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SubjectRe: Linux 2.2.14pre13
On Tue, 14 Dec 1999, Rogier Wolff wrote:

> Andre Hedrick wrote:
> > All modern drives are designed with DMA transfers.
> > Should DMA fault out for any reason......We revert to PIOing.
>
> Hi,
>
> Datapoint, don't have enough time to investigate further.
>
> - My Maxtor 27G drive ends up in PIO mode (non-SMP system, but likely
> an SMP-compiled kernel).
>
> Last time I reported this, I had a WDC31600, as hda, and the maxtor as
> hdb. Everyone was convinced that the WD was crap and causing the
> interrupt timeouts and the switchback to PIO.
>
> I removed the WD, and forgot to change the jumper on the maxtor. So
> the maxtor is now alone as drive hdb. It is still geting timeouts and
> then the switchback to PIO.
>
> I have an PIIX IDE controller. The system runs Kernel 2.2.14pre2.

Rogier,

You committed a mortal sin in ATA............
You never ever mix WD and Maxtor..........on day I will document why.
Basically these two vendors have timings that are completely incompatable
with each other on the same channel.

IMHO, WD is crap..........however, you may split the two pieces of
hardware and they will work fine under linux and all other OS's.

This rule of "never ever mix WD and Maxtor" is OS independent.

Do you mean Triton II classic PIIX?

Andre Hedrick
The Linux IDE guy


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