Re: (bootable) ProDOS floppies from Power Mac

[mjmahon@aol.com (Michael J. Mahon)]

In article <ZRf4a.10272$jR3.5289009@news1.news.adelphia.net>, "Steven N.
Hirsch" <shirsch@adelphia.net> writes:

>Michael J. Mahon wrote:
>>>
>>>I've usually been able to get around this by writing each disk in a ProDOS
>>>set twice; the resulting disk works great on either one of my machines. 
>> 
>
>> You should know that "writing a disk twice" does _nothing_ to increase
>> the level of the recording.  In fact each successive recording is
>relatively
>> uncorrelated with the previous recording(s) at the bit level, because of
>> normal tiny speed variations during reading and writing.
>
>Yes, but doesn't the head do a "bracketing" erase around the track it's 
>writing to minimize intertrack crosstalk?  I've noticed this "works the 
>second time.." effect on marginal media and/or drives myself.

Yes, it does, but it does it on the first write.  If the head is properly
calibrated, any subsequent writes will produce only tiny differences
in track and track erase positions.

Net effect, negligible.

-michael

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