This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
In order to do High Density on the Apple II, you will need both the High Density 3.5" drive and the Apple 3.5" HD controller. If you don't have both, you will only be able to do regular density. Of course, you will also need High Density diskettes. Once you have collected the above items, you are in for a pleasant surprise. ProDos 8 programs not only recognize it, but most programs format and recognize HD disks just fine. You can even boot off of a HD disk, allowing plenty of room for System Desk Accessories and such. There are a few drawbacks: You cannot boot copy-protected software or some FTA demos. You can't daisy-chain a 5.25" on an HD card. Also, it takes up a slot, even on the GS. By: Benjamin Summers
 
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