Try this:
Use HD-Toolbox and enter as tooltyp "scsi_device_name=GVPscsi.device"
start hd-toolbox and read the config.
make a partition and fillup the reserved blocks with filesystms till there is no more space. This will overwrite data comimg fromthe mac which could cause trouble on the amigaside.
If this won't help just make once again a lowlevelfomat (still with hd-toolbox).
SACSI hds will perform a secure lowlevel if the manufacto alows it. If the manufactor doesn't allow it, then lowlevelformating will stop imediatly (just within seconds)
Markus