7 Replies Latest reply: Dec 7, 2013 3:05 PM by ben.mcintyre
Bruce Reading Level 1 Level 1

I backup with Time Machine to an external hard drive.  It is currently configured into two partitions, one being used to backup and the second used for other purposes.  I have maxed out the backup partition and wish to expand its size by eliminating the second partition.  Disk Utility allows the elimination of the second partition, but when I attempt to enlarge the backup partition to include the now unused space on the disk I get the following message:


Partition Failed


Partition failed with the error:


Filesystem resize support required, such as HFS+

with journaling enabled.


What does this message mean and how can I accomplish my goal?



  • Klaus1 Level 8 Level 8

    HFS+ with journaling enabled is how the drive should have been formatted before use. You may need to reformat it, which will wipe everything from the drive.


    Partitioning a hard drive:




    To resize (or delete) an existing partition without losing data, you will need to use, for example, iPartition:



  • Bruce Reading Level 1 Level 1



    From "Get Info" the formatting of the drive is described as "Mac OS Extended (journaled)".  Is that different from HFS+ with journaling?

  • BDAqua Level 10 Level 10

    Hi Bruce,


    No, that's the same thing, I read many reports on this trying to figure out the problem, there were many with your same error & they also had the correct HFS+ journaled/"Mac OS Extended (journaled)".


    Only fix I found was a dangerous sounding Terminal method, & I wasn't even sure which version of OSX it was for.

  • Bruce Reading Level 1 Level 1

    Thanks for the info. 


    Is it possible to transfer the Time Machine data on the partition to another disk, reformat and repartition the original disk and then transfer the data back to it?

  • BDAqua Level 10 Level 10

    Yes, that's a good idea..


    Get carbon copy cloner to make an exact copy of your old HD to the New one...




    Or SuperDuper...




    Then connect the clone & see if TM says it's alright or not, TM has some strange ideas about Disk UUIDs.


    Do you need the TM Backup that's on it now for some reason?

  • Arbor Friend Level 1 Level 1

    I know this issue is 14 months old, but perhaps someone else will read it in the future. I ran into this problem of needing to resize an external drive and discovered that Mac's Disk Utility program, built into the Mac OS, allows you to do this without losing data or needing to buy additional software.


    Here's how:

    1. Open Disk Utility and select the root diretory of the external disk you want to resize. (If the disk is partitioned, it will have a subdirectory for each partition.)

    2. At the top of the dialog box, select Partition.

    > You should see five buttons across the top of the dialog box: First Aid, Erase, Partition, RAID, and Restor

    > If you select a subdirectory, rather than the root directory, the Partition option is not displayed, because you can't partition a subdirectory.

    3. On the screen you should see the disk split into the different partitions. Select the partition you wish to resize.

    4. That partition will be highlighed and the lower right part of the box should have a little triangle-like series of lines. Click and hold this triangle, then drag it down to make the partition larger, or drag it up to make the partition smaller.

    5. When you get to the size you want, hit apply.

    6. Disk Utility should do its thing and your disk will be resized.

    Viola. You are finished.

    Take a look at http://macs.about.com/od/applications/ss/diskutilitysize_3.htm for pictures of this process.

  • ben.mcintyre Level 1 Level 1

    .. unless Disk Utility gives you the stupid message about needing a resizable filesystem like HFS+ journalled (when you are already USING HFS+ journalled).


    Solution to that scenario is here: http://flarn2006.blogspot.com.au/2010/09/grow-hfs-partition-on-mac-os-x-without. html