Disk Utility - Partition map needs repair because a data partition needs loader space.

I just finished setting up both my OSX and Windows installs from scratch after fitting an SSD, which in-turn was right before my logic board died and Apple replaced it, now it looks like I have some sort of hard drive issue brewing.
This was my plan for the SSD, and how it currently displays in Disk Utility although that wasn't the case earlier:
And in Terminal:
My intention was to have two boot partitions for each OS, 'Macintosh HD' and 'Win 7 Pro' and a third shared data partition 'Projects' on the SSD, which I made in Drive Genius after installing Boot Camp. I don't want Macintosh HD accessible from Windows because I'll be using Paragon HFS+ or MacDrive to give write access and don't want OSs stomping on other OSs turf, hence needing three partitions. Everything looked fine until I just checked Disk Management under windows and realised it couldn't see the Projects volume. Even though it's fine in OS X, it was just marked black/unallocated space.
So I booted back into OSX, all my files look fine so I ran Disk Utility and the Partition tab looked really odd - unfortunately I didn't get a screenshot. All volumes reported their size correctly but visually, Macintosh HD took up most of the drive. I could see 'Windows 7 Pro' under this, but the Partition Layout section had a scrollbar, which if I scrolled down showed 'Projects' squished into a tiny gap at the bottom. I ran a Verify, which reported no problems, and at some time since the Partition Layout has reverted to how it should look (as in the screenshot above), with 'Projects' book-ended by "Macintosh HD' and 'Windows 7 Pro'.
Now when I run a Verify on Macintosh HD or Projects volumes, it says there's no problem, but if I run one on the drive, I get this message:
Volume Macintosh HD on disk0s2 has 0 bytes of trailing loader space and it needs 134217728 bytes
Problems were found with the partition map which might prevent booting
Error: Partition map needs repair because a data partition needs loader space.
I've only managed to find one other mention of this error here, but the fix is not relevant to me because I don't have Sophos installed. I've tried Single User/Safe Mode but it just boots into normal mode, so I can't do a fsck -fy.
** /dev/rdisk0s2 (NO WRITE)
Can't open /dev/rdisk0s2: Permission denied
That value in bytes is exactly 128mb, so I suspect the problem lies with one of the invisible partitions that show up in iPartition and Disk Management under Windows, but not in Disk Utility. I have backups and I suspect the root of the problem is partitioning in iPartition after installing Boot Camp, but I've never had issues with this approach in the past so I'm wary of just giving up and reinstalling Windows again will be massive hassle because I no longer have a SuperDrive and last time it refused to install from USB.
Anyone have any idea what's going on? It seems like the sort of issue Disk Utility should just handle, at least in Recovery mode, but it's not playing ball. It also doesn't seem like a massive problem since my files all look fine and performance is OK, so I'm reluctant to do anything major.
I'll update with a shot of the drive in Disk Management from Windows in a few minutes, in case that sheds light on anything. Thanks!

Similar issue here. I manually partitioned my hard disk for triple boot (using Gparted on Linux), then everything was just fine until I ran bootcamp, to do something as simple as create a boot USB.
I get the same error as a result and have to work my way into booting, by resorting first to a Linux live USB, then restarting from the live USB, to finally reach my rEFInd boot manager, or whichever boot manager should be initialized at startup.
I suppose that the cause in my case is that some operation "scratched" the protective MBR. See this:
http://www.mactech.com/articles/mactech/Vol.23/23.03/APMtoGPT/index.html
I am hoping to fix it using an external Yosemite installation media: see this guide -
http://www.macworld.com/article/2367748/how-to-make-a-bootable-os-x-10-10-yosemi te-install-drive.html
And as a last resort to reinstall.
I'll admit I am negatively surprised. I need this computer for professional reasons, and for the sake of "preserving the integrity of OSX", measures defined by Apple instead tend to make partitions far easier to damage. And this problem seems to affect a number of users.
As for what I have to go through to fix it: a 5GB download, during which I have to register my credit card to the Apple Store. "Pay first, get your free software next."
IF Disk Utility can fix it, from the external media, then fair enough. The hassle is unpleasant but it files as "a choice".
Otherwise you can file it safely under software design calamity.

