Ahh... I see...

First of all I've never came across someone managing to write the adfs directly to an HD's blocks (wouldn't have thought it was possible) and by the sound of it, if you have managed to do this then I'm betting you've overwritten the HD's RDB Blocks...

Whatever the case it looks very much like your going to have to ReInstall your HD like Smerf has said...

You'll need to google around and try and get hold of the Workbench Disks and in particular the Install disk, eBay or someone here is about your only option of getting these as AmigaKit don't sell them...

Hopefully someone here will be able to supply you with a Workbench disk set but without them you up a creek without a paddle for now... sorry...
