According to the manual you need atleast a SuperBuster -09 (but I would install -11 to be sure) and if you use an A3640 vers. 3.0 acceleratorcard then you need to change the clock drive chip 74FCT244 to a 74FCT240. If it is a version 3.1 then you need the 74FCT244. You need the z3scsi.device also and remember to write it in the icon of hdtoolbox so it can scan for the right scsi device.
Then the manual warns about never use the "Reload geometry" command ´cause it will destroy the info on the harddisk that previously have been used on the Amiga controller.
Did you know all this? I´m asking because I don´t know how much you know. :-)