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Yesterday I ran Disk Utility and came up with hundreds of permissions that needed repair. I hit the "repair permissions" button and waited until it said they were repaired, but just for fun I hit the v

Yesterday I ran Disk Utility and came up with hundreds of permissions that needed repair. I hit the "repair permissions" button and waited until it said they were repaired, but just for fun I hit the "verify permissions" button again, and they all came back! I did this several more times and every time I would hit "verify permissions" I would get the same list. What's up? I've always suspected diagnostic programs, but this is Apple's own!

Ignore them. They aren't errors. You will keep seeing the same ones. As long as you get the message "Permissions repair complete," you're OK.
http://support.apple.com/kb/TS1448?viewlocale=en_US

Seagate external drive: Partition map check failed because no slices were found

I have a 3TB Seagate Expansion external backup drive connected to my Retina Macbook Pro via USB. The disk will not eject from a regular Finder window - it will only eject from Disk Utility. Backups seem to otherwise be running fine. I tried to verify/repair the disk in Disk Utility, and I got the following error: "Partition map check failed because no slices were found." I am able to verify/repair the partition without any problem, and no errors are found.
I'm concerned about relying on a backup drive that may be heading south. Here is the output from diskutil info:
diskutil info disk3
   Device Identifier:        disk3
   Device Node:              /dev/disk3
   Part of Whole:            disk3
   Device / Media Name:      Seagate Expansion Desk Media
   Volume Name:              Not applicable (no file system)
   Mounted:                  Not applicable (no file system)
   File System:              None
   Content (IOContent):      GUID_partition_scheme
   OS Can Be Installed:      No
   Media Type:               Generic
   Protocol:                 USB
   SMART Status:             Not Supported
   Total Size:               3.0 TB (3000592977920 Bytes) (exactly 5860533160 512-Byte-Units)
   Volume Free Space:        Not applicable (no file system)
   Device Block Size:        4096 Bytes
   Read-Only Media:          No
   Read-Only Volume:         Not applicable (no file system)
   Ejectable:                Yes
   Whole:                    Yes
   Internal:                 No
   OS 9 Drivers:             No
   Low Level Format:         Not supported

@ Allan Eckert: Unfortunately, reformatting is out of the question, I have 5 years of work on this!
@ Loner T: Yes, the firmware did successfully upgrade after router reboot and a bit of troubleshoot.
Thanks for the quick replies. Keep 'em coming!

IMac won't launch, disk utility says I cannot repair my Macintosh HD, back up files, reformat the disk and restore backed up files. How do I do all that? Help!

iMac won't start up, disk utility tried to repair disk it shows "keys out of order" error message in red and advises me to back up files, reformat disk and restore backed up files. I have no idea how to back up and restore etc... Help! Please!

Get an external drive of sufficient capacity to hold everything on your internal drive.
Partition and format the external drive.
Drive Partition and Format
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. 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 Apply button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
Clone your internal drive to the external drive.
Clone Mavericks, Lion/Mountain Lion using Restore Option of Disk Utility
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
     1. Select Disk Utility from the main menu then press the Continue
         button.
     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.
Boot from the external drive.
Boot Using OPTION key:
1. Restart the computer.
2. Immediately after the chime press and hold down the
      "OPTION" key.
3. Release the key when the boot manager appears.
4. Select the external disk icon from which you want to boot.
5. Click on the arrow button below the icon.
Reformat the internal drive and install OS X.
Install or Reinstall Mavericks, Lion/Mountain Lion from Scratch
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Erase the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your startup volume (usually Macintosh HD) from the
      left side list. Click on the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on
      the Security button and set the Zero Data option to one-pass. Click on
      the Erase button and wait until the process has completed.
4. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion, Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible
            because it is three times faster than wireless.
Open Startup Disk preferences and set the internal drive as the startup volume, then click on the Restart button.
Restore your data from your external drive backup.

