Disk utility says repaired but problem still comes back

Can anyone tell me why this won't go away after it says its been repaired? It continues to exist as un repaired.
User differs on “private/var/db/displaypolicyd”; should be 0; user is 244.
Group differs on “private/var/db/displaypolicyd”; should be 0; group is 244
Repaired “private/var/db/displaypolicyd”

Thanks for these replies.
I've got regular time machine backups and just backed up some of my data by copying some key folders to an external drive. I'm bit paranoid about backup integrity and would ideally like to do another full backup to a different drive using a system other than time machine, in the event that something goes wrong with the time machine backup. Any recommendations on good and affordable backup software to do a backup of my TM backup?
One other question: I seem to encounter problems like this pretty frequently. I'd say once a year or so, my drive fails completely or gets near enough to failing that I have to wipe and restore. (I've never had a TM backup fail to work, though the last go around there were some hiccups which has led to my backup paranoia.) I've had this happen on multiple computers, so I'm becoming pretty convinced that the problem lies somewhere in my data. Is it possible (even likely) that there's something in my data causing this recurring problem? If so, is there anything I might be able to do to try and pinpoint and address this problem? I'd love to go one year without having to wipe/restore my machine!
For a while I thought I just had bad luck. But I think this is like the 4th or 5th time this has happened in the past 4 years and every time, I'm restoring from a backup, so I come back with the same data. It's the one constant since I've had 3 different machines over this same time period.

Similar Messages

HT1782 External HD won't mount, suggests disk utility to repair, but I can't back it up.

Hello,
I'm having some problems with my Western Digital My Passport 1TB. When I plug it in I receive an error that says "the disk you inserted was not readable". I've read some suggestions that say to you Repair on Disk Utility, but others that say to back it up first. Unfortunately the disk won't mount so I can't back it up. Am I best to unplug it and try it on a new machine? Or verify? Or repair?
I'm sure this goes without saying, but the contents are extremely valuable to me. What is the safest method to retrieve it?
Thanks very much for your help.

I would try shutting down, unplug the WD external drive, restart and after getting to my Desktop, plug the WD drive in and see if it's mounted and readable.

Whilst synching to my PC it said there was a software update for the iPhone. It is now stuck with a message saying connect to iTunes. I've tried resetting it in various ways but it still comes back to Connect to iTunes, but it won't. Help!

Whilst synching to my PC it said there was a software update for the iPhone.
It is now stuck with a message saying connect to iTunes. I've tried resetting it in various ways but it still comes back to Connect to iTunes, but it won't.
Help!

See Here > http://support.apple.com/kb/HT1808
You may need to try this More than Once...
But... if the Device has been Modified... this will Not necessarily work.

The problem may be temporary. Try again later to back up. If the problem persists, use Disk Utility to repair your backup disk. Have tried disk utility to repair but still not working.

My time machine backup has failed for the last couple of days. Im getting the message saying," error. this may be temporary, if the problem persists, go to disc utility to repair the problem."
I have done the first aid in the disc utility and still not repaired. Do I erase the disc, as it says????

1. Reboot the TC alone.. Just pull out the power cord.. count to 10 and plug it back in.
If TM still cannot find the disk..
2. Do a full network reboot.. everything off.. restart in correct order.. modem.. wait 2min.. TC wait 2min.. then all the clients..
If TM still cannot find the disk..
3. Factory reset the TC and do a fresh configuration. The TC is known to occasionally throw a wobbly and spontaneously forget its name.. part of old age.. (2years is starting towards old age for a TC).
The Factory Reset Gen1-4.
Unplug your TC. Hold in reset. and power the TC back on.. without releasing reset for about 10sec. When the status light flashes rapidly; release it.
Be Gentle! Feel the switch click on. It has a positive feel.. add no more pressure after that.
TC will reboot after a couple of minutes with default factory settings and will wipe out previous configurations.
No files are deleted on the hard disk.. No reset of the TC deletes files.. to do that you use erase from the airport utility.
If TM still cannot find the disk..
4. Wipe the old backup.. and start afresh.. this sometimes also happens.
You can try a verify of the disk. See A5 here.
http://pondini.org/TM/Troubleshooting.html
Sometimes a clean fresh TM backup is the only way.
Good luck.

