Disk utility can't repair external hard drive

A couple months back, I had to get a whole new hard drive case for my external because the power cord broke. Anyway, It's worked fine until now...
The hard drive doesn't show up with the other volumes.
It does show up on Disk Utility. When I try to repair or verify the drive, it works up until the end, but then it automatically quits and it says this:
Verifying volume “FIREWIRE”
** /dev/disk1s1
** Phase 1 - Read FAT
** Phase 2 - Check Cluster Chains
** Phase 3 - Checking Directories
Unable to read directory (Input/output error)
Error: The underlying task reported failure on exit
1 non HFS volume checked
Volume needs repair
Anyway, I have 45GB of music as well as movies and photographs that mean a lot to me so I hope I don't have to erase the drive or anything...
Thanks to anyone who helps me out.

Hmm, I can't seem to find anything on Windows (XP) that will fix my exact problem...
Then again, I am the crappiest Windows user ever so, once again, any help would be great.
I searched "disk repair" on the help and support center, and it gave me a bunch of ways to fix the drive depending on the problem. The thing is, none of the problems seemed to match mine...
Your personal data files are missing or have been corrupted, or you want to revert to a previous version of a file.
After updating a device driver, you can log on, but the system is unstable.
After installing a new device, the system is unstable.
Changes made to your system or application settings are causing your computer to run poorly and you do not know how to restore the previous settings.
After installing an application, the system is unstable or an application is not working properly.
Operating system does not start (the logon screen does not appear)
I'm not really sure what the exact problem is, I just know that it isn't working on the Mac, but it is on the PC.

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Disk utility can't find iMac hard drive

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Oh Gosh, I am having this same problem too. I normally do not shut down ever, I reboot often because I have to due to bad wireless reception. Last month, I did a full shut down and unplug due to a terrible storm coming in. When I went to boot up, it took very long and I had booted from my external bootable drive. My saving grace is that since crashing my emac in 2006, I am a rabid "backerupper" (made up my own word). I have been using lacie’s Silverkeeper to make bootable back ups just in case. So When I tried disk utility, it did not see my drive. I used my third party software "Disk Warrior" by Alsoft, it saw my drive, and then I unplugged my external and then booted again from the Snow Leopard DVD and was able to repair. All was well until this weekend. We had a storm come trough quickly and we lost power, now I have the same problem you do but this time Disk Warrior does not see the disk either. I am going to dig around for a while before I hit the Genius bar. I fear the drive is fried. And for me I am not certain this will be worth the dollar amount to replace since this is a 2006 and not upgradeable, but I will check with an outside vendor for price for the drive so I know what I want to do if in fact the Genius bar cannot see the drive either. I do hope you have a back up version, and would suggest having third party software to take a chance to see if you can find your disk. My imac is an Intel duo core 2 GHZ and from what I can tell model number A1174. To get help from the smart people here it would be useful for you to post the rest of your specs. If you don't know the exact model, you can check everymac.com and plug in your serial number. Under the computer stand you will find the serial number and the emc number and you can find out from everymac.com what exact model you have. If I find anything I will come back to this thread and report in. Good luck to you.

Desktop or Disk Utility won't show External Hard Drives

The Desktop or Disk Utility won't show 2 of my old external hard drives and so they are currently unsusable. My computer however recognise other external drives.
320GB Western Digital MyBook Premium model number: WD3200D032-000
500 GB Western Digital MyBook Premium model number: WD5000E032
I have same issues both of these external drives.
The blue circle lights come on so power is getting to it.
Tried 2 USB cables, one I know for sure is working - Nothing.
I am using Lion 10.7.4 on a mid 2009 13" MacBook Pro
All efforts to help much appreciated

No they haven't worked on this computer before. I using them on my old MacBook Pro (a computer which is no longer working) which ran Snow Leopard.
The 500GB drive "stopped working" with that old MBP too
But the 320GB drive was always working with old MBP if I remember correctly.
Cheers

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Nothing at all, Tony. When I came back to work on my computer after a 30-minute break, one of the applications was frozen. Soon after, everything froze. After restarting, the flashing question mark came up. I was able to boot from CD but when I tried to run disk utility it wouldn't find the hard drive. At this point I'm at a loss and I'm worried about my data, which, as it happens, I hadn't stored elsewhere! Any suggestions?

