That is correct Ant


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AL'S COMPUTERS
"Ant" wrote in message
...
"J. P. Gilliver (John)" wrote:
In message , Paul
writes:
[]
If you read the Wikipedia article on floppy, you'll
find there are plenty of variants. Interworking is
not a property of them.

In some cases, it's actually media differences. The magnetic properties

I remember even seeing a hard-sectored 5.25" floppy. (Most such had one
hole in the index track: it synched an oscillator when it passed the
sensor in the index hole, and other sectors were when a certain time had
passed. This one had multiple holes.
aren't the same (from the various eras). The same thing happened

I don't remember that, other than the difference between low-density
(360K for 5.25", 720 for 3.5", for IBM PC use) and high (1.2M and 1.44M
on IBM PCs). [The 3.5" floppies had an extra hole in the case, for the
higher density IIRR; the 5.25" ones didn't.] For machines other than PCs
(Amstrad, BBC, Commodore, ...), I think it was mostly a
layout-of-sectors (and index [directory] structures) rather than actual
magnetic variation, though I guess there might have been some such.

IIRC, 3.5" disks could do 2.88 MB but I think it used compression to do
that?
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