Disk Utility and repair permissions problem after upgrade 10.5.1

*Problem with Disk Utility* - +repair permissions don't work anymore+
After upgrading to OS X 10.5.1 tried to correct permissions with Disk utility. But I'm not able to repair permissions, because I get this message every time "fault: The underlying task reported a fault at concluding." and permissions repair stops. Has anyone else had this problem and does anyone have any idea how to get this working again?

Will try installing OS X 10.5.1 again from the downkoad that you recommended. Won't be able to do this untill after the New Year but I'll let you know if this helped. I had another problem after he 10.5.1 upgrade and that was that the Security update 2007-009 also refused to install. Could this be related too the problems with Disk utility and the permissions problems.

Disk utility says repair needed but repair grayed out

I ran a disk utility verification, which indicated that repair was necessary. However the repair option was grayed out. How do I effect a repair?

Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.

What do I do if Im 100% sure Im entering my itunes gift cert correct but it still comes back as invalid?

What do I do if Im 100% sure im entering my itunes gift cert correct but it still says invalid?

See if this page helps : http://support.apple.com/kb/TS1292
If it doesnn't then contact iTunes support and see if they can help : http://www.apple.com/support/itunes/contact/ - click on Contact iTunes Store Support on the right-hand side of the page

Macintosh HD won't boot, but disk utility says "The volume Macintosh HD appears to be OK." How do I repair the hard drive?

I have a MacBook that needs its internal hard drive's Macintosh HD partition repaired, as the boot screen freezes on startup. I am running a separate, working mac OS from an external hard drive in order to run disk utility and repair the MacBook's internal OS. The issue is, it has dismounted the internal Macintosh HD partition, and won't remount. And in addition to that, the Verify Disk option returns with, "The volume Macintosh HD appears to be OK." I've run Verify Disk and Repair Disk a few times, all with that same result. And the internal OS still won't boot.
I have attempted to make a disk image of the internal Macintosh HD partition and save it to my external hard drive so I can wipe the internal hard drive clean and restore the image, but I receive errors when trying to create the disk image, and when trying to erase the hard drive (I know, I should try to erase the hard drive when I haven't made an image. When I tried to erase the hard drive, the image wasn't done and I thought it was. I got an error for erase, and I got an error for making the disk image) I have tried making a disk image multiple times and haven't been able to create one.
There is also a boot camp partition on the internal hard drive which is of no importance as to whether it stays or is erased.

Reinstall OS X without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/.

I have to replace my hard drive as it is failing, I'm away and just bought a new external HD for backups,,only problem is it is fsiling to backup without a reason. Disk utility says ex HD is ok. I need to backup before i get it repaired. Any Advice?

Hi my hard drive is failing and I'm overseas in Thailand. I bought a Buffalo 1TB to back up my mac 13inch HD version 10.6.8, only problem is it wont back up. Disk Utility says ex HD is fine. I need to backup before I take it for repairs. What can I do? Thanks advice appreciated. NL

I think we both had our wires crossed a little.
Then just go ahead and clone your internal drive to your Buffalo. You are not going to use Time Machine, and you do not have to partition it. So ignore all that stuff I posted. Let me start from scratch.
First check that your Buffalo drive is partitioned GUID and formatted Mac OS Extended, Journaled. So open Disk Utility, select the topmost entry for the Buffalo drive. You should see something like this:
I have selected the entry of my CalDigit drive. Note that the Partition Map Scheme is GUID. Now, select the volume (mine is "System Backup."
Here you see it is a Format type of Mac OS Extended, Journaled. If that's what you see then you are good to go.
With Disk Utility still open:
Clone using Restore Option of Disk Utility
1. Open Disk Utility in the Utilities folder.
2. Select the destination volume from the left side list.
3. Click on the Restore tab in the DU main window.
4. Select the destination volume from the left side list and drag it to
the Destination entry field.
5. Select the source volume from the left side list and drag it to
the Source entry field.
6. Double-check you got it right, then click on the Restore button.
Destination means the Buffalo drive. Source means the internal startup drive.

My external drive won't mount. Disk Utility says it can't repair disk and to backup the disk and reformat, but how can I do that if it won't mount?

My external drive won't mount. Disk Utility says it can't repair disk and to backup the disk and reformat, but how can I do that if it won't mount?

See mount section in 1st linked article.
Disk Unmount Using Terminal
Disk Utility – Force Mount Disk

Time machine: An error occurred while copying files. The problem could be temporary. If the problem persists, use Disk Utility to repair your backup disk.

