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Groups > comp.sys.mac.system > #63105 > unrolled thread

10.6 no longer boots.

Started bySiri Crews <chine.bleu@yahoo.com>
First post2014-08-08 21:36 -0700
Last post2014-08-10 19:08 -0700
Articles 12 on this page of 72 — 10 participants

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Contents

  10.6 no longer boots. Siri Crews <chine.bleu@yahoo.com> - 2014-08-08 21:36 -0700
    Re: 10.6 no longer boots. Jolly Roger <jollyroger@pobox.com> - 2014-08-09 15:37 +0000
    Re: 10.6 no longer boots. Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2014-08-09 11:20 -0700
      Re: 10.6 no longer boots. Siri Crews <chine.bleu@yahoo.com> - 2014-08-09 17:20 -0700
        Re: 10.6 no longer boots. Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2014-08-09 22:31 -0700
          Re: 10.6 no longer boots. Siri Crews <chine.bleu@yahoo.com> - 2014-08-10 11:35 -0700
            Re: 10.6 no longer boots. Jolly Roger <jollyroger@pobox.com> - 2014-08-10 18:50 +0000
              Re: 10.6 no longer boots. Siri Crews <chine.bleu@yahoo.com> - 2014-08-10 11:53 -0700
                Re: 10.6 no longer boots. Jolly Roger <jollyroger@pobox.com> - 2014-08-10 18:55 +0000
            Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-08-10 15:09 -0400
              Re: 10.6 no longer boots. Siri Crews <chine.bleu@yahoo.com> - 2014-08-10 12:24 -0700
                Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-08-10 21:26 -0400
              Re: 10.6 no longer boots. Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2014-08-10 19:30 -0700
                Re: 10.6 no longer boots. nospam <nospam@nospam.invalid> - 2014-08-10 22:36 -0400
                  Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-08-11 01:43 -0400
                  Re: 10.6 no longer boots. nmassello@yahoo.com (Neill Massello) - 2014-08-11 09:54 -0600
                    Re: 10.6 no longer boots. nospam <nospam@nospam.invalid> - 2014-08-11 12:12 -0400
                    Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-08-11 15:49 -0400
                      Re: 10.6 no longer boots. Your Name <YourName@YourISP.com> - 2014-08-12 09:21 +1200
                        Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-08-11 18:32 -0400
                          Re: 10.6 no longer boots. Jolly Roger <jollyroger@pobox.com> - 2014-08-11 23:17 +0000
                            Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-08-11 23:28 -0400
                              Re: 10.6 no longer boots. Your Name <YourName@YourISP.com> - 2014-08-12 16:14 +1200
                                Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-08-12 01:40 -0400
                                Re: 10.6 no longer boots. Fred Moore <fmoore@gcfn.org> - 2014-08-12 14:21 -0400
                                  Re: 10.6 no longer boots. Your Name <YourName@YourISP.com> - 2014-08-13 09:16 +1200
                          Re: 10.6 no longer boots. Your Name <YourName@YourISP.com> - 2014-08-12 13:26 +1200
                            Re: 10.6 no longer boots. nospam <nospam@nospam.invalid> - 2014-08-11 21:35 -0400
                            Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-08-11 23:31 -0400
                              Re: 10.6 no longer boots. Your Name <YourName@YourISP.com> - 2014-08-12 16:12 +1200
                                Re: 10.6 no longer boots. nospam <nospam@nospam.invalid> - 2014-08-12 00:31 -0400
                                Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-08-12 01:40 -0400
                                  Re: 10.6 no longer boots. Your Name <YourName@YourISP.com> - 2014-08-12 17:57 +1200
                                    Re: 10.6 no longer boots. nospam <nospam@nospam.invalid> - 2014-08-12 02:54 -0400
                                    Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-08-12 03:14 -0400