Partition map check failed because no slices were found for WD My Book 1140 media

Have been using a WD My Book 3TB HD which was partitioned into three 1TB partitions for almost a year. Now when I try to access it via my MacBook Pro I am getting the following error message "Problems were found with the partition map which might prevent booting; Error: Partition map check failed because no slices were found". Does anybody have any suggestions on how to repair this problem and salvage information stored on it?

I am also experiencing this problem.
4TB Hitachi Deskstar. Internal. Disk not readable error on boot.
"Partition map check failed becuase no slices were found" error when I attempt to verify or repair with Disk Utility.

Disk Util"Filesystem verify or repair failed"& failed hardware test w/CD

Calling all mac gurus...
My trusty MacBook Pro is starting to play up. i.e. crashing unexpectedly & at random, no particular program can cause the screen to dim and a box come up in different languages saying you must restart with a pic of the power button.
the probs started around/after I deleted XP from the laptop, and ran the system upgrade(from 10.5.6 to 10.5.7)
Disk Utility: I run the verify disk on the system volume. results with error:
2009-08-08 17:46:04 +0100: Verifying volume “Macintosh HD”
Starting verification tool: 2009-08-08 17:46:04 +0100
2009-08-08 17:46:04 +0100:
2009-08-08 17:46:05 +0100: Performing live verification.
2009-08-08 17:46:05 +0100: Checking Journaled HFS Plus volume.
2009-08-08 17:46:05 +0100: Checking Extents Overflow file.
2009-08-08 17:46:05 +0100: Checking Catalog file.
2009-08-08 17:46:30 +0100: Invalid extent entry
2009-08-08 17:46:42 +0100: 2009-08-08 17:46:42 +0100: Incorrect block count for file CACHE_003
2009-08-08 17:46:42 +0100: 2009-08-08 17:46:42 +0100: 2009-08-08 17:46:42 +0100: (It should be 279 instead of 282)
2009-08-08 17:46:42 +0100: Checking multi-linked files.
2009-08-08 17:46:58 +0100: Checking Catalog hierarchy.
2009-08-08 17:48:28 +0100: Checking Extended Attributes file.
2009-08-08 17:48:28 +0100: Checking volume bitmap.
2009-08-08 17:48:28 +0100: Checking volume information.
2009-08-08 17:48:28 +0100: 2009-08-08 17:48:28 +0100: The volume Macintosh HD needs to be repaired.
2009-08-08 17:48:28 +0100: Error: Filesystem verify or repair failed.2009-08-08 17:48:28 +0100:
2009-08-08 17:48:28 +0100: Disk Utility stopped verifying “Macintosh HD” because the following error was encountered:
Filesystem verify or repair failed.
2009-08-08 17:48:28 +0100:
I have also run a hardware test after the disk verify didn't work from the install cd.
results on hardware test:
Last Run: 3/08/09 4:24 PM
Version: 3A134
Test Suite: Extended Test
Loop Count: 2
Result: Failed
Failure code: 4MEM/12/40000000: 199640c8
Any help would be much appreciated. as I use this Laptop for work, and cant really send it away anywhere to be fixed.
Message was edited by: Mß

