Disk Utility verify of ISO burn fails, but md5 sum matches

Frequently when I burn a large DVD iso to a DVD, via the "Burn" task in OS X Disk Utility, the process results in a failure at the end of the verify process. However, if I check the md5 sum of the DVD against the published md5 sum for the ISO, the checksum matches. From this I assume that the DVD must have written correctly. Why does DiskUtility report that the verify failed?
System: IMac 27-inch, Mid 2011
OS X 10.9.5 (13F34)
Disk Utility: Version 13 (517)
Example: Here's the md5 sum of the downloaded ISO, which matches the published me5 sum for the ISO on the Centos website, and of the written DVD.
     # get md5 of downloaded ISO:
$ md5 CentOS-6.5-x86_64-bin-DVD1.iso
MD5 (CentOS-6.5-x86_64-bin-DVD1.iso) = 83221db52687c7b857e65bfe60787838
     # Centos site reports: 83221db52687c7b857e65bfe60787838 CentOS-6.5-x86_64-bin-DVD1.iso
     # read DVD via dd and pipe to md5 to get md5 sum:
$ dd if=/dev/disk2 | md5
8726528+0 records in
8726528+0 records out
4467982336 bytes transferred in 63.966136 secs (69849183 bytes/sec)
83221db52687c7b857e65bfe60787838
DVD was written via DiskUtility:
     1. File | Open ->select ISO from downloads folder
     2. Select ISO in left panel of Disk Utility
     3. insert blank DVD
     4. click Burn icon (pops up Burn Disc in: SuperDrive. Ready to burn.)
     5. click Burn
Result:
     dialog with "writing track"... "verifying" "Unable to burn "Centos....iso." (Verifying the burned data failed.)

its not your drive the problem its the disk if you use singapore produce disk there is a way to find out what kind of disk is made by you could have a disk of poor quality made by Ricoh, singapore disk dual layer disk of of top quality.
apple needs to update the firmware KA19 to be compatible to the Ricoh disk.

Similar Messages

Disk Utility verify or repair permission runs but doesn't indicate anything

Recently I ran Disk Utility to repair permissions after a software upgrade and the utility ran and ran, but no permissions were repaired and the utility didn't stop running. After an hour, I stopped running repair permissions. Does this indicate something remiss about the utility? Or worse? What should I do about this?

You might want to boot from your OS installer disk and launch Disk Utility. Repair Disk from there.

Disk Utility Unable to Correctly Burn Bootable Discs From ISO Files with Yosemite (10.10.1)

My problem is with burning ISO images to make a bootable DVD disc with OSX 10.10.1. I cannot drag and drop an ISO file (in this case, Ubuntu 14.04 server iso) to the disk utility and then burn it with Yosemite. I have to first open the ISO file, then attempt to burn it. The DVD it creates is unreadable. I tried to convert the ISO file to CDR and also IMG - same problem: disc unreadable error.
I then went back to OSX 10.9.5 and tried the same thing - worked like a champ. I was able to drag and drop the ISO file into the Disk Utility window and successfully burn a bootable DVD disc from the same Ubuntu ISO file I tried using with 10.10.1.
Hey Apple, what's up? You broke Disk Utility in 10.10.1. Has anyone experienced the same problem and found a work-around? I hate to have to keep booting an older version of OSX to accomplish this task. So far, Yosemite has been a bust for me with all the other problems I have experienced. I might as well go back to 10.9.5 on all my Macs until Apple gets their act together with Yosemite.

Apple doesn’t routinely monitor the discussions. These are mostly user to user discussions.
Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
Feedback
Or you can use your Apple ID to register with this site and go the Apple BugReporter. Supposedly you will get an answer if you submit feedback.
Feedback via Apple Developer

Disk Utility - Verify Disk Permissions / Repair

I run Disk Utility > Verify Disk Permissions with this rsult:
Verify permissions for “Macintosh HD”
Permissions differ on "usr/share/derby", should be drwxr-xr-x , they are lrwxr-xr-x .
The following repair was successful.
A few minutes later I run Verify Disk Permissions again with the SAME result:
Verify permissions for “Macintosh HD”
Permissions differ on "usr/share/derby", should be drwxr-xr-x , they are lrwxr-xr-x .
What does it mean and how can I stop this error?
Thanks!