Time machine backups are failing. I've followed the instructions I found on the Time Machine troubleshooting page (http://pondini.org/TM/Troubleshooting.html) but have gotten to where I don't know what to do next.
Sequence of events:
The main error message is always:
An error occurred while copying files. The problem could be temporary. If the problem persists, use Disk Utility to repair your backup disk.
Yesterday, I opened Disk Utility and verified the disk. Got this error:
Error: This disk needs to be repaired using the Recovery HD. Restart your computer, holding down the Command key and the R key until you see the Apple logo. When the OS X Utilities window appears, choose Disk Utility.
I ran Disk Utility and repaired the hard drive. Then I manually started the backup before going to bed, figuring it was going to take a long time to run. When I got up this morning, the backup had failed with the same "could be temporary" error. I checked the log, which says:
Starting manual backup
Attempting to mount network destination URL: afp://Tery%20Griffin;[email protected]/Tery%20Griffin's%20Time%20Ca psule
Mounted network destination at mount point: /Volumes/Tery Griffin's Time Capsule using URL: afp://Tery%20Griffin;[email protected]/Tery%20Griffin's%20Time%20Ca psule
Disk image /Volumes/Tery Griffin's Time Capsule/Tery Griffin’s Computer (44).sparsebundle mounted at: /Volumes/Time Machine Backups
Backing up to: /Volumes/Time Machine Backups/Backups.backupdb
Event store UUIDs don't match for volume: Macintosh HD
Error: (-36) Applying backup protections to /Volumes/Time Machine Backups/Backups.backupdb/Tery Griffin‚Äôs Computer (44)/2014-03-05-201742.inProgress/ABB10CF2-F041-4DE5-B6AE-3C228B59ADCC
Error: (5) setxattr for key:com.apple.backupd.SnapshotStartDate path:/Volumes/Time Machine Backups/Backups.backupdb/Tery Griffin‚Äôs Computer (44)/2014-03-05-201742.inProgress/ABB10CF2-F041-4DE5-B6AE-3C228B59ADCC size:17
Error: (5) setxattr for key:com.apple.backupd.SnapshotState path:/Volumes/Time Machine Backups/Backups.backupdb/Tery Griffin‚Äôs Computer (44)/2014-03-05-201742.inProgress/ABB10CF2-F041-4DE5-B6AE-3C228B59ADCC size:2
Deep event scan at path:/ reason:must scan subdirs|new event db|
Finished scan
Found 145601 files (11.88 GB) needing backup
16.1 GB required (including padding), 620.77 GB available
Copied Zero KB of 11.88 GB, 0 of 145601 items
Copied 0 files (Zero KB) from volume Macintosh HD.
Copy stage failed with error:11
Backup failed with error: 11
Ejected Time Machine disk image: /Volumes/Tery Griffin's Time Capsule/Tery Griffin’s Computer (44).sparsebundle
Ejected Time Machine network volume.
Starting automatic backup
Attempting to mount network destination URL: afp://Tery%20Griffin;[email protected]/Tery%20Griffin's%20Time%20Ca psule
Mounted network destination at mount point: /Volumes/Tery Griffin's Time Capsule using URL: afp://Tery%20Griffin;[email protected]/Tery%20Griffin's%20Time%20Ca psule
Disk image /Volumes/Tery Griffin's Time Capsule/Tery Griffin’s Computer (44).sparsebundle mounted at: /Volumes/Time Machine Backups
Backing up to: /Volumes/Time Machine Backups/Backups.backupdb
Event store UUIDs don't match for volume: Macintosh HD
Error: (-36) Applying backup protections to /Volumes/Time Machine Backups/Backups.backupdb/Tery Griffin‚Äôs Computer (44)/2014-03-05-201742.inProgress/9F8E7957-9C50-49C3-8314-880E5203E3D9
Error: (5) setxattr for key:com.apple.backupd.SnapshotStartDate path:/Volumes/Time Machine Backups/
Does anyone know what the problem is here and what I should do?
Thanks,
Tery

You have repaired your boot drive (which is good) but have you repaired your time machine drive? I don't own a Time Capsule so I don't know if disk utility can operate on it. If it can, you should repair it as well. You may need to erase it and start a new backup. That happens to time machine volumes from time to time and is why people who are serious about their data never rely on a single source of backup.

