29 Mar
2023
29 Mar
'23
2:18 a.m.
Far more than you wanted to go through:
Fred,
Not at all. As always lots of wisdom condensed into a short post. This one
is going into my "Posts to Save" folder!
"2.8M" has an unformatted capacity of 4M
The disk that you linked a picture of says "406TPI"!
Therefore, it presumably has about three times as many tracks. (240?),
which, if it does a 1,000,000 bits per second, with track density the
same
as "2.8M", would give it an UNFORMATTED capacity of 12M, and a
formatted
(data) capacity of about 8.5M.
Perfectly predicted and exactly as the PR announcement and info I have found
says it should be!
From Wikipedia:
https://en.wikipedia.org/wiki/List_of_floppy_disk_formats#Physical_compositi
on
Density Tracks tpi bpi Coercivity
Unformatted capacity per side
Triple[14] 240 406.5 36,700 6,500 KB
-Ali