The Amiga by default can only access 4GB hard disks. You therefore require SCSI device patches and an updated filesystem (such as SmartFileSystem) to access 4GB+ hard disks.
If you use the official Amiga SCSI patches you will require
Kickstart 3.1 ROMs.
Alternatively you can use the IDEFIX package with 3.0 ROMs then use an updated FileSystem to access beyond the 4GB such as SmartFileSystem or ProfessionalFileSystem.
Its also recommended to use HDInstTools from Aminet rather than the standard HDToolbox