Applications hang frequently. Disk Utility keeps repairing iTunes, system libraries and applications, but the next time I start my notebook, again applications hang

applications on my Macbook Pro 10.8.5 (8 GB) hang frequently. Disk Utility keeps repairing iTunes, system libraries and applications, but the next time I start my notebook, again applications hang. What do I do? Itunes, Preview window, Microsoft Office 11 are the programs with most frequent hangs.

HI again. installed and then uninstalled both Mackeeper and Blackberry with their software. Etrecheck still shows the same 'failed to load' error. Pasted below. Could you pls advise what is still going wrong? What am I missing? I donot seem to understand the detailed procedure of home/library etc for checking complete removal of clean my mac. Sorry to bother you and thank you a million times for your assistance!
Hardware Information:
          MacBook Pro (13-inch, Mid 2012)
          MacBook Pro - model: MacBookPro9,2
          1 2.9 GHz Intel Core i7 CPU: 2 cores
          8 GB RAM
Video Information:
          Intel HD Graphics 4000 - VRAM: 512 MB
Startup Items:
          GT Network Tuning - Path: /System/Library/StartupItems/GT Network Tuning
          NMPCCardDaemonVMC - Path: /System/Library/StartupItems/NMPCCardDaemonVMC
          NMPPPMonitor - Path: /System/Library/StartupItems/NMPPPMonitor
          Freecorder - Path: /Library/StartupItems/Freecorder
          HWNetMgr - Path: /Library/StartupItems/HWNetMgr
System Software:
          OS X 10.8.5 (12F45) - Uptime: 0 days 0:9:7
Disk Information:
          APPLE HDD HTS547575A9E384 disk0 : (750.16 GB)
                    disk0s1 (disk0s1) <not mounted>: 209.7 MB
                    Macintosh HD (disk0s2) /: 749.3 GB (225.09 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
          MATSHITADVD-R   UJ-8A8
USB Information:
          Apple Inc. FaceTime HD Camera (Built-in)
          Apple Inc. BRCM20702 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Computer, Inc. IR Receiver
          Apple Inc. Apple Internal Keyboard / Trackpad
FireWire Information:
Thunderbolt Information:
          Apple Inc. thunderbolt_bus
Kernel Extensions:
          com.rim.driver.BlackBerryUSBDriverInt          (0.0.97)
          com.rim.driver.BlackBerryVirtualPrivateNetwork          (1.0.15)
          com.silex.driver.sxuptp          (1.5.1)
Problem System Launch Daemons:
          [loaded] BkBackupScheduler.plist
Problem System Launch Agents:
Launch Daemons:
          [loaded] com.adobe.fpsaud.plist
          [not loaded] com.Affinegy.InstaLANd.plist
          [loaded] com.intego.BackupAssistant.daemon.plist
          [loaded] com.microsoft.office.licensing.helper.plist
          [loaded] com.oracle.java.JavaUpdateHelper.plist
          [loaded] com.rim.BBDaemon.plist
          [not loaded] com.rim.nkehelper.plist
          [loaded] com.rim.tunmgr.plist
          [loaded] org.macosforge.xquartz.privileged_startx.plist
Launch Agents:
          [failed] cn.com.zte.usbswapper.plist
          [loaded] com.Affinegy.InstaLANa.plist
          [loaded] com.intego.backupassistant.agent.plist
          [loaded] com.rim.BBLaunchAgent.plist
          [loaded] com.rim.blackberrylink.BlackBerry-Link-Helper-Agent.plist
          [loaded] com.rim.PeerManager.plist
          [not loaded] de.novamedia.NovamediaDiskSupressor.plist
          [loaded] org.macosforge.xquartz.startx.plist
User Launch Agents:
          [loaded] com.adobe.ARM.202f4087f2bbde52e3ac2df389f53a4f123223c9cc56a8fd83a6f7ae.plist
          [loaded] com.google.GoogleContactSyncAgent.plist
          [loaded] com.google.keystone.agent.plist
          [loaded] com.macpaw.CleanMyMac.helperTool.plist
          [loaded] com.macpaw.CleanMyMac.trashSizeWatcher.plist
          [loaded] com.macpaw.CleanMyMac.volumeWatcher.plist
User Login Items:
          None
3rd Party Preference Panes:
          Flash Player
          FUSE for OS X (OSXFUSE)
          Growl
          Java
Internet Plug-ins:
          AdobePDFViewer.plugin
          AdobePDFViewerNPAPI.plugin
          Flash Player.plugin
          FlashPlayer-10.6.plugin
          iPhotoPhotocast.plugin
          JavaAppletPlugin.plugin
          OfficeLiveBrowserPlugin.plugin
          QuickTime Plugin.plugin
          RL Secure Plug-In Layer.plugin
          SharePointBrowserPlugin.plugin
          Silverlight.plugin
User Internet Plug-ins:
          ContentManager.plugin
          RocketEngine.plugin
          UploadManager.plugin
Bad Fonts:
          None
Top Processes by CPU:
               2%          hidd
               2%          Safari
               1%          EtreCheck
               1%          fontd
               1%          PluginProcess
               1%          WindowServer
               0%          WebProcess
               0%          PeerManager
               0%          BBLaunchAgent
               0%          mDNSResponder
Top Processes by Memory:
          147 MB             WebProcess
          139 MB             Safari
          66 MB              mds
          57 MB              com.apple.dock.extra
          57 MB              CalendarAgent
          49 MB              Dock
          41 MB              BlackBerry-Link-Helper-Agent
          41 MB              Finder
          41 MB              WindowServer
          33 MB              PluginProcess
Virtual Memory Statistics
          5.69 GB            Free RAM
          1015 MB            Active RAM
          125 MB             Inactive RAM
          1.20 GB            Wired RAM
          244 MB             Page-ins
          0 B                Page-outs

