Some of the better quality 3.5" drives had a jumper to select low/high
density disks.
(maybe that was 780?kb or 1.44Mb, TEAC and SONY, IIRC were drives that did
have the jumper).
If you wanted to, an accessible external switch could be added. Most drives
are capable of detecting lo/hi density disks, but most machines don't
utilize the capability (as most machines will ignore that the drive is
empty, and attempt to read data anyway, even though there are switches to
detect that the drive is empty).

WB
..........
metalworking projects
www.kwagmire.com/metal_proj.html


"Gerald Miller" wrote in message
...
Junior had a client to whom I was able to provide a couple of the
lower density 3.5" drives - the equipment couldn't handle the 1.44 meg
drives. Older welding robots also needed the lower density.
Gerry :-)}
London, Canada