Some SCSI harddisk has to be set on 8-bit bus mode for older SCSI card such as Blizzard SCSI kit and your Blizzard 2060 SCSI controller.
I had this problem with my Fujitsu 9.1 GB HD 68 pins.
If you use HDtoolbox of AmigaOS 3.9 then you shouldn't have problems with crashing your Amiga.
