Re: upgrading CBM-3040?

Den Fri, 17 Nov 2017 02:50:57 +0000 (UTC) skrev William Levak
<wlevak@SDF.ORG>:
> 
> 
> The differences are in the "user's manual for CBM 5 1/4-inch dual
> floppy disk drives", october 1980. The 2040/3040 has one more sector
> on tracks 18-24. The 4040 drive can handle that.  The BAM header has
> a different version identifier, so the drive will not write to it.

Were there any obvious reason for not doing this on the later drives?

Also it's kind of strange that Commodore AFAIK never used 40 instead of
35 tracks on any of their 35/40 track drives, except for MFM disks on
1571.

At least the double sided 1571 format should have used all 40 tracks,
perhaps with MFM encoding.

(I understand that the existing data speeds for CGR were too fast for
track 36-40, but a new version of a drive could had been made with
another GCR speed or in the 1570/1571 case have used MFM).

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