PowerBook G4 can't see external hard drive

All of a sudden, my PowerBook G4 can no longer see my external hard drive (Maxtor 160 GB drive). The drive doesn't appear in the Finder, and it doesn't mount on the desktop. Thus, I have no way of accessing the files on my external hard drive.
I can see the external hard drive when I launch Disk Utility (and also when I launch TechTool Pro), so I know the hard drive and the USB connections are working.
Can someone please help on this?? I've tried unplugging everything and rebooting with no results. Thank you.
PowerBook G4 Titanium 1ghz processor Mac OS X (10.4.2)
PowerBook G4 Titanium 1ghz processor Mac OS X (10.4.2)

Everything looks clean, as far as I can tell.
Disk Utility says:
"The volume External Hard Drive appears to be OK.
Mounting Disk.
1 HFS volume checked.
No repairs were necessary."
TechTool Pro volumes test says:
Volume Structures
Thursday, March 29, 2007 6:24:26 PM US/Pacific
Passed
Volume: External Hard Drive
Mount Point: /dev/disk1s3
Format: HFS+ (Mac OS Extended)
Journaling: Enabled
Case-sensitive: No
Created: 03/26/07 01:26:09 AM
Modified: 03/26/07 01:26:09 AM
Capacity: 152.54 GB
Used: 49.81 GB
Available: 102.74 GB
Files: 86,074
Folders: 16,342
Writable: Yes
Ejectable: No
Removable: No
There are a variety of invisible files, settings, and parameters that the Macintosh file system uses to locate files, free disk space, and for other maintenance and management routines. Damage to these critical data structures can result in lost or damaged files and may even necessitate a complete reformat of the volume.
Precheck Structures
This test checks the readability of the various volume structures.
Boot Blocks
This test validates the Boot Blocks portion of the volume. This block of data is created when the volume is blessed.
Boot Blocks <Passed>
Master Directory Block
This test validates the Master Directory Block portion of the volume. This block of data is created when the volume is created and contains important data about the rest of the volume.
Master Directory Block <Passed>
Volume Header
This test validates the Volume Header portion of the volume. This block of data is created when the volume is created and contains important data about the rest of the volume like number of files and folders, and the amount of free space available on the volume.
Volume Header <Passed>
Allocation File (Bitmap)
This test checks the Allocation file. This file indicates which blocks are allocated for use and which blocks are free.
Allocation File (Bitmap) <Passed>
Extents File (B-Tree)
This test checks the Extents file. This file contains the extent data for the entire volume. Extents are the separate components of a fragmented file.
Extents File (B-Tree) <Passed>
Catalog File (B-Tree)
This test checks the Catalog file. This file keeps track of all the files and folders on the volume.
Catalog File (B-Tree) <Passed>
Attributes File
This test checks the Attributes file. This file tracks all of the attributes of each file and folder on a volume. Some attributes include whether the file is locked or not and the last time the volume was backed up.
Attributes File <Passed>
Startup File
This test checks the Startup file. The parameters within this file contain the information used by the computer ROM to determine what program will boot the computer as well as other system-specific aspects.
Startup File <Not Present>
Completed
Passed
Tech Tool Pro File structure says:
File Structure
Thursday, March 29, 2007 6:30:25 PM US/Pacific
Passed
Volume: External Hard Drive
Mount Point: /dev/disk1s3
Format: HFS+ (Mac OS Extended)
Journaling: Enabled
Case-sensitive: No
Created: 03/26/07 01:26:09 AM
Modified: 03/26/07 01:26:09 AM
Capacity: 152.54 GB
Used: 49.81 GB
Available: 102.74 GB
Files: 86,074
Folders: 16,342
Writable: Yes
Ejectable: No
Removable: No
This test checks for file resource corruption on the volume 'External Hard Drive'. If any damaged files are found, TechTool Pro will let you know which files have corrupted resources.
Analyzing File Structures
Passed
I'll let you know if Tech Tool Pro's surface scan of the drive turns anything up (it's running right now - takes several hours to run), but hopefulyl this provides a good starting point into painting a picture of my system...
Thx - Bob

