Does this machine do disk spindown or have "green bios"?  If so I might
have a fix that helps you.  My laptop needs patches to the wd driver
because it gets too confused after a disk spindown.

Dave

>      Can someone please help me with a problem I am having installing 
>      netbsd 1.0. I have a dell optiplex xl/575 with a 1gb ide disk. The 
>      installation is fine until it tries to label the disk when the 
>      following error is displayed
>                wdc0: lost interrupt: error 0: status 0:
>      The installation loops continuosly displaying this error. The disk 
>      geometry (according to the bios) is 528 cyls 64 heads 63 sectors. On 
>      bootup netbsd sees it as 2112/16/63 I have tried using both geometries 
>       for the installation but get the same result.