Re: upgrading CBM-3040?

Den Wed, 15 Nov 2017 21:13:57 +0100 skrev Spiro Trikaliotis
<ml-cbmhackers@trikaliotis.net>:
> Hello,
> 
> * On Tue, Nov 14, 2017 at 03:13:06AM +0000 William Levak wrote:
>  
> > A 4040 should read 2040 disks, but you will not be able to write to
> > them.
> 
> Is the difference between the two formats known and documented?

IIRC:

Yes, for example in the (1541 oriented) book "Inside Commodore DOS".

IIRC there is a difference in timing from having read one sector to
writing the next sector.

If you format and rewrite a whole track the disk is still readable in
both drives, but then you have a disk that cannot easily be written in
either drive.

I'm not sure which drives falls into each group, only that there are
differences and the drives fall into two groups (afaik).

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