There is nothing in that message that requires repairing. That is why it keeps showing up.
The permission database has to be updated every time the system is updated. If they miss a change that they have made in the system, it will get flagged as you see, but doesn't mean anything is wrong.
That KnowledgeBase article also must be updated to reflect the things they missed.
All that message is saying is that the directory derby is now replaced with a link to another directory (the l vs the d). However, mine doesn't have a link. Did you install anything that might have updated derby?
If you open Terminal and enter this code, can you post the line that has derby on it?ls -al /usr/share/
I'm repairing permissions now to see what pops up for me, but that will take a little while.
Edit: I looked into the Derby directory and Derby is a Relational Database Management System used by Apache. So, did you install something that modified Apache, PHP, mySQL or something like that? It might have altered the link.
Message was edited by: Barney-15E

Question on Disk Utility Verify

I have a two-week old 27" iMac, 1 TB SSD, 32 GB RAM, 1 4 GB RAID-0 external G-Drive (external Max OS drive), 2 4 GB external G-Drives (1 used as partitioned backup (1 TB for Boot Camp, 3 TB for Time Machine), 1 planned for Windows external drive). I also bought and installed the Paragon NTFS and CampTune applications.
Have setup Boot Camp on the internal 1 TB SSD (127 GB partition) and finally got things to work, but, I am continually having issues with WIndows crashing (either in the middle of use, or during startup or shutdown with the KERNEL_SECURITY_CHECK_FAILURE. I have been Googling, and this seems associated with the use of external drives?
The last time I got this, I was unable to boot back into Mac partition, and ended up having to hold down the Option Key at boot, and select the right partition to boot from, I then started verifying all my drives and paritions with Disk Utility, and was finding and repairing various issues (everything seemed to repair fine) and also the Mac HD partition seemed to have Permissions issues, which seemed to repair fine.
But, in the process of doing this, am noticing an issue, or at least a difference between the Mac HD and and the External Mac-formatted Verify logs. The External drive ALWAYS tells me the drive is good, while the Mac HD has done that only once, and usually seems just to stop with "Checking Volume Information" as the last entry. Not sure this is an issue, or not, but was looking for ANY cause for the continual Windows issue.
Disk Utility Log Dumps are below, first the internal Mac HD (two partitions, Mac and Boot Camp, checking only the Mac partition), second the External G-Drive, formatted Mac RAID HD. Both times, I am selecting the drive partition below the actual physical HW.
The Boot Camp partition checks good.
Thanks.
2014-06-15 01:54:28 -0600:
2014-06-15 02:16:43 -0600: Verifying volume “Macintosh HD”
2014-06-15 02:16:43 -0600: Starting verification tool:
2014-06-15 02:16:43 -0600: Checking file system
2014-06-15 02:16:44 -0600: Performing live verification.
2014-06-15 02:16:44 -0600: Checking Journaled HFS Plus volume.
2014-06-15 02:16:44 -0600: Checking extents overflow file.
2014-06-15 02:16:50 -0600: Checking multi-linked files.
2014-06-15 02:16:51 -0600: Checking catalog hierarchy.
2014-06-15 02:16:59 -0600: Checking extended attributes file.
2014-06-15 02:17:01 -0600: Checking volume information.
2014-06-15 02:17:01 -0600: Repair tool completed:
2014-06-15 02:17:01 -0600:
2014-06-15 02:18:21 -0600: Verifying volume “G-RAID with Thunderbolt”
2014-06-15 02:18:21 -0600: Starting verification tool:
2014-06-15 02:18:21 -0600: Checking file system
2014-06-15 02:18:21 -0600: Checking Journaled HFS Plus volume.
2014-06-15 02:18:21 -0600: Checking extents overflow file.
2014-06-15 02:18:21 -0600: Checking catalog file.
2014-06-15 02:18:23 -0600: Checking multi-linked files.
2014-06-15 02:18:23 -0600: Checking catalog hierarchy.
2014-06-15 02:18:23 -0600: Checking extended attributes file.
2014-06-15 02:18:25 -0600: Checking volume bitmap.
2014-06-15 02:18:25 -0600: Checking volume information.
2014-06-15 02:18:25 -0600: The volume External_1 appears to be OK.
2014-06-15 02:18:26 -0600: Repair tool completed:
2014-06-15 02:18:26 -0600:
2014-06-15 02:28:20 -0600: Verifying volume “BOOTCAMP”
2014-06-15 02:28:20 -0600: Starting verification tool:
2014-06-15 02:28:20 -0600: Checking file system
2014-06-15 02:28:20 -0600: Checking Volume /dev/disk1s4...
2014-06-15 02:28:20 -0600: Type of the filesystem is NTFS.
2014-06-15 02:28:20 -0600: Volume label is: BOOTCAMP.
2014-06-15 02:28:21 -0600: Verifying 9820 file(s) with EAs...
2014-06-15 02:28:28 -0600: $UpCase file is formatted for use in Windows 7/8/8.1.
2014-06-15 02:28:28 -0600:      51.90 GB in 87120 files.
2014-06-15 02:28:28 -0600:      65860 KB in 22860 directories.
2014-06-15 02:28:28 -0600:          0 KB in bad blocks in 0 fragments.
2014-06-15 02:28:28 -0600:     231124 KB in use by the system.
2014-06-15 02:28:28 -0600:         64 MB occupied by the log/journal file.
2014-06-15 02:28:28 -0600:          4 KB in each allocation unit.
2014-06-15 02:28:28 -0600:   31175679 total allocation units on volume (118.93 GB).
2014-06-15 02:28:28 -0600:   17488312 allocation units available on volume (66.71 GB).
2014-06-15 02:28:28 -0600: No repairs were necessary for volume /dev/disk1s4.
2014-06-15 02:28:28 -0600: Repair tool completed:
2014-06-15 02:28:28 -0600:

