Re: C900 floppy format.

From: silverdr_at_wfmh.org.pl
Date: Wed, 21 Oct 2020 10:38:22 +0200
Message-Id: <0E8168D3-50EF-4BD6-9FED-218AAD3A298F_at_wfmh.org.pl>
> On 2020-10-21, at 09:06, Francesco Messineo <francesco.messineo_at_gmail.com> wrote:
> 
>>>>> Does anyone has been able to transfer Commodore C900 disks to a 5.25" double
>>>>> density, double track disk?
>>>> 
>>>> What do you mean by "transfer the disks"? Do you mean using DSDD disks
>>>> instead if DSQD in the C900 floppy drive? it is possible just like with
>>>> the 8250, most DSDD disks can be formatted but they won't be very reliable.
>>> 
>>> Never had a problem with using DSDD in a 8050 drive which is a 8250 with
>>> only a single head.
> 
> there's no "QD" magnetic media, SD/DD/QD magnetic media was always the
> same (300 oersted).

Right, but AFAIU that's not the point

> Probably the diskettes sold as QD/96 tpi were just higher quality.

Delivering higher resolution without changing the magnetisation characteristics. Similar to "Type I" in analogue audio tapes. One used the same oersteds/bias/eq for different tapes of the same "Type I" but the results could be _hugely_ different between different tapes.

-- 
SD! 
Received on 2020-10-21 11:00:03

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