This is a work in progress, but I have written a brand new large hard drive guide for those using Workbench 2.0/1 and 3.0/1.
http://eab.abime.net/showthread.php?t=32256
It is aimed at those using the ClassicWB, but is also a good guide for those wishing to add support themselves.
Had a lot of pointers off Thomas so thanks to him.
Also got a little carried away - turned into an epic novel without me realising.
I will be improving it and adding better examples and links as time goes on, then hopefully I'll place a guide into the EAB wiki.
Hope this makes it all clear for those interested. Happy