[X-Unix] Running fsck on a target disk

[Alexandre Gauthier]

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

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