Repeated Filesystem Corruption
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From: D.M. Procida on 10 Jul 2010 17:15 R <me32(a)privacy.net> wrote: > I am experiencing repeated filesystem corruption. > > It has occurred on both internal hard disks and an external USB flash > drive, all of which were HFS+ formatted and accessed by from OS X > 10.6.x. I'd always suspect a bad hard disk, but in your case, I don't know what to say. Daniele
From: Rowland McDonnell on 10 Jul 2010 20:00 D.M. Procida <real-not-anti-spam-address(a)apple-juice.co.uk> wrote: > R <me32(a)privacy.net> wrote: > > > I am experiencing repeated filesystem corruption. > > > > It has occurred on both internal hard disks and an external USB flash > > drive, all of which were HFS+ formatted and accessed by from OS X > > 10.6.x. > > I'd always suspect a bad hard disk, but in your case, I don't know what > to say. Last time I met symptoms similar, it was on my littlest bro's 80286 no-name PC - back in the days when you had to manually park the heads, and he never bothered. The disc surface ended up flaky and I don't mean that as a metaphor. So I suppose if nothing else can be shown to cause the problem, suspect a dying disc... Rowland. -- Remove the animal for email address: rowland.mcdonnell(a)dog.physics.org Sorry - the spam got to me http://www.mag-uk.org http://www.bmf.co.uk UK biker? Join MAG and the BMF and stop the Eurocrats banning biking
From: Andrew Hodgkinson on 11 Jul 2010 02:26 On 10/07/2010 13:24, R wrote: > It has occurred on both internal hard disks and an external USB flash > drive, all of which were HFS+ formatted and accessed by from OS X > 10.6.x. > The problems started occurring shortly after moving from OS X 10.5.8 Although you're not having odd crashes elsewhere, a hardware problem is still a possibility. You may have failing RAM in the machine. If it's a Mac Pro, this will be detected and reported in the system log. All sorts of strange things can happen with bad RAM, including things which seem inconsistent (e.g. only OS X HFS seems to get damaged and there are no other crashes might happen because the OS X filesystem drivers end up consistently loaded in a particular place in physical RAM and cause a particular pattern of RAM access). Otherwise, I suggest you try a clean installation of OS X at your earliest convenience - you should not be seeing regular filesystem corruption. The only time I've ever needed to repair a disc on Tiger through to Snow Leopard is due to the machine being switched off without being shut down. Once you've got the clean installation, verify that corruption is no longer happening. After you reinstall your applications, if corruption reappears, then you know that some 3rd party software you just installed is to blame. NB if you do a full Time Machine backup, install Snow Leopard 'clean', then use Migration Assistant to recover your Home folder from the Time Machine backup, reinstalling your applications gets a lot easier. Most of the preferences and registration details (where relevant) get stored in your Home folder's library, restored by the Migration Assistant and will be picked up by the application when installed. -- TTFN, Andrew Hodgkinson Find some electronic music at: Photos, wallpaper, software and more: http://pond.org.uk/music.html http://pond.org.uk/
From: Andrew Hodgkinson on 12 Jul 2010 12:19 On 12/07/2010 13:49, R wrote: > I'm wondering if more can be done in the way of direct diagnosis. > There are still those pesky files in lost+found. Perhaps there is a > pattern there to be discovered. I would like to know, too, what > exactly fsck (if that's what Disk Utility is using) has fixed. OK; well, you're going to have to start hitting Google and friends to read and learn all you can about the HFS+ filesystem then apply that knowledge to the error messages shown by Disk Utility when you try to verify a disk and it reports problems. -- TTFN, Andrew Hodgkinson Find some electronic music at: Photos, wallpaper, software and more: http://pond.org.uk/music.html http://pond.org.uk/
From: Chris Ridd on 12 Jul 2010 12:36
On 2010-07-12 17:19:06 +0100, Andrew Hodgkinson said: > On 12/07/2010 13:49, R wrote: > >> I'm wondering if more can be done in the way of direct diagnosis. >> There are still those pesky files in lost+found. Perhaps there is a >> pattern there to be discovered. I would like to know, too, what >> exactly fsck (if that's what Disk Utility is using) has fixed. > > OK; well, you're going to have to start hitting Google and friends to > read and learn all you can about the HFS+ filesystem then apply that > knowledge to the error messages shown by Disk Utility when you try to > verify a disk and it reports problems. Amit Singh's hfsdebug tool might prove helpful. TBH I'd boot a 32-bit kernel and see if the problem cures itself. -- Chris |