3.5" floppy drive question(s)

[Fred Cisin]

On Sat, 11 Oct 2008, Curtis H. Wilbar Jr. wrote:
> Was wondering if 3.5" HD floppy drives can be jumpered/used in
> a system that only supports 720K, using them as 720K only
> drives ?

yes

> Also, anyone know if there if it is possible to slow the spindle speed
> so that 1.44M can be done on machines that only have DD data rate ?
> (and if so, any of the above drives capable of being slowed ?)  Would
> that even work ?

Nobody has successfully used a 3.5" at 150RPM.  Yet.
Besides the "normal" 300RPM drives, there are some 600RPM (old Sony), and
360RPM (NEC and a few others)