Re: Did Commodore cheat with the quad density floppies?

Den Fri, 4 Jan 2019 10:47:09 +0100 skrev silverdr@wfmh.org.pl:
> > On 2019-01-03, at 17:51, Mia Magnusson <mia@plea.se> wrote:
> > 
> > In practice the cassettes did differ rather much between models and
> > manufacturers.[...] the tapes differed a lot within each type.
> 
> They differed a huge lot! Especially among the Type I where one could
> get anything from a really good medium to a totally useless thing,
> which only purpose was to spread out and leave dirt on everything it
> came to touch.

I were more thinking about what, with a tape deck calibrated for the
few standard tape types, you'd get a non-flat frequency response. Tapes
such as TDK SA-X were especially made to give more treble, to
compensate for crappy equipment.

Afaik the resulting frequency response, with a given standard recording
method, is what the oerstedt value corresponds to.

Also noise levels did differ a lot.

> > This must surely have happened on diskettes also,
> 
> Yes. Never had a diskette, which made you open the drive and clean
> the heads afterward? ;-) But with diskettes I never encountered the
> kind of crap I saw on the compact cassettes. In general it was much
> better and far, far less of dirt scattering.

Yes, but also read errors were more common on cheap disks than more
expensive ones.

> > but as the media is > used in a different way the only important
> > things would be that the noise is under a certain threshold and the
> > "treble response" is good enough so data won't get lost at higher
> > bit rates, and of course drop outs.
> 
> Yes.



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