Subject: Re: detecting two SATA masters?
To: Hubert Feyrer <>
From: Jason Thorpe <>
List: tech-kern
Date: 08/07/2005 15:12:12
On Aug 7, 2005, at 2:17 PM, Hubert Feyrer wrote:

> Hi,
> is it possible to make NetBSD detect and scream if it detects two  
> disks configured as SATA masters? Seems some PC backup software can  
> do that, see below.


I see the word "jumper" down there.  I don't think software is  
setting it, just that some backup software was able to deal with a  
mis-configured ATA bus.

Also, SATA doesn't have "master" and "slave".  SATA is a point-to- 
point serial interface.  There is only one drive per channel in SATA,  
and thus no notion of "master" and "slave".

>  - Hubert
> ---------- Forwarded message ----------
> Date: Sun, 7 Aug 2005 08:21:07 -0700
> From: s666666
> To: Hubert Feyrer <>
> Subject: Re[3]: [g4u-help] Won't copy and disables disk
> Hello Hubert,
> Friday, August 5, 2005, 9:24:34 PM, you wrote:
> HF> Other guesses welcome!
> Finally found the problem, I think. It was operator error after all.
> Turns out I didn't replace the "slave" jumper on the backup disk, and
> so the BIOS was faced with two master drives. I often test backups to
> make sure they really work, and most of the time I put the jumpers
> back. :-) Still booted up fine, though, but likely got confused as to
> which disk to write to.
> I switched to TrueImage and did a backup with ANOTHER backup disk that
> was properly configured. Worked well, as one would expect. When I
> again tried to use the misconfigured disk, TrueImage signaled a
> problem, and that was when I discovered the missing jumper. When it
> was put back in the drive, that disk worked as well.
> Is there a way to detect such a problem in g4u? If so, it might be
> nice to include it if not too difficult.
> I'm going to again try g4u, but with a properly configured disk. :-)
> Thanks much for the help, and for g4u!
> -- 
> Best regards,
>  s666666

-- thorpej