[X-Unix] Running fsck on a target disk

[Alexandre Gauthier]

Hi Eric,

I only asked since when you boot in single user mode and issue an fsck on
the root file system as per the instructions, it uses /dev/rdisk0sX, the raw
block device...

It's also what /etc/rc does, I believe... But thanks!


On 27/07/06 15:49, "Eric F Crist" <ecrist at secure-computing.net> wrote:

> Alexandre,
> 
> According to all the documentation from Apple I've read, and my small
> amount of experience, no.  You should use disk0s3, not rdisk0s3.
> Don't know the particulars though.
> 
> Eric
> 
> 
> On Jul 27, 2006, at 6:09 AM, Alexandre Gauthier wrote:
> 
>> Sorry for interrupting, but is that not supposed to be "rdisk0s3"? As
>> in, the raw block device? /etc/rc does this when fsck'ing...
>> 
>> Eric F Crist wrote:
>>> Thom,
>>> 
>>> There is only one 'trick' to running fsck. You need to define the
>>> mount point as one of the arguments, usually the last. On a typical
>>> Mac system running Mac OS X, you could run fsck on the primary file
>>> system by running:
>>> 
>>> # fsck_hfs /dev/disk0s3
>>> 
>>> To run the above command on an HFS formatted file system, type:
>>> 
>>> # df -h
>>> 
>>> This allows you to find out where your disk is mounted. When I
>>> connect
>>> a USB HFS formatted disk (an old startup volume, actually) I get:
>>> 
>>> Filesystem Size Used Avail Capacity Mounted on
>>> /dev/disk0s3 93G 34G 58G 37% /
>>> devfs 100K 100K 0B 100% /dev
>>> fdesc 1.0K 1.0K 0B 100% /dev
>>> <volfs> 512K 512K 0B 100% /.vol
>>> automount -nsl [201] 0B 0B 0B 100% /Network
>>> automount -fstab [205] 0B 0B 0B 100% /automount/Servers
>>> automount -static [205] 0B 0B 0B 100% /automount/static
>>> /dev/disk1s3 74G 67G 7.2G 90% /Volumes/Macintosh HD 1
>>> 
>>> I can see that my new mount, Macintosh HD 1, is filesystem
>>> /dev/disk1s3 which means, 2nd hard disk, slice 3. Computers typically
>>> start counting from 0, so 1 is actually 2. ;)
>>> 
>>> Finally, to run fsck, we use Apple's fsck_hfs utility against the
>>> above listed filesystem, NOT the mount point, /Volumes/Macintosh
>>> HD 1.
>>> 
>>> # fsck_hfs /dev/disk1s3
>>> 
>>> I hope this helps!
>>> 
>>> -----
>>> Eric F Crist
>>> Secure Computing Networks
>>> 
>>> 
>>> _______________________________________________
>>> X-Unix mailing list
>>> X-Unix at listserver.themacintoshguy.com
>>> http://listserver.themacintoshguy.com/mailman/listinfo/x-unix
>>> 
>>> Listmom is trying to clean out his closets! Vintage Mac and random
>>> stuff:
>>> http://search.ebay.com/_W0QQsassZmacguy1984
>> 
>> 
>> -- 
>> Alexandre Gauthier
>> supernaut at underwares.org
>> 
>> underwares.org
>> Obscure IT knowledge Open Database
>> 
>> The human brain operates at only 10% of its capacity. The rest is
>> overhead for
>> the operating system.
>> 
>> _______________________________________________
>> X-Unix mailing list
>> X-Unix at listserver.themacintoshguy.com
>> http://listserver.themacintoshguy.com/mailman/listinfo/x-unix
>> 
>> Listmom is trying to clean out his closets! Vintage Mac and random
>> stuff:
>>          http://search.ebay.com/_W0QQsassZmacguy1984
>> 
> 
> -----
> Eric F Crist
> Secure Computing Networks
> 
> 
> _______________________________________________
> X-Unix mailing list
> X-Unix at listserver.themacintoshguy.com
> http://listserver.themacintoshguy.com/mailman/listinfo/x-unix
> 
> Listmom is trying to clean out his closets! Vintage Mac and random stuff:
>          http://search.ebay.com/_W0QQsassZmacguy1984