Least PC-Compatible MS-DOS machines?

On 2014-06-03 8:35 PM, Chuck Guzis wrote: What Victor did with their diskettes is something that that has been routinely done with disk drives for some time now, what is different is the way they did it. For rotating magnetic media the tracks near the outer edge are physically longer than those on the inner tracks so in a normal diskette drive the bits on the other track are further apart. What techniques like what Victor did do is alter the bit rate as you move across the surface so that on the outer tracks you had approximately the same linear bit density as on the inner tracks. It is not practical to make this adjustment for every track so the surface is divided into zones and when you move from one zone to the next the amount of data per track changes. Now there are two ways that you can do this, one is to shift the clocking rate of the data, the other is to vary the spindle speed. The later is the technique used in the Victor 9000. The down side of this technique is when you move from zone to zone there will be a delay while you wait for you spindle speed to settle. Any hard disks drives that I am aware of, run at a constant spindle speed, but alter the clock rate, which has a much lower penalty when moving from zone to zone, if any at all. There was a comment made earlier about them being sued over the Victor name, it was actually the Sirius name they where sued over. After leaving Commodore Chuck Peddle started the Sirius Systems and they later merged with the Victor Company, an established calculator manufacturer who not too many years later went bankrupt.