Hmm... Others
on the list can chime in with their floppy expertise,
but from the way you are describing what you've tried, it doesn't
sound as if you have a clear picture of the media in front of you.
I dunno, RX50 format is easy to copy. Make sure that your 1.2M drive
is declared as such in the BIOS setup--if it's confused with a 1.44MB
drive, it's not going to work, as 2D operation on a 1.2MB requires a
write clock (300KHz) that conforms to a 360 RPM drive. A 1.44MB
drive is 300 RPM--so any attempt to write a 2D format using a 250KHz
clock rate is guaranteed to fail--you'll run out track before you run
out of data.
This is not an issue with ImageDisk, which doesn't look at the BIOS
settings at all. My main ImageDisk setup has an internal drive 3.5" HD
rive A which is configured as such in the BIOS, and an external cable
for attaching 5.25" DD40/DD80/HD or 8" drives as drive B, and the BIOS
has been told there is no drive B.
This makes it easy to work with ANY drive type - but the downside is
that you may have to set a data-rate translation if you are recreating
the disk on a different drive type than the one from which it was
recorded.
--
dave06a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools:
www.dunfield.com
com Collector of vintage computing equipment:
http://www.classiccmp.org/dunfield/index.html