                    Re: 10.6 no longer boots. nmassello@yahoo.com (Neill Massello) - 2014-10-16 22:46 -0600
                      Re: 10.6 no longer boots. nospam <nospam@nospam.invalid> - 2014-10-17 01:09 -0400
                        Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-10-17 02:35 -0400
                          Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-10-17 02:48 -0400
                            Re: 10.6 no longer boots. Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-10-18 01:42 +0000
                        Re: 10.6 no longer boots. nmassello@yahoo.com (Neill Massello) - 2014-10-17 01:45 -0600
                          Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-10-17 06:27 -0400
                            Re: 10.6 no longer boots. nmassello@yahoo.com (Neill Massello) - 2014-10-17 08:14 -0600
                              Re: 10.6 no longer boots. nospam <nospam@nospam.invalid> - 2014-10-17 10:55 -0400
                                Re: 10.6 no longer boots. nmassello@yahoo.com (Neill Massello) - 2014-10-17 10:12 -0600
                                  Re: 10.6 no longer boots. nospam <nospam@nospam.invalid> - 2014-10-17 12:41 -0400
                                    Re: 10.6 no longer boots. nmassello@yahoo.com (Neill Massello) - 2014-10-18 12:25 -0600
                                      Re: 10.6 no longer boots. nospam <nospam@nospam.invalid> - 2014-10-18 14:49 -0400
                          Re: 10.6 no longer boots. nospam <nospam@nospam.invalid> - 2014-10-17 10:54 -0400
                            Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-10-19 05:32 -0400
                Re: 10.6 no longer boots. Lewis <g.kreme@gmail.com.dontsendmecopies> - 2014-08-11 14:11 +0000
                Re: 10.6 no longer boots. Jolly Roger <jollyroger@pobox.com> - 2014-08-11 14:56 +0000
              Re: 10.6 no longer boots. nmassello@yahoo.com (Neill Massello) - 2014-08-11 09:54 -0600
                Re: 10.6 no longer boots. Jolly Roger <jollyroger@pobox.com> - 2014-08-11 16:25 +0000
                  Re: 10.6 no longer boots. Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2014-08-12 21:03 -0700
                    Re: 10.6 no longer boots. Jolly Roger <jollyroger@pobox.com> - 2014-08-13 15:10 +0000
                    Re: 10.6 no longer boots. Siri Crews <chine.bleu@yahoo.com> - 2014-08-13 09:52 -0700
                    Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-08-13 14:37 -0400
                      Re: 10.6 no longer boots. Siri Crews <chine.bleu@yahoo.com> - 2014-08-13 11:50 -0700
                      Re: 10.6 no longer boots. Siri Crews <chine.bleu@yahoo.com> - 2014-08-13 11:51 -0700
                    Re: 10.6 no longer boots. nmassello@yahoo.com (Neill Massello) - 2014-08-14 10:17 -0600
                      Re: 10.6 no longer boots. Kevin McMurtrie <mcmurtrie@pixelmemory.us> - 2014-08-14 20:43 -0700
                Re: 10.6 no longer boots. George Kerby <ghost_topper@hotmail.com> - 2014-08-11 14:39 -0500
                  Re: 10.6 no longer boots. Jolly Roger <jollyroger@pobox.com> - 2014-08-11 23:15 +0000
                Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-08-11 15:52 -0400
                  Re: 10.6 no longer boots. nmassello@yahoo.com (Neill Massello) - 2014-08-11 14:30 -0600
                    Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-08-11 18:42 -0400
            Re: 10.6 no longer boots. Jolly Roger <jollyroger@pobox.com> - 2014-08-10 20:32 +0000
              Re: 10.6 no longer boots. Siri Crews <chine.bleu@yahoo.com> - 2014-08-10 14:25 -0700
                Re: 10.6 no longer boots. FPP <fredp151@gmail.com> - 2014-08-10 21:26 -0400
                Re: 10.6 no longer boots. Jolly Roger <jollyroger@pobox.com> - 2014-08-11 01:32 +0000
                  Re: 10.6 no longer boots. Siri Crews <chine.bleu@yahoo.com> - 2014-08-10 19:08 -0700