Do a backup. Boot to the Recovery Volume (command - R on a restart or hold down the option key during a restart and select Recovery Volume). Run Disk Utility Verify/Repair and Repair Permissions until you get no errors. See if the internal drive checks good.
OS X Recovery
OS X Recovery (2)

Disk utility verify comes back with a errors.

I am running Mac OS X 10.5.8.
When I run the disk utility verify it comes back with a message saying that it cannot repair the errors found on the drive. I also get msgs that the file counts and directory counts are not what they are supposed to be.
What do you recommend I do? Are these errors serious or should I ignore them. I only noticed these errors yesterday after my computer would not boot. I had to actually take out the power cord from the back of the computer and hold the power buttom down for 20 secs and then reattach the power cord. Only then did it boot again.
I am thinking about doing a complete reinstall from scratch however, there may be a chance that some other disk utility out there can fix my problems....any ideas?
Thanks in advance for your help.

Since your system is having trouble booting, you should probably fix those errors.
When Disk Utility can't repair a problem, you have some choices. Many people buy Disk Warrior or TechTool Pro, with Disk Warrior the preferred program, to fix those sort of errors, assuming they aren't caused by failing hardware. Those sound like 'soft' errors that Disk Warrior can repair (see their web site).
If you want to check your hard drive hardware, you can run the Apple hardware test (run the extended test), and SMART Utility is another program that will give you insights into the health of the hard drive.
If you have a good backup, another option is to boot to an OS X DVD (or a bootable backup), use Disk Utility to erase the hard drive and write zero's to it, then restore your backup. If you go this route, make sure you have a good backup because you'll be erasing, permanently, everything on your hard drive.

My MacBook pro won't recognize hard drive I put in it. It boots only to a white screen unless I boot to my recovery USB. If I do that then I can select my USB and my external time machine drive in the disk utility, so no problems there. But what do you

My MacBook pro won't recognize hard drive I put in it. It boots only to a white screen unless I boot to my recovery USB. If I do that then I can select my USB and my external time machine drive in the disk utility, so no problems there. But what do you think it is? It won't recognize any hard drive I put in the machine, so might it be the sata cable?

Boot the Recvoery USB, use Disk Utility to select the internal drive makers namea and size on the left.
Now select erase and select the midde option and click erase, it will take a bit to complete but it's best for the drive.
Now select Partiton tab, click the big box and Options: GUID and then Format: OS X Extended journaled and click apply.
Quit and you should be able to install OS X now with your Apple ID and password.
see
http://osxdaily.com/2011/08/08/lion-recovery-disk-assistant-tool-makes-external- lion-boot-recovery-drives/

When I run disk utility, verify permissions I get "WARNING SUID file system/Library/Coreservices/Remotemanagement/ARDAgent.app/Contents/MacOS/ARDAge nt has been modified

When I run disk utility, verify permissions I get "WARNING SUID file system/Library/Coreservices/Remotemanagement/ARDAgent.app/Contents/MacOS/ARDAge nt has been modified

Please read Disk Utility's Repair Disk Permissions messages that you can safely ignore.
Roger

I've tried to conduct a secure erase with disk utility. I highlight the drive but erase options are not available.