Finder can't see external hard drive

All of a sudden, my PowerBook G4 can no longer see my external hard drive (Maxtor 160 GB drive). The drive doesn't appear in the Finder, and it doesn't mount on the desktop. Thus, I have no way of accessing the files on my external hard drive.
I can see the external hard drive when I launch Disk Utility (and also when I launch TechTool Pro), so I know the hard drive and the USB connections are working.
Can someone please help on this?? I've tried unplugging everything and rebooting with no results. Thank you.
PowerBook G4 Titanium 1ghz processor Mac OS X (10.4.2)

By the way, here are my test results from running Disk Utility and Tech Tool Pro. Everything looks clean, I think?
Disk Utility says:
"The volume External Hard Drive appears to be OK.
Mounting Disk.
1 HFS volume checked.
No repairs were necessary."
TechTool Pro volumes test says:
Volume Structures
Thursday, March 29, 2007 6:24:26 PM US/Pacific
Passed
Volume: External Hard Drive
Mount Point: /dev/disk1s3
Format: HFS+ (Mac OS Extended)
Journaling: Enabled
Case-sensitive: No
Created: 03/26/07 01:26:09 AM
Modified: 03/26/07 01:26:09 AM
Capacity: 152.54 GB
Used: 49.81 GB
Available: 102.74 GB
Files: 86,074
Folders: 16,342
Writable: Yes
Ejectable: No
Removable: No
There are a variety of invisible files, settings, and parameters that the Macintosh file system uses to locate files, free disk space, and for other maintenance and management routines. Damage to these critical data structures can result in lost or damaged files and may even necessitate a complete reformat of the volume.
Precheck Structures
This test checks the readability of the various volume structures.
Boot Blocks
This test validates the Boot Blocks portion of the volume. This block of data is created when the volume is blessed.
Boot Blocks <Passed>
Master Directory Block
This test validates the Master Directory Block portion of the volume. This block of data is created when the volume is created and contains important data about the rest of the volume.
Master Directory Block <Passed>
Volume Header
This test validates the Volume Header portion of the volume. This block of data is created when the volume is created and contains important data about the rest of the volume like number of files and folders, and the amount of free space available on the volume.
Volume Header <Passed>
Allocation File (Bitmap)
This test checks the Allocation file. This file indicates which blocks are allocated for use and which blocks are free.
Allocation File (Bitmap) <Passed>
Extents File (B-Tree)
This test checks the Extents file. This file contains the extent data for the entire volume. Extents are the separate components of a fragmented file.
Extents File (B-Tree) <Passed>
Catalog File (B-Tree)
This test checks the Catalog file. This file keeps track of all the files and folders on the volume.
Catalog File (B-Tree) <Passed>
Attributes File
This test checks the Attributes file. This file tracks all of the attributes of each file and folder on a volume. Some attributes include whether the file is locked or not and the last time the volume was backed up.
Attributes File <Passed>
Startup File
This test checks the Startup file. The parameters within this file contain the information used by the computer ROM to determine what program will boot the computer as well as other system-specific aspects.
Startup File <Not Present>
Completed
Passed
Tech Tool Pro File structure says:
File Structure
Thursday, March 29, 2007 6:30:25 PM US/Pacific
Passed
Volume: External Hard Drive
Mount Point: /dev/disk1s3
Format: HFS+ (Mac OS Extended)
Journaling: Enabled
Case-sensitive: No
Created: 03/26/07 01:26:09 AM
Modified: 03/26/07 01:26:09 AM
Capacity: 152.54 GB
Used: 49.81 GB
Available: 102.74 GB
Files: 86,074
Folders: 16,342
Writable: Yes
Ejectable: No
Removable: No
This test checks for file resource corruption on the volume 'External Hard Drive'. If any damaged files are found, TechTool Pro will let you know which files have corrupted resources.
Analyzing File Structures
Passed
I'll let you know if Tech Tool Pro's surface scan of the drive turns anything up (it's running right now - takes several hours to run), but hopefulyl this provides a good starting point into painting a picture of my system...
Thx - Bob

