On Wed, 24 Apr 2002 11:38:33 -0700
Larry Sword <[EMAIL PROTECTED]> wrote:
> Check your /var/log/dmesg for a line (something like):
>
> Uniform Multi-Platform E-IDE driver Revision: 6.31
> ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
That line does not denote the UDMA state of a hd.
It is the bus speed for all pci devices and can perform at no higher than 33mhz.
AGP slots and ide controllers (both of which are also pci slots) overcome this by use
of additional chips and instructions to increase their speed, but the baseline still
will remain at 33mhz.
That is why if your MOBO supports only UDMA66 you can still use udma100 or even
udma133 hds but at no higher level than udma66 unless you make use of an add-on
controller card which contains the necessary chipset and instructions to provide for
udma100/133.
Charles
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