[hingusdingus]

Early 1990s dec machines: 3100 m series and 4000- 60 90 90a 705

If you have a modern scsi2sd card solution as your drive, off is fine. Just make sure all fans can spin prior to boot.

If you have a classic SCSI or expansion box with a big SCSI, on. Same situation if you have functioning dssi drives. Let them spin.

Don't have to read/write or full boot just get to Chevron prompts and do a show dev to get it all spinning.