To access +3 formatted disks and format disks to this format on Windows NT you will need the [http://simonowen.com/fdrawcmd/ FDrawcmd driver by simon owen]. This will only work with real floppy
drives, not USB floppy drives attached to laptops.
A good utility for writing the images is [http://www.seasip.info/Unix/LibDsk/#tools John Elliot's dsktool].
A guide to connecting a 3″ drive to a PC and reading/writing disks is available from the [http://www.worldofspectrum.org/sdp/FAQ.html Spectrum Disk Preservation Project]