From owner-freebsd-questions  Thu Jan 11 22:22:31 2001
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Date: Fri, 12 Jan 2001 01:13:40 -0600 (CST)
From: Cary <scattered@babel.acu.edu>
To: Greg Lehey <grog@lemis.com>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: disklabel/newfs
In-Reply-To: <20010112162932.I21945@wantadilla.lemis.com>
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OK, dmesg after reboot with MO media IN the drive! :)

#dmesg
[snip]
da0 at ahc0 bus 0 target 0 lun 0
da0: <RICOH RO-3012E 8.00> Removable Optical SCSI-2 device
da0: 5.000MB/s transfers (5.000MHz, offset 15)
da0: 121MB (248826 512 byte sectors: 64H 32S/T 121C)

With this information, will I be able to format the disk with ufs, or is
there further digging I need to do?  I tried to newfs the drive again,
thinking that the OS might have been fooled into thinking that it was
just a normal drive:

# newfs /dev/da0
newfs: /dev/da0: `0' partition is unavailable
# newfs /dev/da0a
newfs: /dev/da0a: Invalid argument
# newfs /dev/da0c
newfs: ioctl (GDINFO): Invalid argument
newfs: /dev/da0c: can't read disk label; disk type must be specified
#

Obviously, FreeBDS didn't fall for it, andI still have not reached my
goal! :(

My continued thanks for your assistance, Greg.

Cary Mathews

Abilene Christian University
ACM Education Comittee


> > Greg, thank you for the explanations.  Below is the partition info you
> > requested:
> >
> > #disklabel -r /dev/da0
> > [snip]
> > 3 partitions:
> > #        size   offset    fstype   [fsize bsize bps/cpg]
> >   a:   247808        0    4.2BSD        0     0     0   # (Cyl.    0 - 120)
> >   c:   247808        0    unused        0     0         # (Cyl.    0 - 120)
> > #
> >
> 
> Hmm, I missed that this was an MO device.  I'm wondering if there
> might be a problem with the medium, or the fact that you booted it
> without a medium in the drive.  I'm not sure how to proceed from here,
> but here are some suggestions:
> 
> 1.  If practical, reboot with a medium in the drive.  That will give
>     us the information about what the system thinks the size is.
> 
> 2.  Otherwise (or just for the fun of it, anyway) try using dd to copy
>     data from the medium:
> 
>     dd if=/dev/da0c of=/dev/null
> 
>     This will take forever, but at the end it will tell you how many
>     sectors it read.
> 



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