I should mention that I am drawing an analogy---possibly a false
one---between Jukka's situation on Sparc and my situation on the G4 Cube.
It does not seem unreasonable to think that MacOS, too, would constrain
partition boundaries to cylinder boundaries, and disklabel would try to
preserve those constraints.

Dave

On Fri, Mar 30, 2001 at 05:18:54PM -0600, David Young wrote:
> 
> Some people complain that the disklabel program will not write a new
> disklabel.  Instead, it complains of some ioctl error.
> 
> Doing a Google search on 'disklabel ioctl error', I found Jukka Marin's
> complaint (below) and a hint at a solution: try aligning your partitions
> on cylinder boundaries.
> 
> I suffer from the ioctl error myself. I have not tried to re-align
> partitions on cylinder boundaries, but I am going to shortly.  I fear
> that I am going to have to scoot around half the partitions on my disk
> before I achieve the desired alignment, though.
> 
> Dave
> 
> On Tue, 19 Jan 1999, Jukka Marin wrote:
> >Argh.  Now disklabel gives me the error even when total
> >disk size is below 2 GB:
> >
> >disklabel: ioctl DIOCWDINFO: Label magic number or checksum
> >  is wrong!
> >
> >WHAT am I doing wrong??
> >
> >Six hours labeling one stupid disk.. no ideas left :-(
> 
> I've lost a lot of time on this in the past too...To keep labels
> compatible with SunOS, partitions offsets and sizes must be on cylinder
> boundaries.  I'll bet that's what's going on.
> 
> I hope this helps...
> 
> 			  -Dave McGuire
> 
> 
> -- 
> David Young                   On the Job Consulting
> dyoung@onthejob.net     Urbana, IL * (217) 278-3933

-- 
David Young                   On the Job Consulting
dyoung@onthejob.net     Urbana, IL * (217) 278-3933