re: Did Commodore cheat with the quad density floppies?

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Thu, 3 Jan 2019 15:12:48 +0100 Message-ID: <1772f91d-076d-14af-3a58-5cc787c2496b@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 1/3/19 2:50 PM, Mia Magnusson wrote:
> Den Wed, 02 Jan 2019 15:34:24 +0100 skrev André Fachat <afachat@gmx.de>:
>> Hi there,
>>
>> I was looking at floppy disk recording schemes and I am wondering if
>> the 8050/8250/1001 floppy disk format with over 500kB per side was
>> actually out of spec of even the Quad Density disks?
>>
>> The recording frequency was increased from 250kHz to 375kHz (× 1.5,
>> for the innermost i.e. most critical track/speed zone). That resulted
>> in a much increased number of bits per inch. See here:
>> https://extrapages.de/archives/20190102-Floppy-notes.html
>>
>> What do you think?
> 
> Afaik the 8050/8250/1001 drives are supposed to use "QD" disks, which
> seems to be a format that's supposed to handle a higher density than DD.

the (german) user manual that came with my 8050 back then mentioned 
'single density' as the disks required. Not that I ever tried that, 
always used DD.

  Gerrit