Mß wrote:
so, I have done re-install from the OSX disk - the first time it failed. I think because I selected the option to keep the user profiles/settings etc, may have been a conflict between vers on OSX CD and vers on HDD? I don't know.
No, it can do that. There are clearly other issues.
anyway an error came back saying the disk was corrupt
The install disc or the HD?
now I thought that sorted it. but after doing the updates. and then going to repair the disk permissions/repair the disk it came back with same error. and also the hardware test is still failing.
The system will never be stable until the HD directory is repaired.
- is the version of the hardware tester I have not compatible with the OS or the firmware i have upgraded to? or does the tester just check the integrity of the hardware regardless of firmware & os vers.
If this is the AHT disc that shipped with your MBP, it is fine, regardless of what OS you have installed.
I really would prefer to not start from scratch again. But could this be an user account problem?
No.
I'll set up a new usr acct and use that for a while. just a pain to bring the files over from my current usr acct to the new one.
I believe that's a waste of your time. As has already been stated, at least one of the issues is the damaged HD directory. Until/unless that is repaired, what you install on the HD isn't going to work correctly, if at all. The big question is, is some other part of the hardware causing the directory damage, or did the directory take a freak "hit" and repairing it will resolve things? It's quite possible that bad RAM or the logic board could have caused the directory damage. You're either going to have to bring it in to an Apple Store "genius" bar and see how much they'll test for free, or do some things yourself. For things you can do yourself, apart from trying one RAM module at a time, and running Repair Disk repeatedly (I don't think that's going to do it), you're going to need to either get your hands on Disk Warrior (or comparable utility), or a different HD, or try the HD in an external enclosure, or get your hands on some different RAM to try.

External drive error, does not mount: "Partition map check failed because no slices were found"

Hardware: MacBook late 2009 (2.26Ghz Core 2 Duo 2 GB RAM 250GB HDD) running 10.9.4, Hackintosh MacPro (3.29Ghz i3 16GB RAM 1TB HDD) running 10.9.4, external 3 TB Seagate Backup+ drive
As you can can see from the screenshot below,
The external drive was initially plugged in a Netgear WNDR4500 router by USB to be used as NAS. I was in the middle of updating the firmware when there was a power outage. Upon reboot, the drive no longer mounts, whatever it is plugged in (router, Mac, PC, etc.).
I ran DiskUtility on the partition map and volume, same errors. Here's an what I see:
As you can see above, the "Mount" icon is greyed out and I get the error message "Partition map check failed because no slices were found". If I select "the Archive" partition, the "Mount" icon is not greyed out but clicking it doesn't do anything. My HDD is basically unreadable.
I issued a few Terminal commands to see what was the problem, here are the results:
What can I do?
Currently running analysis on TestDisk and it is 50% after 48hrs. Need some help!

@ Allan Eckert: Unfortunately, reformatting is out of the question, I have 5 years of work on this!
@ Loner T: Yes, the firmware did successfully upgrade after router reboot and a bit of troubleshoot.
Thanks for the quick replies. Keep 'em coming!

Disk Utility unable to Verify/Repair Permissions since this week's update

Hey there folks- I am experiencing some software problems with certain apps not launching (I understand it is an issue with QT now but am not clear on how to revert... Help?) and naturally panicked a bit.
I went into Disk Utility and tried to Repair Permissions.
Starts checking and then claims to lose connection and that I need to quit it and relaunch. This, of course, tells me that I am about to corrupt the disk and will "pay" for it (not seriously but feels like it!).
Anyone know what I can do to fix this as I really cannot, this minute, afford to reformat as I am working flat out with the machine.
So- review- unable to repair permissions and sometimes the machine runs slower than usual on the net as well as no longer launching some applications. Missing a few too but I can live with that!
Any help VERY gratefully received.

Oh dear lady upstairs! Sorry to not have responded sooner- I never got the message that you had answered me... Bit odd that!
OK- thanks for that. I do so like understanding what I am doing and, more importantly- WHY!
Will do and let you know if that sorts matters...
As for QT- I hear tell that it can interfere with the running of applications and I certainly had a lot more than just Disk Utility fail on me. Stuff APPEARS to launch and then just stops after a few bounces of the icon on the dock.
Of course that TOO began only after the update.
I have to say- if it weren't for your calming influence I'd have freaked by now. I mean- how can we trust the updates if they cause such agro?!
LOL!

