[comp.sys.ibm.pc] BIOS ... more than 3 disks?

dck@cbnewsh.att.com (david.c.kwong) (04/07/91)

Are all BIOS's on the PC limited to 2 hard disks?
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:.
Is this a BIOS limitation?  Is there a way to get around it?
Thanks in advance.
					D. C. Kwong
					att!mink!dck

angelini@apollo.HP.COM (Bob Angelini) (04/11/91)

>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.