Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sdd.hp.com!apollo!angelini
From: angelini@apollo.HP.COM (Bob Angelini)
Newsgroups: comp.sys.ibm.pc
Subject: Re: BIOS ... more than 3 disks?
Keywords: BIOS, SCSI hard disks
Message-ID: <50e8641d.20b6d@apollo.HP.COM>
Date: 11 Apr 91 11:23 GMT
References: <1991Apr6.223727.6690@cbnewsh.att.com>
Sender: root@apollo.HP.COM
Distribution: usa
Lines: 12

>I have 2 MFM hard disks as drives c: and d:.
>When I added in a Seagate ST01 SCSI controller, my
>(AT-clone) won't boot up but gives a disk controller error message.
>But if I go into the firmware setup and delete drive d:,
>then it boots up and recognizes the ST01 and its SCSI disks
>but I cannot access my old drive d:.

The problem is that DOS will only support 2 physical hard disks. You would
need to use a software driver to support the third disk. In the case of
an Adaptec SCSI controller you use their ASPI2DOS driver.