Re: BIOS Drive Numbering

From: Frank Kotler <spamtrap@xxxxxxxxxx>
Date: Thu, 15 Dec 2005 07:05:31 -0500

Sol wrote:

Hi there.

I was wondering if anyone could tell me how the system BIOS determines
what number to assign to ATA/ATAPI devices.  I've read, for example,
that hard disks are assigned numbers starting at 80h, but I'm unsure
if, say, the primary master ATA/ATAPI device ALWAYS gets 80h,

My experience has been that the drive set "first" in the "boot order" gets 80h, regardless of its primary/secondary/master/slave position. I'm not sure if that's always the case. I don't know how numbers are assigned after that...

Best,
Frank

References:
- BIOS Drive Numbering
  - From: Sol

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