What network foulup? You've been reporting problems with a file system 
error, not networking problems.

As for your file system problems, it's not in any way clear that they 
are OS X related. HFS+ has, after all, been around for something like 5 
years; the error could have been lurking for a while and could, in part, 
be a drive hardware problem. You aren't using a "UNIX" file system, btw, 
you're using a Mac OS file system and problems with it have nothing to 
do with UNIX stability.

When you've booted from the install CD to run the disk utility, the hard 
disk is not supposed to be mounted. That way, with no files or 
directories open and in use, repair utilities can have the maximum 
effect. The fact that the installer won't let you (re)install to that 
disk has nothing to do with it not being mounted, either, it has to do 
with there being an existing installation of a concurrent or later 
version of OS X on that drive. It's supposed to omit that disk when 
showing eligible installation drives.

If you want to repair that disk, you really should start by getting 
DiskWarrior and running it from the booted, DW CD. If that fails, get a 
copy of Norton, boot from the NUM CD and run that, repeatedly, until the 
problems are all gone. I've have a similar problem that took several 
passes to fix.

How can you prevent this in the future? Never, ever do a hardware reset 
until all disk activity stops. OS X is a real, multi-threaded operating 
system and just because it seems to be frozen, that doesn't mean some 
processes aren't still working. Always attempt force-quit before 
rebooting. And, to repeat an earlier point, HFS+ is not a real, 
journaled, UNIX file system. If the system is halted and restarted in 
the middle of a disk write, some corruption is almost certain. Apple is 
aware that neither HFS+ nor UFS are appropriate for modern settings and 
have brought in a team of file system engineers who've worked for Apple, 
BeOS and others to come up with something dramatically better. Stay 
tuned.

On Saturday, July 6, 2002, at 11:39  AM, Nick Harman wrote:

> Some people have suggested that I may have brought this network foulup 
> in x
> on myself by 'fiddling'
>
> I can assure you that I have never felt any wish to go into the 
> terminal or
> single user mode or any of those other things. All I do is run the mail
> prog, IE and office. Not a lot to ask of an os is it?

and...

On Wednesday, July 3, 2002, at 2:42  AM, Nick Harman wrote:

> Used CD of X as start up cd - first aid reports 'invalid sibling link,
> repair completed' however its not repaired at all as if i run first aid
> again, i get the same message. Disk first aid also reports that the HD
> is not 'mounted'
>
> I cannot install a new system x as hard drive is not showing up , only
> the osx cd. Have tried 10.1 cd, same result.


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