Re: MFM drive gone nuts

From: Clockmeister <*clockmeister_at_internode.on.net*> Date: Wed, 23 Jul 2014 06:35:11 +0800 Message-ID: <53CEE71F.2010005@internode.on.net> · clockmeister_at_internode.on.net

On 22/07/2014 6:55 AM, Justin wrote:
> On Jul 21, 2014, at 6:29 PM, Clockmeister <clockmeister@internode.on.net> wrote:
>
>>> largely avoiding the
>>>> start-up latency by turning on early and delaying turn-off.
>>>>   SD is certainly entitled to prefer fiddling with jumpers and needlessly
>>>> spinning unselected diskettes,
>>> "Fiddling" takes less than a minute.
> I disagree.  The MFM controllers in particular sometimes had a large number of jumpers and the time required to cycle through them when a drive’s specifications/format were poorly documented in the materials available at the time could be considerable if you had to keep rebooting after every permutation. I ran into this more than once and it was especially annoying in the cases that others have mentioned here where despite using an MFM controller card from the same MFR as the system the drive came out of, no permutation would make the drive readable.
>
> Justin

For the record, I didn't write the comments you were replying to ;-)

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