Page 4 of 4 — ← Prev page 1 2 3 [4]


#63216

Fromnmassello@yahoo.com (Neill Massello)
Date2014-08-14 10:17 -0600
Message-ID<1lqd5oq.tbolosur4xn0N%nmassello@yahoo.com>
In reply to#63201
Kevin McMurtrie <mcmurtrie@pixelmemory.us> wrote:

> It takes a very long time to restore.  An older Drobo FS with 5 TB on it
> will struggle to produce 10 MB/sec.  If you can only afford one backup,
> then you essentially have no backup at all during the time it takes to
> rebuild your main system.  That's why recovery, even if you need to sync
> from backup to fix damage, is far preferred to rebuilding.

Have you ever used DiskWarrior on a 5TB volume? How long did it take? 

[toc] | [prev] | [next] | [standalone]


#63221

FromKevin McMurtrie <mcmurtrie@pixelmemory.us>
Date2014-08-14 20:43 -0700
Message-ID<mcmurtrie-AB376B.20434014082014@news.sonic.net>
In reply to#63216
In article <1lqd5oq.tbolosur4xn0N%nmassello@yahoo.com>,
 nmassello@yahoo.com (Neill Massello) wrote:

> Kevin McMurtrie <mcmurtrie@pixelmemory.us> wrote:
> 
> > It takes a very long time to restore.  An older Drobo FS with 5 TB on it
> > will struggle to produce 10 MB/sec.  If you can only afford one backup,
> > then you essentially have no backup at all during the time it takes to
> > rebuild your main system.  That's why recovery, even if you need to sync
> > from backup to fix damage, is far preferred to rebuilding.
> 
> Have you ever used DiskWarrior on a 5TB volume? How long did it take? 

DiskWarrior crashes or says it's out of memory on much smaller volumes.  
fsck_hfs can do it in about 4 hours, given a large enough cache.

-- 
Astraweb posts are filtered as spam

[toc] | [prev] | [next] | [standalone]


#63152

FromGeorge Kerby <ghost_topper@hotmail.com>
Date2014-08-11 14:39 -0500
Message-ID<D00E863A.AE678%ghost_topper@hotmail.com>
In reply to#63149


On 8/11/14 10:54 AM, in article 1lq7k28.1le6c2n20ivnkN%nmassello@yahoo.com,
"Neill Massello" <nmassello@yahoo.com> wrote:

> FPP <fredp151@gmail.com> wrote:
> 
>> I take it you don't have something like Diskwarrior...  I've
>> resurrected drives that wouldn't boot with DW before.
>> 
>> It's expensive, and a one-trick pony - but it does what it does very
>> well.  Their tech support will even give you a password that will
>> unlock hidden diagnostics within the program for specific needs.
>> 
>> I've heard of cases where it's run for hours, or even days to fix
>> problems on a drive.
> 
> Better to spend hours restoring from a backup than days on a recovery
> procedure that might not succeed. DiskWarrior is not a substitute for a
> backup. Nothing is. At this point, Drive Genius is a better buy.
> 

Sorry, that is just plain WRONG!

DW has saved my and my friends' ass MANY times when NOTHING else could come
close. 

Nothing can fix Directories like DW, period.

[toc] | [prev] | [next] | [standalone]


#63165

FromJolly Roger <jollyroger@pobox.com>
Date2014-08-11 23:15 +0000
Message-ID<c4t14aFqpk9U1@mid.individual.net>
In reply to#63152
On 2014-08-11, George Kerby <ghost_topper@hotmail.com> wrote:
> On 8/11/14 10:54 AM, in article 1lq7k28.1le6c2n20ivnkN%nmassello@yahoo.com,
> "Neill Massello" <nmassello@yahoo.com> wrote:
>> FPP <fredp151@gmail.com> wrote:
>> 
>>> I take it you don't have something like Diskwarrior...  I've
>>> resurrected drives that wouldn't boot with DW before.
>>> 
>>> It's expensive, and a one-trick pony - but it does what it does very
>>> well.  Their tech support will even give you a password that will
>>> unlock hidden diagnostics within the program for specific needs.
>>> 
>>> I've heard of cases where it's run for hours, or even days to fix
>>> problems on a drive.
>> 
>> Better to spend hours restoring from a backup than days on a recovery
>> procedure that might not succeed. DiskWarrior is not a substitute for a
>> backup. Nothing is. At this point, Drive Genius is a better buy.
>
> Sorry, that is just plain WRONG!
>
> DW has saved my and my friends' ass MANY times when NOTHING else could come
> close. 
>
> Nothing can fix Directories like DW, period.

Erasing and restoring from backup works just as well - nothing "wrong"
about it.

-- 
E-mail sent to this address may be devoured by my ravenous SPAM filter.
I often ignore posts from Google. Use a real news client instead.