External Hard Drive Disk Utility Can't Repair the Disk

Hi,
I have a Seagate 1 TB Backup Plus Drive which was working perfectly fine until I plugged it into a USB hub. It detected it while in the hub and I was able to get files off of it, but when I ejected it from the hub and put it back into the USB slot on the computer it was not detected by finder. It shows up in the disk utility and I clicked verify and repair and it says:
Verify and Repair volume “Seagate Backup Plus Drive”
Checking file system
Volume repair complete.
Updating boot support partitions for the volume as required.
Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.
Is there any way to get this to work properly again? Or if not is there a way for me to recover my files on the external hard drive?
Thanks
I have a Macbook PRO late 2011 running OS X Mavericks.

Use a more powerful utility such as DiskWarrior, or a product such as those listed here.
(108710)

Disk utility can't repair a partition on external hard drive

I have a 1TB Western Digital external FW drive that's only a couple years old (2 or 3, probably). I have it split into partitions, one of which I'm using for Time Machine. The non-Time Machine partition checked out fine with DIsk Utility, but when I ran Disk Utility on the Time Machine partition, I received this message:
Disk Utility stopped reparing "Time Machine." Disk Utility can't repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.
Does this mean the drive itself is failing? I erased the Time Machine partition and recreated it through Disk Utility, and then I verified it. Everything checked out okay, but I want to make sure, especially since I'm hosting my iTunes music in the other partition (it's backed up to a 2nd external drive, so if the drive does die, at least I don't lose everything).
Before this problem happened, both partitions dropped off the Finder and the light on the drive went off. I unplugged the drive and plugged it back in again a couple times, but nothing happened. Finally, the light went back on after plugging it back in for the 3rd or 4th time, but I'm wondering if the drive could be going bad, which would surprise me since it isn't very old.

Brad Cook wrote:
Disk Utility stopped reparing "Time Machine." Disk Utility can't repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.
Does this mean the drive itself is failing?
Possibly, but not necessarily. The File System on the disk was so badly corrupted that Disk Utility couldn't fix it. That might indicate a problem with the drive. It's not unusual for consumer-quality (ie, inexpensive) drives to fail after 2-3 years, although many will run for several years. It's a bit of a crapshoot.
Before this problem happened, both partitions dropped off the Finder and the light on the drive went off.
Whatever caused that is another good possibility -- if a drive is improperly disconnected, OSX can't "close it out" properly, and that can cause damage to the file system. Sometimes Disk Utility can fix it, sometimes it can't. And sometimes heavy-duty 3rd-party disk repair apps like DiskWarrior can fix things Disk Utility can't.
A power dip or spike could have caused it, or an overheated electronic component, etc. If it has it's own power supply, be sure it's on a good (ie, not cheap) surge protector or U.P.S. system.
Otherwise, keep an eye on it. If you don't have "secondary" backups, this would be an excellent time to get another drive for that purpose. See #27 in Time Machine - Frequently Asked Questions for some suggestions.
Bottom line: personally, I'd not trust my only backups to that drive.
(But then, I'd never trust my backups to any single drive, no matter how new or high-quality.)

Macbook pro won't boot and when I tried to back up the hard drive I got "disk utility can't repair this disk backup as many of your files as possible"

My macbook pro froze and initially would not even recognize the power chord. Now it charges, but will not load up. I opened in in disk utility to try and back it up so that I could take it to apple to have it fixed but I got the message that said "disk utility can't repair this disk backup as many of your files as possible". How do I back up the files???

Nichelle215,
you can try the method described on this Apple page, in the “Instructions for backing up to an external hard disk via Disk Utility” section. (You can skip step 6, since you already know that your disk is irreparable.) Note, however, that this method is not guaranteed to work. Once you get your disk straightened out, you might consider purchasing an external hard disk for use as a Time Machine backup destination, so that a similar problem in the future won’t wipe out the only copy of your files.

