On Wed, 20 Dec 2000, Michael wrote:
> This is an issue with the firmware on the drive itself. Intrestingly
> enough, I have 2 identical (??) 20 gig drives purchased at the same
> time that report differently to the kernel at boot. When probed, one
> reports CHS and the other reports LBA values. I haven't checked in
Well, I've noticed a similar situation too. If I have two identical disks
(even the same firmware revision), one connected to primary, the other to
secondary IDE controller, the first will report LBA and the later 'normal'
CHS. If I connect both to primary as master/slave pair, they both report
LBA values.
This seems to be 'normal', as I've seen it on virtually all
motherboard/disk combinations.
> Bottom line, it is important to note the probe values reported by the
> kernel and to use those values to set the bios on the motherboard
> since fdisk uses the bios values when creating the partitions and it
> seems like the kernel uses the probe values read from the ide
> interface. Maybe I haven't got it quite right, but this is as close
> as I've managed without digging into the code.
You can always use the 'hdx=cyl,head,sectors' to make Linux (and
fdisk) use the geometry you prefer. I usually adjust the secondary drive
params to those detected on the primary.
D.
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