hmmm,
i've got a Sandisk ultra3 card in the CF adapter on the scsi2ide bridge in the A530 on my A500 (phew! got there!).
no amount of trying would get it to show as a device using HDtoolbox.
actually plugged it into a PC and kicked off a winXP install on it to see if it even worked. worked just fine.
plugged it into a bog standard A1200 (adapter set to master) via a 44 to 40 pin IDE cable, booted off the install floppy, and there it was, in HDtoolbox. bit of jiggery pokery with the drive type, heads, sectors, blocks etc. and partitioned fine. then plugged it back into the A530, and i could see it in HD toolbox just fine...
got a couple of sandisk ultra2's plugged into the IDE ports for a couple of 1200's working fine. no worries. via basic 44pin laptop CF adapters. no problems at all.
maybe the card had to be in IDE mode, and thats what the PC did? i dunno... if you can, hook the CF card and adapter to a PC to double check it all works... otherwise, not sure what to suggest... good luck anyway... :-?
--edit--
i remeber i also have a GVP HD8+ with scsi2ide bridge and compact flash adapter. nothing would show the compact flash card in hdtoolbox. too many links in the chain to figure out what was what till i put it into a bog standard A1200... and it showed up. put an RDB on the card. all working fine. plugged back into the GVP, and it showed up fine. had to re-write the RDB as GVP weren't using amiga standards at the time, but all was well...
maybe something needs to tell the card to operate in IDE mode? i don't know enuff about CF cards to guess... mostly they just work... sorry