Hard drive clicking and disk utility can't repair

I have an iBook G3 that recently started making a clicking noise from the left side of the computer. At the same time it froze up and now it won't start up. I tried to start it in safe mode and it didn't work. I was able to start the OS X install disc and start the disc utility, but I get an error: Invalid Sibling Link, Volume Check Failed.
Does anyone know if there is anything else I can do to try to repair the hard drive myself? If not, how do I find someone reputable to get the data off of the drive (no I didn't back it up... ever) and install a new drive?
Thanks for any suggestions!

Hi, and welcome to Apple Discussions.
You could buy DiskWarrior and see if it can repair your hard drive. It can often repair a hard drive when Apple's own Disk Utility cannot. No guarantees that it can do it for yours, but DiskWarrior has saved my hard drive several times.
If you are able to get it up and running, be sure to back things up right away.

Can I use Disk Utility to erase Apple TV hard drive?

Can I use Disk Utility to erase Apple TV hard drive?

I don't know, but I doubt it can be done using Disk Utility. I suggest you consult the user manual for it or see if there is a Reset option in the onscreen menues. If you don't have a manual, then you will find one at http://support.apple.com/manuals.

Can not get external hard drives to connect to my computer 17" Mac book Pro 10.7.5

can not get external hard drives to connect to my computer I am using a 17" Mac book Pro 10.7.5.
I have 2 iomegas and 1 LaCie. Changed cables. I can feel the external hard drives running and
I can hear them running but I can not get them on the computer any more. They did work at one time.
Can any one PLEASE help?

Nothing appear on my desktop.
I did Repair and Verify the HDDs in Disk Utility>First Aid from the
Utilites App about a dozen times ans they all said everything was good
except for the last time there were erors found and I ran the
Disk Utility from the Start Up Disk and the repairs were made and everything
was subposed to te good and still Nothing on the desk top.
Ginger

After getting the dreaded gray/blue screen, I tried to run disk repair on the internal disk. I got an error message saying "Disk Utility can't repair this disk and restore your backed-up files. The volume Macintosh HD could not be verified completely

After getting the dreaded gray/blue screen, I tried to run disk repair on the internal disk. I got an error message saying "Disk Utility can't repair this disk and restore your backed-up files. The volume Macintosh HD could not be verified completely." What do I do now? This is an iMac and I'm running 10.6.8.

Clean Install of Snow Leopard
Be sure to make a backup first because the following procedure will erase
the drive and everything on it. See below for how to clone a drive.
     1. Boot the computer using the Snow Leopard Installer Disc or the Disc 1 that came
         with your computer. Insert the disc into the optical drive and restart the computer.
         After the chime press and hold down the "C" key. Release the key when you see
         a small spinning gear appear below the dark gray Apple logo.
     2. 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 the hard drive entry from the left side list (mfgr.'s ID and drive
         size.) Click on the Partition tab in the DU main window. Set the number of
         partitions to one (1) from the Partitions drop down menu, click on Options button
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         (Journaled, if supported), then click on the Apply button.
     3. When the formatting has completed quit DU and return to the installer. Proceed
         with the OS X installation and follow the directions included with the installer.
     4. When the installation has completed your computer will Restart into the Setup
         Assistant. Be sure you configure your initial admin account with the exact same
         username and password that you used on your old drive. After you finish Setup
         Assistant will complete the installation after which you will be running a fresh
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Download and install Mac OS X 10.6.8 Update Combo v1.1.
You may be able to backup your data if you have an erased external drive you can use. Before you do the above but after you have opened Disk Utility you can try to clone your drive:
Clone using Restore Option of Disk Utility
1. Open Disk Utility.
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 external backup drive. Source means the internal startup drive.
Now this will only work if the drive is accessible and can be cloned by Disk Utility. Otherwise, you would need to access your drive from another Mac that you can connect via Firewire - Target Disk Mode.

