[X-Unix] Running fsck on a target disk

[Eric F Crist]

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
>>
>>
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>
>
> -- 
> 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.
>
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>

-----
Eric F Crist
Secure Computing Networks