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Format Floppy disk

Is it possible to format a floppy disk as double density? If so, how?

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It all depends on the densities supported with the particular floppy drive, as well as which type of floppy you've got. The only type of floppies (and floppy drives) I've seen for years are the 1.44MB ones, which are well beyond "double density": http://en.wikipedia.org/wiki/Floppy_disk_format
I guess the pinnacle of floppy storage would be 2.88MB-capable drives, but I've never seen one for sale, nor the disks that would hold that capacity.
I guess to answer your question more precisely, it should just work. Ordinary floppy drive, ordinary floppy disks from some office supply store or wherever, format, presto: 1.44MB
Neat-o cool 2.88MB floppy drive, where-did-you-ever-find-these 2.88 floppy disks, format, shazam! 2.88MB of floppy goodness.
See the second chart, at the bottom of that Wikipedia article, for the best rundown of floppy capacities. It's the "IBM PC compatibles"-style floppies that we still have around today.
Sounds like you need this for a older machine?
More info would be nice.

If you know what size you need, you can type " format /? " (without the quotes) in the START > RUN box. That will tell you the commands you need.
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Windows XP does NOT handle double density floppies, 720K.  When they made XP, they gave up legacy support for double density.  It is either 1.44 MB or nothing, sorry, that was their design decision.  It also does not handle 1.2 MB 5.25" drives correctly either.  You have to give that up too, it is 1.44 MB or nothing.
... Except you are forgetting that some bright spark invented the 120MB floppy drive some time ago too....

format    a:   /f:720

This should do it.  Well that's what the help under Windows 98SE tells me.

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