Ken Springer wrote:
On 11/14/17 12:41 AM, Paul wrote:
Japanese
standard which might have been a higher value (and perhaps a different
drive)

Might you be thinking of this?

http://www.appuntidigitali.it/site/w...3-a-103741.jpg


http://www.retroarchive.org/cpm/cdro...EWS/Z-NEWS.802 Excerpt
below.

Konica Technology, Inc., 777 North Pastoria Ave., Sunnyvale,
CA 94086-2918, 408/773-9551, ships KT-510 10-megabyte floppy drive in
volume.
Downwardly compatible with ordinary 360Kb and 1.2Mb drives (Z-News
607-4),
half-height 5.25" drive has embedded SCSI controller, 1.6 megabits per
second
data transfer rate, and 75 milliseconds average access time.
Diskettes--480
tracks per inch, embedded servo written--produced and sold by Konica,
for from
$10 to $25 depending on quantity, are conventionally jacketed, not
cased and
shuttered as are Kodak 10Mb units (Z-News 801-4). Such diskette prices
will
certainly come down if they are ever produced in high volume. Such
volume
depends on a major computer manufacturer using them in their products.
These high-capacity floppy drives, from either Kodak or Konica,
especial-
ly with the SCSI interface offer much easier and faster backup to RAM
and hard
disks than do tape drives. Random access, instead of sequential, to
stored
data make the difference. Make direct contact if you are interested in
using
one in your personal computer.


If you want to translate some Italian...

https://www.appuntidigitali.it/4855/...-14-per-10-mb/



I know they were available for Atari and Amiga systems, I don't know
about any other systems.


I never really understood what that setting was for, but it's
mentioned in the last paragraph in this floppy article. The number
3 refers to modes, not density. Who knew?

https://en.wikipedia.org/wiki/Floppy-disk_controller

"3mode" floppy drive

I thought it might have referred to a higher recording
density mode (because of the way the BIOS was worded),
but it just appears that some floppy drive supported
three different densities. That must mean the floppy
controller in the SuperI/O, was ready to deal with
three different looking patterns coming in from the
read head.

*******

That Konica thing isn't the highest density achieved,
as the LS-120 and LS-240 went higher than that. And
appeared to be floppy-media based, but with optical marks
for servo purposes (so a higher track pitch could be used).

In North America, people would have been more likely to
use ZIP drives. I have a ZIP250 here for example, for
interworking with work media. Mine was USB based, but
they made a flavor with parallel port interface as well.
That would be competitive with an LS-240. The cartridges
for the ZIP250 were pretty expensive.

Paul