On Fri, 6 Dec 1996, Andreas Brusinsky wrote:

> Does NetBSD have broblems with this disk?
> I get something like that at boot time:
> 
>  sd0 at scsi0 slave 0
>  sd1 at scsi0 slave 1
>  sd2 at scsi0 slave 2
>  scsi0 targ 6 abort from icmd phase=0x49, ssts=0xb2, ints=0x0
>  scsi abort gave up after 1000 tries (startlen=1048 len=1047)
>  scsi abort gave up after 1000 tries (startlen=1048 len=1046)
>  scsi abort gave up after 1000 tries (startlen=1048 len=1045)
>  scsi abort gave up after 1000 tries (startlen=1048 len=1047)
>  sd3 at scsi0 slave 6
>  .
>  . 
>  .
>  changing root device to sd0a
>  sd0:scsii sense class 7, code 0 =, key 2
>  sd0 WARNING: I/O error, using old default partitioning
>  panic: cannot mount root
> 
> I can disklabel the disk, copy an copy back files .
> Sometimes I had problems to dd the miniroot-12.fs to sd3a.
> After a while the system hung up completely.
> 
> The disk run for a year under my eyes without any problems under HP-UX 
> 9.00A. And I also tested the disk with a 360, 380, and 433T.

I saw some of the same problems under the Sparc port on a disk that 
worked flawlessly under SunOS with the same SCSI configuration.  
Basically SunOS (and probably HP/UX too) is very forgiving with SCSI 
errors, usually at the penalty of much slower speed.  My disk turned out 
to be perfectly good, but my termination was flaky.  I was using a 
terminator resistors on an old Archive QIC drive.  When I moved to a 
standalone external terminator, everything worked perfectly under 
NetBSD1.2.

>  
> PS: The hp disktab says that the disk has/uses/supports? ZBR.
>     Does anyone know this 'feature'?

I believe ZBR is just a method of encoding information on the disk, like 
RLL and MFM.
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