OSX Lion Disk Utility won't verify/repair RAID volumes

SInce I upgraded to Lion (now at 10.7.4) I can't use the Disk utility to verify or repair the disk catalog (disk first Aid) on apple soft RAID volumes. These volumes were created in 10.6 use the Apple RAID feature of disk utility.
I have one striped and one concatenated volume - neither will work. Press the button and the progress bar flashes for a fraction of a second, then nothing. no error, no message in the window - just no repsonse. Works fine on non raid volumes in the same disk enclosure -Firmtek Seritek/5PM, with seritek 2ME4-E sata card.
Not sure I really want to recreate and recopy the drives....
Any ideas? Seaches haven't turned up this specific issue.

A quick search in these forums for permissions or *permissions problem* reveals many posts the past four months.
In a nutshell, repairing permissions w/Leopard takes anywhere from 10-40 minutes, depending on what's installed and what's contained in /Library/Receipts/bom/. The repair permissions operation has changed in Leopard. The stalled progress bar is an unresolved bug (they haven't figured out how to make it work whilst it's checking or rebuilding the a.receiptdb, in /Library/Receipts/db/. To see what's really going on, open that folder in a Finder window, select list view, launch Disk Utility, select your boot volume, and click on repair permissions. Watch the Finder window flash files that are being read and checked against the current a.receiptdb file. That's what's taking all the time and freezing the progress bar. Once that's finished, the progress bar starts moving and the permissions are being checked and repaired. Also note, that you won't get any *they were repaired* message back for any that are noted to be incorrect.

Disk utility won't let me resize Time Machine partition

My Time Machine is a 400GB partition of a 1 TB external HD. There is another 600GB partition that is empty. In Disk Utility I was expecting a dot/divider between the two partitions so that I could resize them. It is not there and and when I select the TimeMachine partition is says 'This Partition will not be modified'.
Can I re-size ( increase) the TimeMachine partition? or do I have to delete and recreate?
My Timemachine backs up a 500MB HD in my iMac (40% full) and a 500 MB external HD for iTunes (22% full) (including AppleTV content).
I was thinking of making the TimeMachine partition 1TB? does that make sense?
..Bob

bobwild wrote:
My Time Machine is a 400GB partition of a 1 TB external HD. There is another 600GB partition that is empty. In Disk Utility I was expecting a dot/divider between the two partitions so that I could resize them. It is not there
what do you mean? what's not there? the divider? that can't be. please explain exactly what you are seeing in disk utility. first, you can only increase the TM partition using DU if it's the upper partition when viewed in DU. if it's the lower one then you can not increase it with disk utility. secondly, the other partition should be deleted, not just empty. you can delete it using the minus sign in the partition tab in DU. then grab the lower right end of the TM partition and drag it all the way down to cover the free space left by the former 600GB partition. then click "apply".
and and when I select the TimeMachine partition is says 'This Partition will not be modified'.
Can I re-size ( increase) the TimeMachine partition? or do I have to delete and recreate?

Disk utility's will not repair permission launch from option V 1.0(53)

Disk utility's will not repair permission launch from option V 1.0(53)

What is Option V in reference to? What happens when you attempt to repair permissions? Please describe your issue in more detail. Thanks.

Disk utility can't verify/repair partition map.

When trying to verify/repair my hdd it gives me the error: "Error: Couldn’t find the target disk for this operation."

You should already have a Recovery HD that was created when you installed Lion or came with the computer pre-installed. The Recovery Disk Assistant simply makes a Recovery HD you can use if one is missing from the hard drive.
However, repartitioning will destroy all the data on the drive so you will have to reinstall Lion. It will also remove the Recovery HD from the drive, so you will need to use your flash drive Recovery HD to boot the computer and get to the recovery main menu. The essential process:
Install or Reinstall Lion from Scratch
If possible backup your files to an external drive or second internal drive.
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
You will need to use the OPTION boot method to select your recovery flash drive as the boot volume.
Repartition the hard drive:
Select Disk Utility from the main menu and click on the Continue button.
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.
Select one partition from the Partition Scheme dropdown menu. Click on the Options button and 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.
Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion and click on the Continue button.
When the destination drive is displayed click on the Display Other Drives button and select your internal hard drive as the target.