HT3275 "The problem may be temporary. Try again later to back up. If the problem persists, use Disk Utility to repair your backup disk."

The problem may be temporary. Try again later to back up. If the problem persists, use Disk Utility to repair your backup disk.
what does this mean?? why can't i backup before i have to get my hard drive replaced?!!? arghh

brahr3 wrote:
I am getting the same error message: "The problem may be temporary. Try again later to back up. If the problem persists, use Disk Utility to repair your backup disk." I don't have a TC but rather an external drive, which is twice the size of my harddisc, and it still has plenty of free space. The problem has lasted for 5 days. I even used a different external drive -- still same error message. Needless to say that I have run Disc Utility several times. Can anybody help? Thanks
I am having issues with some USB drives on Mountain Lion.. work perfectly on another computer with Snow Leopard.. not even recognised by ML.
Is the disk recognised?
If so and TM cannot pick it up.. do a full reset of TM and try again.
A4 http://pondini.org/TM/Troubleshooting.html

Disk Utility says "drive can't be repaired, disk and restore your backed up files."

My Mac Book Pro froze yesterday and I had to force restart it. It had been showing me messages that my hard drive disk was full for a while and I was in the middle of transferring files to my external hard drive and I accidentally put a huge large file from my external hard drive into the trash on my laptop which makes me wonder if that means I added more GB to a computer that was already very full. Anyway, after freezing I restarted it and the desktop wouldn't load properly. The desktop picture was there, but folders on desktop did not appear, finder bar was missing and the dock was acting super slow and nothing worked when clicked on. Then the next few attempts were around the same result and eventually became stuck on the apple logo, spinning gear and a progress bar that was not loading at all.
Here's what I've tried so far:
Safe mode- nothing happens
Command + R - I am unsure how to work this since I can't seem to find an internet connection when it prompts for one. None of the internet connections have much signal and my own information doesn't seem to load since the gear spins to find the internet connection name and password I typed to load it but can't seem to find it. Perhaps I have the wrong internet information, but I don't think so.
I tried Command + S to use in single user mode and type in a command to help fix the drive, BUT, even though the black screen and white lettering mode did show up, it remained in a place where I was not allowed to type anything and the last thing written at the bottom of the screen was something about set up for bluetooth, I think. I tried this twice and both times it stopped in the same place and I could not type a command.
Disk Utility using installation dvd to verify and repair disk. Verify says disk needs repair and then repair has some red colored phrases: Invalid volume file count. (It should be 786374 instead of 786274) Incorrect number of thread records. And there was another problem listed but I do not remember it. Then, near the end of repairing it says: "Disk Utility stopped repairing Macintosh HD." It tells me it couldn't repair the disk and that I should back up as many of my files as possible, reformat the disk and restore backed up files.
That would be fine and dandy, but I have no idea how to back up my files and do all this. I have no idea how to exactly get the data off my hard drive. If someone does, please list a step by step guide for me on how to do so.
I have an external hard drive and I tried plugging in and selecting the hard drive and making a "New Image" to copy to the external hard drive destination, but it just stops a few seconds into it and tells me there is an input/output error. I tried read only, read/write only, compressed options for making a copy and all yield the same result.
In Disk Utility, I believe I have a partition -the Macintosh HD. I have listed on the left hand side: 320.07 GB Hitachi HTSS45.....etc. and below it in non-bolded, grey lettering it says "Macintosh HD."
The Hitachi, when clicked upon, shows the S.M.A.R.T. status as Verified and the Macintosh HD doesn't show much in details except for "Not mounted."
At one point, the Macintosh HD was in bold lettering and seemed to be mounted for a few minutes. When that happened, I was able to see the details reading: Mount Point: /Volumes/Macintosh HD, Capacity: 319.73 GB, Available: 11.92 GB, Used: 307.81 GB, etc.
I'm getting nervous to keep turning on and off the computer on force start and shut downs, especially since I have been reading up that the longer the computer is on, the more the hard drive is in use and the more chance for it to start deleting or overwriting my files. Is this true?
It's not mounted anymore since it was momentarily mounted. I just want to get my files off the disk and save them to my external hard drive. That is my main goal right now. What can I do?
Thank you in advance for your help!

