This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
I would recommend either ZZCopy or Photonix II, both are freeware and do a very quick and reliable job at duplicating 3.5 floppies (the former even works with 400K MFS and 800K HFS Macintosh disks). Either of the two programs work around damaged sectors on disks. By: kburtch@pts.mot.com, David Empson, Rubywand, The Enforcer
 
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