Here's our Windows NT Tip for.. March 12, 2002
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Close That Window
format it. You right-click the Floppy drive icon and choose Format. All looks well, but when you start formatting, Windows NT will decline to continue.

The reason is that you can't format a floppy disk that's open. To format the disk, close any window that displays the floppy's contents. Now choose Format again and all will proceed as it should.