I had exact same problem when I had both SCSI and IDE drives on my system
(and boot drive was SCSI). If you check out file drivers/ide/ide-geometry.c,
the potential hazard is spelled out in the comment:
* I did this, but it doesnt work - there is no reasonable way to find the
* correspondence between the BIOS numbering of the disks and the Linux
* numbering. -aeb
* The code below is bad. One of the problems is that drives 1 and 2
* may be SCSI disks (even when IDE disks are present), so that
* the geometry we read here from BIOS is attributed to the wrong disks.
* Consequently, also the former "drive->present = 1" below was a mistake.
* Eventually the entire routine below should be removed.
void probe_cmos_for_drives (ide_hwif_t *hwif)
... and it was removed in 2.5. I avoided this by just "return"-ing from this
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