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RE: Wodim and ramping up speed [OT]
> -----Original Message-----
> From: Buchbinder, Barry (NIH/NIAID) [E]
> Sent: Monday, May 11, 2009 13:10
> Subject: RE: Wodim and ramping up speed
>
> Jason Pyeron wrote on Monday, May 11, 2009 12:33 PM:
> > I was just wondering if this is proper as it struck me as odd.
>
> No, it is not proper. It is off-topic for this mailing list.
> As far as I know, cygwin does not interact directly with
> hardware.
I was asking here, as wodim does not have a user list, and it is a cygwin port.
It asks Windows to do that. So speed issues will
> usually depend on the capabilities of Windows and the
> hardware, not cygwin, and thus OT.
>
> > I know that the maximum data throughput on a device is a
> function of
> > the radius and rotation speed, but why doe the disc speed (not write
> > speed) change?
> >
> > In fact it changes when the write speed changes too.
>
> That is true for hard disks. Audio CDs store data in a
> spiral, not ring-like tracks. They are read at constant
> linear velocity. See
Thanks, learn something new every day.
> http://en.wikipedia.org/wiki/Compact_Disc#Main_physical_parameters
> Scanning velocity: 1.2-1.4 m/s (constant linear velocity) -
> equivalent to approximately 500 rpm at the inside of the disc,
> and approximately 200 rpm at the outside edge Verifying
> that the same is true for data CDs is left as an exercise for
> the reader.
>
Then that would explain why the drive speed changes, but not why the data rate
is changing.
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