I tried to conduct a secure erase with disk utility. I highlight the drive but there's no place to click "erase."

If you have an SSD, then the best thing you can do it enable System Preferences -> Security -> FileVault, so that any deleted files are just an encrypted jumble of bits to anyone that does not have the encryption key.
And even if you do erase the SSD, it does not work the way you think, and retired SSD zones may have your data, and never see an erase.
This is way keeping the SSD encrypted means retired zones are just encrypted jumble of bits.
If you do NOT have an SSD, is it possible you are trying to erase your boot disk while you are actually using your boot disk? Disk Utility will not allow you to do that either.

EMac G4 fails Disk Utility Verify

My eMac has been "on the shelf" since November. I drowned my "new" (rebuilt) iMac's HD so have taken the e out for a rescue mission. It seemed exceptionally slow with a few other quirks so I did a Disk Utility on the Volume HD as well as the HD itself and got this:
Verifying volume “HD X10.4.11”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Checking multi-linked files.
Checking Catalog hierarchy.
Checking Extended Attributes file.
Checking volume bitmap.
Checking volume information.
Volume Header needs minor repair
d.",1)
HD X10.4.11
Error: The underlying task reported failure on exit
1 HFS volume checked
Volume needs repair
Any help would be greatly appreciated.
...........goldie

If you have the Install Disc handy...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.
Other way...
Does it boot to Single User Mode, CMD+s keys at bootup, if so try...
/sbin/fsck -fy
Repeat until it shows no errors fixed.
(Space between fsck AND -fy important).
Resolve startup issues and perform disk maintenance with Disk Utility and fsck...
http://docs.info.apple.com/article.html?artnum=106214

Disk Utility DVD+R DL Burn Error..Please Help

I am trying to burn my backup image of Retail OS X Leopard 10.5.6 onto a DVD+R DL so that I can re-format my macbook because I have been experiencing some issues lately. The image is verified but about half way through the disk writing process, it says that it is finishing the burn, closing the disk, and than I get an error.
I have tried to burn the image on 2 different brands of disks wondering if that may be the issue (Verbatim and Memorex), but I am still having problems. My macbook is about a year old so I'm hoping that its not a hardware issue because the drive works for everything else.
I'm hoping that someone can help me figure out how to get the leopard image on a dvd since disk utility is not working properly. I also have an external usb hard drive, but I'm not sure if I can use that to boot my macbook with??
Here is the disk utility log excerpt:
2009-08-31 19:25:53 -0700: Disk Utility started.
2009-08-31 19:31:50 -0700: Burning Image “Mac OS X Install DVD.dmg”
2009-08-31 19:31:57 -0700: Image name: “Mac OS X Install DVD.dmg”
2009-08-31 19:31:57 -0700: Burn disc in: “HL-DT-ST DVDRW GSA-S10N”
2009-08-31 19:31:57 -0700: Erase disc before burning: No
2009-08-31 19:31:57 -0700: Leave disc appendable: No
2009-08-31 19:31:57 -0700: Verify burned data after burning: Yes
2009-08-31 19:31:57 -0700: Eject disc after burning
2009-08-31 19:31:57 -0700:
2009-08-31 19:31:57 -0700: Preparing data for burn
2009-08-31 19:33:23 -0700: Opening session
2009-08-31 19:33:31 -0700: Opening track
2009-08-31 19:33:31 -0700: Writing track
2009-08-31 19:46:35 -0700: Finishing burn
2009-08-31 19:47:35 -0700: Closing session
2009-08-31 20:03:20 -0700: Finishing burn
2009-08-31 20:03:26 -0700: Burn failed
2009-08-31 20:03:26 -0700: The device failed to respond properly, unable to recover or retry.
2009-08-31 20:03:26 -0700: Additional information can be found in the ~/Library/Logs/DiscRecording.log log file.
2009-08-31 20:03:26 -0700: Unable to burn “Mac OS X Install DVD.dmg”. (The device failed to respond properly, unable to recover or retry.)
2009-08-31 20:03:26 -0700:
Thanks!!!