JR

[toc] | [prev] | [next] | [standalone]


#63154

FromFPP <fredp151@gmail.com>
Date2014-08-11 15:52 -0400
Message-ID<lsb6uj$aag$1@dont-email.me>
In reply to#63149
On 2014-08-11 15:54:34 +0000, nmassello@yahoo.com (Neill Massello) said:

> FPP <fredp151@gmail.com> wrote:
> 
>> I take it you don't have something like Diskwarrior...  I've
>> resurrected drives that wouldn't boot with DW before.
>> 
>> It's expensive, and a one-trick pony - but it does what it does very
>> well.  Their tech support will even give you a password that will
>> unlock hidden diagnostics within the program for specific needs.
>> 
>> I've heard of cases where it's run for hours, or even days to fix
>> problems on a drive.
> 
> Better to spend hours restoring from a backup than days on a recovery
> procedure that might not succeed. DiskWarrior is not a substitute for a
> backup. Nothing is. At this point, Drive Genius is a better buy.

And you're telling ME this why?

I'm the guy who said:

> Really, backing up BEFORE you had a disk problem was the first, last 
> and only thing you really needed to do.
> At this point, if you're fucked, you're fucked.

You'll get no argument here... I'm a religious fundamentalist when it 
comes to backups.
-- 
It's not hard to meet expenses - they're everywhere.

[toc] | [prev] | [next] | [standalone]


#63158

Fromnmassello@yahoo.com (Neill Massello)
Date2014-08-11 14:30 -0600
Message-ID<1lq7wnz.1h8qizp16q8ermN%nmassello@yahoo.com>
In reply to#63154
FPP <fredp151@gmail.com> wrote:

> And you're telling ME this why?

Because at this point in the discussion, it's pretty clear that volume
repair will probably be a waste of the OP's time, even if it doesn't
take hours and hours. Some _data_ crucial to booting seems to be
damaged, and volume repair probably won't fix it. 

The OP's most sensible course of action would seem to be: recover as
much from the volume as possible, erase the volume and do a surface
scan, reinstall 10.6, and copy all the other (non-OS) files back to the
fresh volume. DiskWarrior won't be as useful for any of these tasks as
other (cheaper) software. 

[toc] | [prev] | [next] | [standalone]


#63164

FromFPP <fredp151@gmail.com>
Date2014-08-11 18:42 -0400
Message-ID<lsbgs7$ck7$1@dont-email.me>
In reply to#63158
On 2014-08-11 20:30:35 +0000, nmassello@yahoo.com (Neill Massello) said:

> FPP <fredp151@gmail.com> wrote:
> 
>> And you're telling ME this why?
> 
> Because at this point in the discussion, it's pretty clear that volume
> repair will probably be a waste of the OP's time, even if it doesn't
> take hours and hours. Some _data_ crucial to booting seems to be
> damaged, and volume repair probably won't fix it.
> 
> The OP's most sensible course of action would seem to be: recover as
> much from the volume as possible, erase the volume and do a surface
> scan, reinstall 10.6, and copy all the other (non-OS) files back to the
> fresh volume. DiskWarrior won't be as useful for any of these tasks as
> other (cheaper) software.

I didn't get that from:

> The 10.6 partition is on the same disk as the 10.7, and the 10.7 boots. 
> Also the
> partition is available once booted in 10.7. So it's not mechanical but 
> something
> about the disk contents or the PRAM (not yet tested).

The OP stated:

> Any ideas why a 10.6 partition would no longer boot? Disk Utility says it is
> bootable.

and then:

> So once I have a copy in addition to Time Machine I
> can fiddle with the internal drive.

So I figured maybe he wanted to try a few things before taking the 
final option, that's all.
Otherwise, he would have just done that in the first place, instead of 
asking for suggestions, no?

-- 
Never judge a man till you've walked a mile in his shoes.  By then, 
you're a mile away, you've got his shoes,and you can say whatever the 
hell you want. 

