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From: Damien Fleuriot <ml@my.gd>
Date: Sat, 3 Mar 2012 17:06:29 +0100
To: "Conrad J. Sabatier" <conrads@cox.net>
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Cc: netroby <hufeng1987@gmail.com>,
	"freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject: Re: Delete files let FreeBSD crashes.
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On 3 Mar 2012, at 16:37, "Conrad J. Sabatier" <conrads@cox.net> wrote:

> On Wed, 29 Feb 2012 09:24:55 +0800
> netroby <hufeng1987@gmail.com> wrote:
> 
>> Thanks .
>> I had resolved the problem :
>> 
>> 1. restart FreeBSD to single user mode.
>> 2. umount all device then run fsck -f
>> 3. after finished the fsck, restart FreeBSD , return to normal mode.
>> 4. delete the broken directory, and restore the data from backup.
>> 5. every thing seems ok now.
>> 
>> 
>> netroby
> 
> That's all well and good, but just for future reference, when you boot
> into single-user mode, the root partition will already be mounted
> read-only.  It's not necessary to mount any other partitions before
> running fsck, and in fact, it is advised *not* to do so.
> 

You misread his message, he said he *u*mounted partitions.