Ok I have been experiencing the same issue when trying to create a back up copy of my retail version of MAC OSX Leopard. What I have finally figured out is that you need to create the copy from a image with a .cdr extension. I don't know the details but it works. I blew through too many DVD+R DL disk than i am comfortable with.. they're **** expensive. So this is what I did:
-First create a new image with the disk utility app in your Utilities folder.
-under the format drop down menu, choose "Master DVD, CD". Encryption set to None.
-after you have created the image, then go back to Disk Utility and select the .cdr image that you just created and select Burn. Place a DVD dual layer into the mac and i chose the slowest burn speed.. (2.4). it should burn flawlessly.
Good Luck and hope that helps!

Disk Utility Verify Weirdness

My wireless mighty mouse started acting erratic again today. The Bluetooth 2.0 update from a few weeks back seemed to fix this problem for a good 10 days or so but unfortunately, the erratic mouse problem is back. So I ran some tests on my hard drive. I ran TechTool Deluxe 3.1.2 from my extended AppleCare package. I tested the drive hardware, did a format check and directory scan, surface scan and tested the processor and RAM. No problems were found.
I restarted after this and then ran Disk Utility and repaired permissions. Then I did a "Verify Disk" with Disk Utility and the progress bar (barber shop pole) stopped spinning part way in (it almost looked like it was locked up) and I got a spinning beach ball and couldn't click anywhere on the desktop. The verify disk procedure eventually completed and no problems were found. So out of curiosity, I tried this again and the exact same thing happened. So I did a Safe Boot and ran Disk Utility once more, then restarted again and now Disk Utility seems to work normally again.
I also tried a free utility today called SMARTReporter 2.3.9 and I wasn't too impressed with it (no comparison to Smart Utility 2.0.2). SMARTReporter claims to be compatible with 10.5.
So I wonder what happened and why Disk Utility locked up on me? Is TechTool Deluxe 3.1.2 at fault here? I wonder if it is even compatible with Mac OS X 10.5.7 since it hasn't been updated in about a year and a half now (since 02/08/08) - what's up with Micromat? Or perhaps SMARTReporter 2.3.9 isn't so smart after all? I tried running Disk Utility on our PowerBook G4 running Mac OS X 10.4.11 and I noticed that the barber shop pole also stops spinning part way through a verification so maybe I just haven't noticed this close enough before?
Any ideas, advice or help would be appreciated - things seem to be okay now but I'm a bit worried about my hard drive.
Thanks,
Gerard

Thanks for letting me know everything is A-OK with the boot device issue. I think the startup disk was deselected because I reset the PRAM. Regarding the erratic mouse, I still have this problem and it is driving me insane - I've got a replacement coming from Apple. It must be defective. I keep seeing these errors in the system log:
Jun 21 11:55:53 <my computer> kernel[0]: IOHIDSystem: Seize of IOHIDPointing failed.
Jun 21 11:55:53 <my computer> kernel[0]: IOHIDSystem: Seize of IOHIDEventDriver failed.
And this error started only after updating to 10.5.7 from 10.5.6:
Jun 21 11:59:32 <my computer> kernel[0]: IOHIDSystem::relativePointerEventGated: Capping VBL time to 20000000 (was 34304537)
My whole system just feels generally "flaky" right now. I'm assuming these are related to the mouse. I've been getting them for months. What is the best way to test your system - with Disk Utility or is there a special TechTool Deluxe test I should run (surface scan, directory scan, volume structure, etc.)?
Thanks again,
Gerard

Disk utility verify failure

I had system 10.4.11 and I was installing system 10.5 because my mac wasn't starting up anymore, the wheel keep on spinning under the apple logo.
Before installing the Os 10.5, i went to Disk Utility from Installation DVD to try to repair the startup disk, but it couldn't verify or repair it.
Since then, i can install the new system only by initialize and install everything, i can no longer just update the old system.
So, now i need to access my disk to backup my data.
I tried to startup the Macbook pro in firewire target Target disk mode to backup my data, and the firewire logo appears on my macbook but the disk doensn't appear on the linked mac. If i have system 10.5 installation dvd on, it will appear on linked mac properly.
The weird thing is that starting up in target mode without the dvd, a System 10.5 style firewire logo still appears, (with Leopard style battery indicator).
Is there any other way i can access to my disk?

