23 Mar
2010
23 Mar
'10
7:32 p.m.
On Tue, 23 Mar 2010, Gene Buckle wrote:
How are you going to handle the data rate difference?
If memory serves,
using 1.44MB media results in a higher RPM and a higher data rate.
3.5" drives don't change speed; they always run at 300 RPM. That's why
HD diskettes hold 1.44MB instead of 1.2MB.
The average PC HD 5.25" *also* doesn't change speed, but runs at 360 RPM
instead of the usual 300 RPM. That's why you need a data separator that
runs at 300 KHz instead of 250 KHz to read a DD diskette in the average
PC HD 5.25" drive.
The DEC RX33 5.25" drive *does* change speed. It runs at 300 RPM for DD
media and 360 RPM for HD media.
--
roger ivie
rivie at ridgenet.net