SUMMARY: Corrupt labels on SCSI disks

From: David Thompson (
Date: Wed Mar 15 1995 - 01:48:50 CST

The problem, as I put it was
> Hi. I have just gotten a Quantum XP34301 SCSI drive for a SS10
>running Solaris 2.3. Unfortunately, the label on the disk is corrupt;
>when I boot, I get the error message "corrupt label - bad magic number",
>and sd is not loaded for that device, so it isn't placed in /dev/rdsk.
>I haven't been able to figure out how to change the label so that I can
>format it. Does anyone know how to change a corrupt label (or otherwise
>get sd to run so that the drive can be formatted)? I have tried putting
>an entry into /etc/format.dat, but it doesn't seem to do anything.

Thanks to Brett Lymn ( for pointing out that bad labels
are normal for drives that have not been partitioned. The drive was not
placed in /dev/rdsk when I rebooted because I was not using the "boot -r"
command at the OpenBoot prompt. The -r flag causes the /dev tree to be
reconfigured. Once this is done, running format will allow you to write a
good label.

David Thompson

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