Date: Thu, 24 Apr 1997 02:23:11 +0930 (CST) From: Kristian Kennaway <kkennawa@physics.adelaide.edu.au> To: freebsd-questions@freebsd.org Subject: Re: Corrupted disk slice Message-ID: <9704231653.AA13169@bragg>
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>
> Wolfgang Helbig <helbig@MX.BA-Stuttgart.De> wrote:
>
> > Extended partitions are not recognized by our fdisk, so it says it's
> > unused.
>
> That's not true. As my inclusion of my 'fdisk' output showed, my extended
> partition is partition 1 (aka slice 2):
>
> The data for partition 1 is:
> sysid 5,(Extended DOS)
> start 1048320, size 3144960 (1535 Meg), flag 0
> beg: cyl 130/ sector 1/ head 0;
> end: cyl 519/ sector 63/ head 127
>
> > If you build a file system on slice four, it is overlaid by the extended
> > partition and the logical partitions inside the extended partition.
>
> No - there is nothing magic about slice four. (this is all on a 2.1.5R
> system, but I'm pretty sure I've seen the same thing on earlier versions)
Okay, so what you are saying is that the fact that I had a freebsd
partition on wd1s4, with dos partitions on wd1s1 and wd1s5, could not
have been the single cause of the now-missing partition? Since sysinstall
was the one who decided to put my partition on wd1s4, I'd think this is
the case.
The following may help:
[morden] 1:46 ~ fdisk wd1
******* Working on device /dev/rwd1 *******
parameters extracted from in-core disklabel are:
cylinders=621 heads=128 sectors/track=63 (8064 blks/cyl)
parameters to be used for BIOS calculations are:
cylinders=621 heads=128 sectors/track=63 (8064 blks/cyl)
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 0 is:
sysid 6,(Primary 'big' DOS (> 32MB))
start 63, size 2048193 (1000 Meg), flag 0
beg: cyl 0/ sector 1/ head 1;
end: cyl 253/ sector 63/ head 127
The data for partition 1 is:
sysid 5,(Extended DOS)
start 2048256, size 2048256 (1000 Meg), flag 0
beg: cyl 254/ sector 1/ head 0;
end: cyl 507/ sector 63/ head 127
The data for partition 2 is:
sysid 165,(FreeBSD/NetBSD/386BSD)
start 4096512, size 911232 (444 Meg), flag 80
beg: cyl 508/ sector 1/ head 0;
end: cyl 620/ sector 63/ head 127
The data for partition 3 is:
<UNUSED>
I'm assuminbg partition 3 here is the one which I used to have but no
longer do. partition 1 is on wd1s5, 2 is on wd1s3.
Trying to disklabel the invalid partition gives me this:
[morden] 1:54 /dev disklabel -r rwd1s4e
disklabel: /dev/rwd1s4e: Invalid argument
and likewise with the other slices on this partition.
Kristian
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