Disk Utility can't repair TM backup disk

Hello all
Recently, my external backup disk (a 750 GB WD My Passport) that I use with Time Machine has been acting up. At first, it wouldn't show up on the desktop, but was being recognized in Disk Utility (with the "Time Machine Backup" partition greyed out). After multiple restarts and unplugging/replugging the hard drive, I finally got to be properly recognized, i.e. it showed up on the desktop with the proper Time Machine hard drive icon. So I thought the problem was gone and started a routine backup. However, Time Machine returned an error:
"Unable to complete backup. An error occurred while creating the backup folder."
I search the forums, and followed the advice here: http://web.me.com/pondini/Time_Machine/C10.html
I tried repairing the disk, but DU couldn't repair it:
Verify and Repair volume “Time Machine Backups”
Checking Journaled HFS Plus volume.
Detected a case-sensitive volume.
Checking extents overflow file.
Checking catalog file.
Incorrect number of thread records
Checking multi-linked files.
Checking catalog hierarchy.
Checking extended attributes file.
Checking multi-linked directories.
Checking volume bitmap.
Checking volume information.
Invalid volume file count
(It should be 3991498 instead of 3904049)
Invalid volume directory count
(It should be 678218 instead of 673790)
Invalid volume free block count
(It should be 9588404 instead of 11784378)
Volume header needs minor repair
The volume Time Machine Backups was found corrupt and needs to be repaired.
Volume repair complete.Updating boot support partitions for the volume as required.
Error: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.
So now I'm still following the advice on the above mentioned page by posting on here. Any help at all would be greatly appreciated. I am using a 2010 15in 2.66 i7 MBP, if that makes a difference, although my guess is the problem's with the harddrive itself. I think there may have been one time about a month ago when Time Machine stopped responding (or something like that) which forced me to pull out the harddrive, possibly corrupting the data. But I'm not sure, and I do recall making at least one successful backup after that. Well, actually TM confirms this: "Latest successful backup: 5/27/11 at 11:51 PM". So I have no idea what's going on. Again, any help would be appreciated.

You can't tell what's corrupted or where. Time Machine backups have a very complex structure, all linked together. So, you can often do new backups, or restore individual items, or even entire backups, as long as you don't stumble over the damage.
There's a chance a heavy-duty 3rd-party disk repair app, such as Disk Warrior, can repair them. It's about $100, and probably a good investment for the future, but there's no guarantee it can fix them.
If not, or if you don't want to spend the money, your only option is to erase the disk and let Time Machine start fresh.
It sounds like you may have other data on it; if that's in the same partition, that's not a good idea. This is a good time to copy the data off, erase the disk, and make 2 (or more) partitions on it, so Time Machine has its own, exclusive space. See #3 in Time Machine - Frequently Asked Questions for details and instructions.

Partition errors - "Disk Utility can't repair this disk"

I partitioned my external 1TB WD HD into two drives (950GB + 50GB) using Disk Utility (OS X Mavericks 10.9.1). However the 950GB partition will no longer mount. It is recognised in Disk Utility, but grayed out. "Verify Disk" and "Repair Disk" in Disk Utility lead to the worrying error message "Disk Utility can't repair this disk."
From the Disk Utility logs, the initial partition was successful:
Partition 1:
Name: “Media Centre”
Size: 948.13 GB
File system: Mac OS Extended (Journaled)
Do not erase contents
Partition 2:
Name: “Media Centre 2”
Size: 50.03 GB
File system: Mac OS Extended (Journaled)
Do not erase contents
Mounting disk
Partition complete
Afterwards, I changed the name of the second partition “Media Centre 2” to "BOOTCAMP" (I was going to try to install Windows 7), but then changed my mind and tried to remove the second partition. At that point the log gives the error "Mount of “Media Centre” failed".
Partition 1 ("Media Centre") now seems to be in limbo, stuck as 950GB, and "Verify Disk" and "Repair Disk" in Disk Utility lead to the worrying error message "Disk Utility can't repair this disk". Also in Disk Utility, Partition 1 ("Media Centre") now has the format classification "Mac OS Extended" rather than "Mac OS Extended (Journaled)".
Any idea how I can get my hard drive to mount and get the data back?

In Disk Utility select the Top most entry on the left, the drive model and or manufacturer name and size entry, then click the Partition tab and Repartition it to your liking. If that fails the drive is bad.

Disk utility can't repair external hard drive

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