4 Mar
2007
4 Mar
'07
4:17 a.m.
The 300k data rate tells me that you recorded this on
a
1.2M HD drive - I'm assuming you did not specify a 300-250k
data rate translation when you recorded it (?)
Assuming all that, it should write back to a 1.2M HD drive
with ImageDisk. It should also write back to a 80 track DD
drive such as TEAC-55F or SA-460 or TM-100-4. You would need
to set a 250->300k data rate translation to write on a DD drive.
That should read '300->250k' data rate transation in the last
line. If you recorded on an HD drive and did not set a data rate
translation, the image will indicate a 300k data rate. This is
because HD drives operate at 360rpm and need a higher data rate
for the same bit density as a DD drive which operates at 200rpm,
and has a data rate of 250k). So to write the image to a DD
drive, you need to change the data rate to 250k.
I implemented it this way in ImageDisk because it seemed to be
the most flexible way to deal with the different data rates, and
didn't tie the system to predefined "drive types" (in other
words, ImageDisk operates by what it observes and can set at the
controller, not at what it "thinks" is attached to the floppy
cable), however a lot of people have trouble with it - In
a future version of ImageDisk I may change this over to a scheme
where you specify a drive type, and have the program automatically
determine what the data rate should be.
Dave
--
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