[toc] | [prev] | [next] | [standalone]


#63131

FromJolly Roger <jollyroger@pobox.com>
Date2014-08-10 20:32 +0000
Message-ID<c4q36gF7u89U1@mid.individual.net>
In reply to#63124
On 2014-08-10, Siri Crews <chine.bleu@yahoo.com> wrote:
> In article <mcmurtrie-3871F7.22313309082014@news.sonic.net>,
>  Kevin McMurtrie <mcmurtrie@pixelmemory.us> wrote:
>
>> Try booting into single user mode and fully reading the disk device
>> with 'dd' or one of the 'fsck' options.  I've had bad experiences
>> with Hitachi failing while still reporting a good SMART status.
>> MacOS X rarely reports fatal disk I/O errors on its own.
>
> I finally got the 64-bit 10.6 up again, but then it failed on reboot,
> so, crap, that means a race condition (unlikely) or a flakey disk or
> disk sector. Oh, well. I got an external disk with more than enough
> spare room, so I can copying off to a spare and all that kind of
> nonsense. Oh, mother pus bucket.

This would be a great time to consider using Time Machine for backups,
if you aren't already.

-- 
E-mail sent to this address may be devoured by my ravenous SPAM filter.
I often ignore posts from Google. Use a real news client instead.

JR

[toc] | [prev] | [next] | [standalone]


#63132

FromSiri Crews <chine.bleu@yahoo.com>
Date2014-08-10 14:25 -0700
Message-ID<chine.bleu-7B46E2.14254710082014@news.eternal-september.org>
In reply to#63131
In article <c4q36gF7u89U1@mid.individual.net>,
 Jolly Roger <jollyroger@pobox.com> wrote:

> On 2014-08-10, Siri Crews <chine.bleu@yahoo.com> wrote:
> > In article <mcmurtrie-3871F7.22313309082014@news.sonic.net>,
> >  Kevin McMurtrie <mcmurtrie@pixelmemory.us> wrote:
> >
> >> Try booting into single user mode and fully reading the disk device
> >> with 'dd' or one of the 'fsck' options.  I've had bad experiences
> >> with Hitachi failing while still reporting a good SMART status.
> >> MacOS X rarely reports fatal disk I/O errors on its own.
> >
> > I finally got the 64-bit 10.6 up again, but then it failed on reboot,
> > so, crap, that means a race condition (unlikely) or a flakey disk or
> > disk sector. Oh, well. I got an external disk with more than enough
> > spare room, so I can copying off to a spare and all that kind of
> > nonsense. Oh, mother pus bucket.
> 
> This would be a great time to consider using Time Machine for backups,
> if you aren't already.

Yes, but I get paranoid about disk drives.

-- 
:-<> Siri Seal of Disavowal #000-001. Disavowed. Denied. Deleted.
'I desire mercy, not sacrifice.'
Icke's razor: Given two equally plausible explanations, choose the weirder.

[toc] | [prev] | [next] | [standalone]


#63136

FromFPP <fredp151@gmail.com>
Date2014-08-10 21:26 -0400
Message-ID<ls964k$tth$1@dont-email.me>
In reply to#63132
On 2014-08-10 21:25:56 +0000, Siri Crews <chine.bleu@yahoo.com> said:

> In article <c4q36gF7u89U1@mid.individual.net>,
>  Jolly Roger <jollyroger@pobox.com> wrote:
> 
>> On 2014-08-10, Siri Crews <chine.bleu@yahoo.com> wrote:
>>> In article <mcmurtrie-3871F7.22313309082014@news.sonic.net>,
>>> Kevin McMurtrie <mcmurtrie@pixelmemory.us> wrote:
>>> 
>>>> Try booting into single user mode and fully reading the disk device
>>>> with 'dd' or one of the 'fsck' options.  I've had bad experiences
>>>> with Hitachi failing while still reporting a good SMART status.
>>>> MacOS X rarely reports fatal disk I/O errors on its own.
>>> 
>>> I finally got the 64-bit 10.6 up again, but then it failed on reboot,
>>> so, crap, that means a race condition (unlikely) or a flakey disk or
>>> disk sector. Oh, well. I got an external disk with more than enough
>>> spare room, so I can copying off to a spare and all that kind of
>>> nonsense. Oh, mother pus bucket.
>> 
>> This would be a great time to consider using Time Machine for backups,
>> if you aren't already.
> 
> Yes, but I get paranoid about disk drives.

All the more reason...
-- 
If your only tool is a hammer, everything begins to look like a nail.

