** This is the quasi-official and semi-temporary T13 email list server. **
Being new to the BIOS world, I guess I am missing Hale's point. Phoenix is
implementing 48 bit addressing mode based upon a specification that came
from this committee. Currently, 48 bit drives will be autodetected and the
BIG part of the drive (>137GB) will obviously only be accessable when int13
extensions are called. However, it should be noted that Phoenix BIOS will
always use 48 bit addressing mode when extended reads and writes are issued
regardless of the LBA requested. These addresses are passed directly
through per EDD standard.
Gary Laatsch
Phoenix Technologies Ltd.
Email:[EMAIL PROTECTED]
Phone:949-790-2107
"Nothing is wrong with California that a rise in the ocean level wouldn't
cure. "
- Ross MacDonald (1915-1983)
-----Original Message-----
From: Hale Landis [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, July 11, 2001 12:53 PM
To: T13 List Server
Subject: [temp t13] Re: BIOS Large or LBA setting?
** This is the quasi-official and semi-temporary T13 email list server. **
On Wed, 11 Jul 2001 10:59:08 -0700, Gary Laatsch wrote:
>Also to answer Hale's last questions from the original email:
>Not in Phoenix BIOS. It will be AUTOmatic.
Let me see if I get this right...
A Phoenix BIOS generally does not have setup options for Large and
LBA but Phoenix has traditionally used Large (bit shifting) CHS
translation. Further since Phoenix probably has close ties to a
certain large OS vendor I can assume that Large (bit shifting) is an
acceptable algorithm (and perhaps even the prefered algorithm).
And... Since that certain large OS vendor doesn't seem to know how to
create OS boot sectors (MBR and boot sectors) that use something
other than CHS to boot their OS, I can assume it will continue to be
necessary to generate fake CHS geometry information (that is reported
by INT 13H AH=08H and used by FDISK in the MBR in the partition
table), even on 400GB drives. Further these OSs will continue to
require a <=2GB boot partition at the beginning of a hard disk drive.
Anyone care to comment or can anyone point me at any documentation
that describes something different? Is anyone aware of any attempt to
standardize a new partition table format that would support 48-bit
(or more likely 64-bit) LBA values?
*** Hale Landis *** [EMAIL PROTECTED] ***
*** Niwot, CO USA *** www.ata-atapi.com ***
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