Re: What determines hard disk number?

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What's the boot order, regarding hard drives, in the bios settings?

--
Dave

"Bill Blanton" <bblanton@xxxxxxxxxxxxxxxxxx> wrote in message
news:%23VPFRSY9IHA.356@xxxxxxxxxxxxxxxxxxxxxxx
I don't think that XP necessarily follows the BIOS enumeration order. At
least
across different classes of device. My %boot%/%system% SATA drive is
disk0,
until I plug in a PATA HDD, in which case the boot drive becomes disk1,
and
the PATA becomes disk0.

However, I think the BIOS is still enumerating the boot SATA as 0.

If I boot to a floppy and run BootitNG the SATAs are enumerated before the
PATA.
I'm pretty sure that BING uses int 0x13 to communicate with HDDs.



"JS" <@> wrote in message news:%23xHKfdM9IHA.4820@xxxxxxxxxxxxxxxxxxxxxxx
Just to add to this, on one PC which I use, I installed a PCI Promise
card that provides two extra IDE channels. The PC sees the
card as SCSI. As soon as I connected an IDE hard drive to that card and
rebooted, my boot drive (which is an IDE drive connected
to the motherboard) changed from disk 0 to disk 1 and the drive connected
to the Promise card is seen by Disk Manager as disk 0.

It's still boots OK with the Disk 0 entry in the boot.ini file as the
Promise card I would guess is not detected by Windows until
after the drivers for this card are loaded.

JS

"Ian D" <taurus@xxxxxxxxxxx> wrote in message
news:O93%23ozE9IHA.4140@xxxxxxxxxxxxxxxxxxxxxxx

"Walter R." <wer25@xxxxxxxxxxx> wrote in message
news:%238KH$mE9IHA.1200@xxxxxxxxxxxxxxxxxxxxxxx
Thank you, Ian.

--
Walter

You're welcome. Another interesting thing I have found is
that if you have SATA and eSATA connectors with only
a SATA disk connected, it will be disk 0, but if you then
connect an eSATA disk, it will become disk 0, even if you
are still booting to the SATA disk. A disk connected to the
IDE master will always be disk 0, and the rest will re-rank.








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