SDHC Disk Utility formatting error (Transcend 16gb)

Discussion in 'MacBook Pro' started by Username02, Sep 30, 2010.

  1. Username02 macrumors regular

    Joined:
    Jul 13, 2010
    #1
    Hi all and apologies if this is posted in the wrong forum.

    Perhaps you may help me troubleshoot an issue I am having trying to format a SDHC card on my MBP.

    I am trying to create a recovery SDHC disk for my MBP.
    The disk is a Transcend 16gb (class 10).

    I formatted to Mac OS Extended (Journaled) w/ a GUID Partition Table but after this, Disk Utility is now showing only 10.38 gb of usable space, but finder is showing me the full amount (15.79 gb). When I look in finder there are NO files or folders on the drive.

    I tested trying to put more than 10.38 gb worth of files on the disk and was told there was not enough space.

    If I format the disk to anything other than Journaled, I get the full 15.79 gb. Has anyone ever experienced this before?

    Any way to remove this ~ 5 gb of ghost data on my drive?

    My pictures may describe this better. Thanks for any insight:
     

    Attached Files:

  2. mulo macrumors 68020

    mulo

    Joined:
    Aug 22, 2010
    Location:
    Behind you
    #2
    try to format it again, but this time check the option to secure erase it.
    worth a shot i'd think.
     
  3. Username02 thread starter macrumors regular

    Joined:
    Jul 13, 2010
    #3
    Thanks for the suggestion and quick reply.

    Unfortunately, I have actually attempted this 2 times already with no luck. After the secure erase, it still looks exactly like the screen shot.

    Some other things I have attempted which have proved unsuccessful:

    - Format on windows to FAT then reformat in Mac as journaled.
    - format as non journaled then enable journaling
    - rebuild directory with Disk Warrior
    - create 2 partitions then delete the second (fat) then try to grow the 1st partition (Mac OS Extended (Journaled)
     
  4. Username02 thread starter macrumors regular

    Joined:
    Jul 13, 2010
    #4
    Is there any chance that anyone here owns one of the Transcend 16gb class 10 cards and can do a test format and let me know if it looks like the screen shot?

    Thanks
     

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