Grey bar at startup - Mac HD is greyed out in Disk Utility - Can't be repaired? Need to salvage my data!

Mac Book Pro -
My MacBook Pro (2008 Model) has been unable to start up - upon the start up screen when the grey Apple logo appears, I get a loading bar below it.
After about 15-20 minutes when the bar is almost complete the machine shuts off. There seems to be no way around it.
So I booted up my laptop in recovery mode, and opened Disk Utility to check my if there was something wrong with my drives -
my Macintosh HD (under the TOSHIBA drive) is greyed out. When I hit verify/repair it returns error messages and it remains greyed out.
I tried multiple times and a few times it stopped being greyed out on the sidebar, but even then it wouldn't let me verify or repair.
Not backing up my data recently is my obvious fault here, but I just wanted to know if there is ANY way to salvage my data.
Things I've tried:
1) Recovery Mode
     -Veryify/Disk Repair doesn't work
     -Time Machine can't seem to access my HD either (greyed out)
2) TargetDisk mode
     -I connected my MacBook Pro via firewire to my Mac Pro in TargetDisk mode and no Hardrive shows up on my finder.
Any advice appreciated, going to try and take it to a tech shop on Monday.
Thank you!

I would take out the HDD and install it in an enclosure and then connect that to the Mac Pro and see if there is any success.
If not, then look for data recovery software on the Internet. Most will have a 'trial' version that will indicate if the software will be successful or not, so you do not have to commit funds without knowing if it will work or not.
The last option is a professional recovery service. There will be no guarantees of success and the costs will be very high.
Ciao.

Help help!! Disk Utility reported can't repair my HD

Hello all I used Disk Utility (version 10.5.5) that comes with Mac OS X 10.4.6 to check my hard drive. The diagnostic returned a message that my drive needed to be repair. So I booted up with installation disc and did the repair.
One of the log says there is an error in red font "Invalid leaf record count"
and the repair results were as the following:
1HFS Volume repaired
1 Volume Could not be repaired.
What does "Invalid leaf record count" mean?? And why 1 volume in my drive can't be repaired? How do I repair it?
I only have 1 volume on my HD, I didn't partition my drive. So, what is causing the problem? Should I be ignored? What's the benefit of partitioning my drive?

Sometimes the file directory is corrupted or damage beyond Mac OS X's Disk Utility can repair, but don't panic just yet. Get a copy of Disk Warrior, boot from it and run it, it will build a brand new file directory and replace the old one, that should solve your problems, a lot of us here "swears" by Disk Warrior, in fact I had your similar problem, ran DW and problem solved.
As for disk partition, it is not really necessary in modern OS like the Mac OS X, one of the reason people partition disks (a long time ago) because in the older days of the older Mac OS, it is unable to read a large hard drive beyond a certain size, i.e. if you place a 250Gb (of course then there is no 250 yet) inside your Mac, your Mac probably can only read it is 120Gb large, so that's why you need to partition the drive into 2 or 3 to read.
People also partition drives to run and boot multiple OS, this is especially true maybe for tech guys etc, who may have OS X, various versions, and OS 9 running in different partitions.
Cheers

External drive does not show up in finder/ disk utility not able to repair

Hello,
My external drive does not show up in finder. But it appaers in DISK UTILITY. When I tried to repair it, it said:
Verify and Repair volume “ANNE HD”
** /dev/disk1s1 (NO WRITE)
** Phase 1 - Preparing FAT
** Phase 2 - Checking Directories
Unable to read directory (Input/output error)
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.
How can I back up files if the external drive is not found in FINDER? I tried to restore with disk utility, but it doesn't seem to be able to select the hard drive.
Can you please help me?

Thanks a lot Niel,
Diskwarrior is a program for what you need to buy a DVD. I live in Brazil I have no idea where to buy it. Or can you download it?
A

Disk Utility - Partition map needs repair because a data partition needs loader space.

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