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Problem restoring my original disk partition

559 Views 6 Replies Latest reply: Feb 9, 2013 3:00 PM by jcbarquet RSS
jcbarquet Calculating status...
Currently Being Moderated
Feb 9, 2013 1:50 PM

Hi,

 

A couple months ago I made one partition to my 500 GB HD Macbook Pro disk of around 120 GB specifically for Time Machine. Having two partitions (the one for TM and the original one) made my notebook slower, so I eliminated the TM partition today. The problem is, that the "HD Macbook Pro" partition is still 380 GB, so I wanted to restore it to its original size via the Disk Utility. So basically I went to the 'Partition' tab, changed its size to 500 again and clicked 'Apply', but I got the following error:

 

Partition failed

 

Partition failed with the error:

Couldn’t modify partition map because file system verification failed

 

How do I fix this? I tried reboting the computer and it still doesn't work.

MacBook Pro
  • Kappy Level 10 Level 10 (220,950 points)
    Currently Being Moderated
    Feb 9, 2013 1:54 PM (in response to jcbarquet)

    What exactly did you do? To get back the space from the deleted partition you first remove the partition, then you drag the sizing gadget of the remaining partition down to the bottom of the partition map. Then click on the Apply button. What you described you did would cause DU to try and reparition the drive completely.

  • Kappy Level 10 Level 10 (220,950 points)
    Currently Being Moderated
    Feb 9, 2013 2:02 PM (in response to jcbarquet)

    That means there is a problem with the drive's partition map. This may be due to corruption or it may be the result of how you created and/or removed that small partition. The only recovery is to completely re-partition the drive. This will destroy all the information on the drive meaning you will need some sort of backup before doing anything to recover the drive.

     

    Did your computer come with Lion pre-installed or did you start with Snow Leopard?

  • Kappy Level 10 Level 10 (220,950 points)
    Currently Being Moderated
    Feb 9, 2013 2:40 PM (in response to jcbarquet)

    Yeah, I sympathize. So, here's what you need to do:

     

    Step One: 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 Installer menu (Utilities menu for Tiger, Leopard or Snow Leopard.) 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.

     

    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.

     

    Step Two: External Hard Drive Preparation

     

      1. Select your external 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.

      2. Under the Volume Scheme heading set the number of partitions from

          the drop down menu to one. Set the format type to Mac OS Extended

          (Journaled.) Click on the Options button, set the partition scheme to

          GUID  then click on the OK button. Click on the Partition button and

          wait until the process has completed.

     

    Step Three: Clone the old drive to the new drive

     

      1. Select the destination volume from the left side list.

      2. Click on the Restore tab in the DU main window.

      3. Check the box labeled Erase destination.

      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.

     

    Source means the internal drive. Destination means the external drive.

     

    Step Four: Repartition and reformat the internal drive and install Snow Leopard

     

      1. Select your internal 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.

     

      2. Under the Volume Scheme heading set the number of partitions from

          the drop down menu to one. Set the format type to Mac OS Extended

          (Journaled.) Click on the Options button, set the partition scheme to

          GUID then click on the OK button. Click on the Partition button and

          wait until the process has completed.

     

    3. When formatting is complete quit DU and return to the installer. Now install

         Snow Leopard.

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