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From: Oliver Iberien <oliver-mailinglist@charter.net>
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Date: Mon, 10 Apr 2006 20:18:56 -0700
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Subject: sysinstall won't write fs to new disk, bad magic number
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There was a thread about this a while ago, but it did not seem to end in a 
solution... In any case, I have a 160GB Seagate drive that I was trying to 
mount a partition on as /disk2. I went through the instructions in the 
Handbook under "Formatting Media for Use With FreeBSD." No formatting seemed 
to be happening, though. When I added it to fstab, something in KDE found it 
and then failed to open it. mount shows that it has not been mounted, and if 
I try to mount it:

bsd# mount -u /dev/ad1s2c /disk2
mount: /dev/ad1s2c on /disk2: specified device does not match mounted device
bsd# mount /dev/ad1s2c /disk2
mount: /dev/ad1s2c: Input/output error

I looked at the previous thread and then tried:

bsd# newfs /dev/ad1s2c
/dev/ad1s2c: 52627.0MB (107780084 sectors) block size 16384, fragment size 
2048
        using 287 cylinder groups of 183.77MB, 11761 blks, 23552 inodes.
super-block backups (for fsck -b #) at:
 160, 376512, 752864, 1129216, 1505568, 1881920, 2258272, 2634624, 3010976,
 ...
 107260480, 107636832
cg 0: bad magic number

I had two partitions on it, one to be used for linux later on. I tried 
swapping them out, but no difference. 

This drive worked under linux. Any ideas?

Oliver