You need to boot from the install DVD (or a clone of your internal) to run Repair Disk. Repair Disk will be grayed out, dimmed, because you can't repair from the same volume you are booted from.
EDIT: No, you do not yet need to use Disk Warrior or Tech Tool or do any reformatting. These steps might become necessary only if Repair Disk fails.
Unless you have very large video files, for example, there is no need to run any defragmenting utility. OS X does it all by itself on the fly.
Try Disk Utility
Start from your Mac OS X Install disc: Insert the installation disc, then restart the computer while holding the C key.
When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
Click the First Aid tab.
Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
Select your Mac OS X volume.
Click Repair. Disk Utility checks and repairs the disk.
If you don't have the install DVD, try a Safe Boot. Hold the Shift key down at startup and give it much more time to boot than usual. It's trying to repair the drive directory.
Message was edited by: WZZZ

Disk utility verify drive error

When I run disk utility I receive the following error. In reading previous posts I discoverd that I needed to use the OSX install disk. So I get it showing in the utilities window on the left side and attempt to get disk utility running by following this path on the disk -- Applications > Utilities > Disk Utility. Double clicking disk utility has no result.
Any suggestions would be appreciated.
The error when running verify disk from disk utility on the iMac:
Verifying volume “Macintosh HD”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Invalid node structure
The volume Macintosh HD needs to be repaired.
Error: The underlying task reported failure on exit
1 HFS volume checked
Volume needs repair

As Doug has said, & indeed you have tried....you need to run diskutility from the OS install disk. Or more accurately, you need to run diskutility when booted from the install disk.
The following ( from diskutility help) should explain it clearly.
Start up your computer using another disk.
To use the Install Mac OS X disc, insert the disc and restart your computer holding down the Option key, then select the Install Mac OS X disc and click the arrow.
Open Disk Utility.
If you're using the Mac OS X Install disk, follow the onscreen instructions until the menu bar appears with the Utilities menu in it., and then choose Utilities > Open Disk Utility.
Select the startup disk in the list of disks and volumes, then click First Aid.
Check the S.M.A.R.T. Status at the bottom of the window. If you can't see it, be sure you selected the hard disk your volume is on, and not the volume itself.
If the S.M.A.R.T. Status is "About to Fail," back up your files on the disk as soon as possible and replace the disk.
If the S.M.A.R.T. Status is "Verified" or "Not supported," click Repair Disk to repair the disk.
If Disk Utility tells you to look for links to corrupt files in the DamagedFiles directory, two or more files occupy the same space on your hard disk and at least one of them is likely to be corrupt. Examine each affected file in the DamagedFiles folder, which at the top-level of the affected disk. If you can replace it or recreate the file, delete it. If it contains necessary information, open it and examine its data to make sure it has not been corrupted.
If Disk Utility reports "The underlying task reported failure," Disk Utility encountered a problem it could not repair. Back up as much of your data as possible, reformat your disk, reinstall Mac OS X, and restore your backed up data.

Disk Utility, Verify Disk & Repair Disk unavailable

Hi there!
I want to check my Hard Disk with Disk Utility, but none of the two buttons (Verify Disk & Repair Disk) are available, I started up from my Mac OS X installation disc, and once, it told me that the disk had errors and needed to backup my files, so I went back and backed up with Time Machine, then out of curiosity went again and I started up from my Mac OS X installation disc, and this time it told me that the disk was fine and there wasn't any errors, but when I open Disk Utility with my Mac, none of the buttons are available, is this normal?
What should I do?
Context: Before all this, I installed a program called Tuxera to create a NTFS partition but my Mac started to act weird, so I deactivate and uninstalled this program, that's when I went to verify the disk.
Any Help would be gratefully appreciated

I hope I'm wrong but it sounds very much like Tuxera did something to your startup disk. I would also be somewhat concerned about the integrity of any Time Machine Backups you made after you ran Tuxera.
The safest thing to do would be to start up from your Snow Leopard disk and see if you can *restore your system and data from your Time Machine backups to an +external HD+* formatted using Mac OS Extended (Journaled) and GUID Partitioning. Formatting will erase all the data on that disk. *If you try to restore to the internal and it doesn't work you will probably lose most of your data.*
Startup your Mac using the external and check very carefully to see that you have all your data and that everything works as it should. If it does you can safely reformat your internal drive from Disk Utility on the Leopard disk using Mac OS Extended (Journaled) and GUID Partitioning. After that you can clone the external drive to your Mac's internal drive or install from the Time Machine backups.
If the Time Machine backup doesn't work you will need to run a disk data recovery utility to see if you can salvage your data from your internal drive.
I don't use PC's so someone may be along with much better advice. However, unless and until someone more knowledgeable about PC file formats comes along to help *don't reformat your internal drive until you know your Time Machine backups are OK.*

Disk Utility verify of ISO burn fails, but md5 sum matches

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