Re: 8050 which will write but not format

From: Julian Perry <>
Date: Sat, 1 Dec 2012 11:41:42 +1100
Message-ID: <>

You will get that problem if the drive spindle is running to fast.


Saturday, December 1, 2012, 11:17:18 AM, you wrote:

> Gents,

> I would not normally post 'please help me fix' type questions here but
> this one has me stumped. Some may already have seen the thread on 
> vintage-computer forums here:


> In a nutshell, drive 1 works 100%, drive 0 will read and write but not
> format. It usually stops on track 1 with a #21 read error but 
> occasionally will go as far as track 3 or 4. If I swap the mechanisms,
> the problem stays with drive1. This implies a problem in the analogue 
> board (micropolis pcb #8050006) but I can't find it and I don't 
> understand what kind of problem would allow it to write but not format.
> I know the mechanisms are good and well aligned and, as the drives read
> OK, they are properly speed adjusted.

> Do any of you disk wizards know the algorithms by which these drives 
> format a disk? I hoped this might give me a clue.

> Rob

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Best regards,

       Message was sent through the cbm-hackers mailing list
Received on 2012-12-01 01:00:44

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