[toc] | [prev] | [next] | [standalone]


#63137

FromJolly Roger <jollyroger@pobox.com>
Date2014-08-11 01:32 +0000
Message-ID<c4qkoqFb9caU2@mid.individual.net>
In reply to#63132
On 2014-08-10, Siri Crews <chine.bleu@yahoo.com> wrote:
> In article <c4q36gF7u89U1@mid.individual.net>,
>  Jolly Roger <jollyroger@pobox.com> wrote:
>
>> On 2014-08-10, Siri Crews <chine.bleu@yahoo.com> wrote:
>> > In article <mcmurtrie-3871F7.22313309082014@news.sonic.net>,
>> >  Kevin McMurtrie <mcmurtrie@pixelmemory.us> wrote:
>> >
>> >> Try booting into single user mode and fully reading the disk device
>> >> with 'dd' or one of the 'fsck' options.  I've had bad experiences
>> >> with Hitachi failing while still reporting a good SMART status.
>> >> MacOS X rarely reports fatal disk I/O errors on its own.
>> >
>> > I finally got the 64-bit 10.6 up again, but then it failed on reboot,
>> > so, crap, that means a race condition (unlikely) or a flakey disk or
>> > disk sector. Oh, well. I got an external disk with more than enough
>> > spare room, so I can copying off to a spare and all that kind of
>> > nonsense. Oh, mother pus bucket.
>> 
>> This would be a great time to consider using Time Machine for backups,
>> if you aren't already.
>
> Yes, but I get paranoid about disk drives.

I'm not following your logic. Your computer has a hard drive inside of
it. That hard drive can and *will* fail. It's only a matter of when. I
am suggesting you connect another hard drive to your computer to serve
as a Time Machine backup of the internal drive. If you are paranoid
about hard drives, you should feel *safer* having an up-to-date backup
of all of the important data on that drive.

-- 
E-mail sent to this address may be devoured by my ravenous SPAM filter.
I often ignore posts from Google. Use a real news client instead.

JR

[toc] | [prev] | [next] | [standalone]


#63140

FromSiri Crews <chine.bleu@yahoo.com>
Date2014-08-10 19:08 -0700
Message-ID<chine.bleu-D15909.19085110082014@news.eternal-september.org>
In reply to#63137
In article <c4qkoqFb9caU2@mid.individual.net>,
 Jolly Roger <jollyroger@pobox.com> wrote:

> On 2014-08-10, Siri Crews <chine.bleu@yahoo.com> wrote:
> > In article <c4q36gF7u89U1@mid.individual.net>,
> >  Jolly Roger <jollyroger@pobox.com> wrote:
> >
> >> On 2014-08-10, Siri Crews <chine.bleu@yahoo.com> wrote:
> >> > In article <mcmurtrie-3871F7.22313309082014@news.sonic.net>,
> >> >  Kevin McMurtrie <mcmurtrie@pixelmemory.us> wrote:
> >> >
> >> >> Try booting into single user mode and fully reading the disk device
> >> >> with 'dd' or one of the 'fsck' options.  I've had bad experiences
> >> >> with Hitachi failing while still reporting a good SMART status.
> >> >> MacOS X rarely reports fatal disk I/O errors on its own.
> >> >
> >> > I finally got the 64-bit 10.6 up again, but then it failed on reboot,
> >> > so, crap, that means a race condition (unlikely) or a flakey disk or
> >> > disk sector. Oh, well. I got an external disk with more than enough
> >> > spare room, so I can copying off to a spare and all that kind of
> >> > nonsense. Oh, mother pus bucket.
> >> 
> >> This would be a great time to consider using Time Machine for backups,
> >> if you aren't already.
> >
> > Yes, but I get paranoid about disk drives.
> 
> I'm not following your logic. Your computer has a hard drive inside of
> it. That hard drive can and *will* fail. It's only a matter of when. I
> am suggesting you connect another hard drive to your computer to serve
> as a Time Machine backup of the internal drive. If you are paranoid
> about hard drives, you should feel *safer* having an up-to-date backup
> of all of the important data on that drive.

I am using Time Machine. And I have a third drive with enough capacity to copy 
all of the internal drive. So once I have a copy in addition to Time Machine I 
can fiddle with the internal drive.

-- 
:-<> Siri Seal of Disavowal #000-001. Disavowed. Denied. Deleted.
'I desire mercy, not sacrifice.'
Icke's razor: Given two equally plausible explanations, choose the weirder.

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