SCSI Hard Disk Setup (Initial)

1. Turn off the EIIIX and SCSI device.
2. Connect the SCSI device (use 50-pin Centronics cable).
3. Set SCSI ID on external device to a number other than 5.
4. Turn on SCSI device.
5. Insert software floppy disk into drive.
6. Turn on EIIIX (it will load floppy OS).
7. Press Master/Global, then 77 (Format Disk).
8. Select drive, press ENTER, then Inc/Yes to confirm format.
9. Go to Master/Globals, 7, 4 (Copy Software).
10. Select source as Floppy, destination as Hard Disk.
11. Reboot system (Turn power off/on).

Source: Emulator IIIx — eiiix-operations-manual (manual)