720RPM 3.5" FDDs?

[Chuck Guzis]

On 1 Feb 2009 at 13:24, Christian Corti wrote:

> While looking at datasheets of 3.5" floppy drive motor control ICs, the 
> LB1813 apparently supports four different speeds "out of the box". Pins 15 
> and 16 are used to select 300, 360, 600 or 720 RPM. So, I know 3.5" drives 
> with one of the first three speeds, but has anyone ever seen a 720 RPM 
> drive? A drive with that IC would be the very common Mitsumi D359.

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.

Cheers,
Chuck