To create the floppy, log-in to NT and insert a blank diskette into drive A:. Right-click the floppy disk icon in My Computer or Explorer and choose Format. In case you didn't know, every disk you format with NT is bootable, you don't have to copy any system files or manually make it bootable in any way.

Now, copy the files NTLDR, BOOT.INI, and NTDETECT.COM, and if present, NTBOOTDD.SYS from the root directory of your startup drive (usually C:) onto the floppy and you've created a bootable NT system floppy. You can also copy BOOTSECT.DOS (for dual boot installations). Reboot your computer to test it. If you have a dual boot configuration, you should get the same startup menu you get when you boot normally.

Note: NTBOOTDD.SYS will only exist if you're using a SCSI boot partition.