On Sun, 1 Feb 2009, Chuck Guzis wrote:
  I've never seen one, but it's logical to
suppose that a double-speed
 drive that handles 1.3MB media has been made.  I'd expect to find it
 in Japan moreso than the West, however, since the Japanese used to be
 pretty much wedded to the NEC 9801 series archtecture that used 360
 RPM drives for everything. 
Well, that probably makes sense.
It seems that there are quite a few drives which may be used to
replace old 600RPM drives, but I haven't tried it yet.
Christian