4 floppy disk drives on a PC?

[Dan Williams]

> 
> To add to the fun,...
> SOME drives had a media sensor that would adjust the write current for HD
> diskettes, others required that come from a signal from the controller.
> 
> The early PS/2 drives did NOT have a sensor.  They would "successfully"
> format a 720K diskette to 1.4M.  (Reliability was less than perfect due
> to 600 Oersted v 750 )  But then, when that disk was put into a
> drive that had a sensor, the drive would have problems with it.
> 
That's what hole punches are for...........

Dan