Re: Fragility of 5.25" Diskettes

Previously Anton Ertl <anton@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> Arno Wagner <me@xxxxxxxxxxx> writes:
>>Previously Anton Ertl <anton@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> [the index hole]
>>For 5.25" it is only one hole for the track start and it is
>>used by all 5.25" drives

> It is obviously not used on drives where the disks could be flipped
> (like the Commodore 1541 drive). I guess there were some single-sided
> drives that used the index hole and could not use flipped discs
> (without punching an additional index hole in the sleeve), but
> probably only early in time. And if the single-sided drives did not
> use the index hole, I doubt that the double-sided drives did.

Actually the C64 was an exception and did not use a standard
floppy controller chip. A standard floppy controller chip does
require the index signal, otherwise it does not work. You
cannot flip 5.25" disks in a standard (PC) floppy.

Arno

.

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