If you want to preserve the data on the boot drive, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data, you can skip this step.
There are several ways to back up a Mac that is unable to fully boot. You need an external hard drive to hold the backup data.
1. Boot into Recovery (command-R at startup) or from a local Time Machine backup volume (option key at startup.) Launch Disk Utility and follow the instructions in the support article linked below, under “Instructions for backing up to an external hard disk via Disk Utility.”
How to back up and restore your files
2. If you have access to a working Mac, and both it and the non-working Mac have FireWire or Thunderbolt ports, boot the non-working Mac in target disk mode by holding down the key combination command-T at the startup chime. Connect the two Macs with a FireWire or Thunderbolt cable. The internal drive of the machine running in target mode will mount as an external drive on the other machine. Copy the data to another drive. This technique won't work with USB, Ethernet, Wi-Fi, or Bluetooth.
How to use and troubleshoot FireWire target disk mode
3. If the internal drive of the non-working Mac is user-replaceable, remove it and mount it in an external enclosure or drive dock. Use another Mac to copy the data.

Disk Utility says everything's fine, but Install disk doesn't find my internal drive as a possible destination. When I startup with Command S, I get a looping "cannot mount errno = 19" message.

Disk Utility says everything's fine, but Install disk doesn't find my internal drive as a possible destination. When I startup with Command + S, I get a looping "cannot mount errno = 19" message.
Problem started when I used Tech Tool Pro 6 to "de-fragment volume". Had to cancel that process before it finished because I ran out of time. Thereafter, when I startup my machine normally, I get the gray Apple logo at first, but it changes to a prohibited symbol (circle with a slash thru it) and hangs.
When I startup holding the Option key, I can see my internal drive, but I get the same results as above.
When I startup using the MacBook OSX Install DVD, it does not find my internal drive as possible destination.
When I startup using the MacBook OSX Install DVD and then run Disk Utility, it finds my drive, allows me to "repair" and says everything is fine.
When I startup with Command + S, I get a looping error message "errno = 19" and cannot stop it to do anything else.
When I startup from Disk Warrior v4.4, it does not find my internal drive to do any repairs.
When I startup from Tech Tool Pro 6 and run the "computer check" diagnostics, everything passes but the Volume Structure, which fails at "Volume Extents (B-tree)." When I use TTP's "Tools" option to run "volume repair" it will show my internal drive and allow me to click the GO button, but nothing happens and nothing changes.
I have a Time Machine backup on an external USB drive, but for as long as the internal drive doesn't mount, I can't use the backup to restore.

It's a false report and should be ignored.
I would not rely on TT as I've already said earlier even before Grant posted similar advice.
I really think the Rigid Disk Block may be corrupted. This holds the partition map and could prevent a volume from being unmounted. Unfortunately, there is no way to fix that without repartitioning the drive which will remove everything. So, before going down this road I hope you have backups or can make a backup.
Drive Partition and Format
1. Boot from your Snow Leopard Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Quit DU and return to the installer. Proceed with reinstalling OS X.
5. Download and install Mac OS X 10.6.8 Update Combo v1.1.

Disk utility says repaired but problem still comes back

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