[Ham-Mac] Blue Screen iMac

[Dave Emery]

On Fri, Dec 03, 2004 at 05:16:02PM -0500, Chris Smolinski wrote:
> >
> >	I will resoundingly second this.   I have two or three times so
> >far rescued disks using DW that Apple Disk First Aid wouldn't touch and
> >in the process not lost any files except a few temporary ones open at
> >the time of the crash.
> >
> 
> fsck should be able to fix any volumes under OSX, although it might 
> require a little reading up on the usage, and it does require some 
> interaction/knowledge on the part of the user.

	I'm actually quite familiar with fsck from the Linux world, but
was unable to make the Darwin version fix the first trashed disk I had -
that induced me to buy Disk Warrior.    I think it produced cascading
and voluminous allocation overlap errors, for whatever reason disk
warrior seemed after endless hours of recovery (over 24 hours of sitting
cranking on the hard drive) to resolve this correctly down to a very
limited set of files that had to be deleted because of the the actual
overlap that really existed.

	I am not sure the algorithms are comparable given my experiance
with this incident of damage due to apparently damaged allocation maps -
though for many problems fsck and the apple cluster and permission fixing
utilities probably are just as good.

	But doing the best possible job of recovering from overlapping
block allocations with minimum lost data as the primary goal is possibly
a bit different than the fsck tendancy to mark anything that could overlap
anything else as corrupt.

	And Disk Warrior attempts to rebuild directories from inode data
and links in the file structure while fsck tends to throw up on trashed
directories.


-- 
   Dave Emery N1PRE,  die at dieconsulting.com  DIE Consulting, Weston, Mass 02493