> -----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. -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is copyright PD Inc, subject to license 20080407P00. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/