720RPM 3.5" FDDs?

[Dan Gahlinger]

would this in any way to be related to the IBM PC 'ED' disks?
the 2.1MB floppies that were out for a while?
I have some floppies of that format, not totally sure if I still have the drive though.

Dan.

> From: cclist at sydex.com
> To: cctalk at classiccmp.org
> Date: Sun, 1 Feb 2009 10:28:11 -0800
> Subject: Re: 720RPM 3.5" FDDs?
> 
> 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
> 

_________________________________________________________________
How fun is this? IMing with Windows Live Messenger just got better.
http://www.microsoft.com/windows/windowslive/messenger.aspx