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Free space at top of partition table

317 Views 9 Replies Latest reply: Jan 20, 2013 9:16 PM by den.thed RSS
Oli0157 Calculating status...
Currently Being Moderated
Jan 20, 2013 3:54 AM

Hi, I'm running OS X Mountain Lion on a Late 2009 iMac. Over the last few days, I have noticed that something has gone horribily wrong with my internal hard disk. The free space on my drive, instead of being at the bottom of the table, is at the top.

Screen Shot 2013-01-20 at 10.37.56 PM.png

I've got no idea how I managed to do this, but I was wondering if anyone knew how to fix it. Running

$ sudo gpt -r -vv show disk0



gpt show: disk0: mediasize=1000204886016; sectorsize=512; blocks=1953525168

gpt show: disk0: PMBR at sector 0

gpt show: disk0: Pri GPT at sector 1

gpt show: disk0: Sec GPT at sector 1953525167

       start        size  index  contents

           0           1         PMBR

           1           1         Pri GPT header

           2          32         Pri GPT table

          34           6        

          40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

      409640  1241064104        

  1241473744   710781848      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC

  1952255592     1269536      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

  1953525128           7        

  1953525135          32         Sec GPT table

  1953525167           1         Sec GPT header


$ sudo diskutil list




   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *1.0 TB     disk0

   1:                        EFI                         209.7 MB   disk0s1

   2:                  Apple_HFS Lion Client             363.9 GB   disk0s3

   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s4

Any help would be appreciated. Thanks

Late 2009 27, Mac OS X (10.7), Core i5
  • BDAqua Level 10 Level 10 (114,670 points)
    Currently Being Moderated
    Jan 20, 2013 12:14 PM (in response to Oli0157)



    First question that comes to my mind is the 512 Byte Sectors, anyway you can find out if that drive might really have Advanced Format 4096 Byte Sectors?


    (Reaching for an explanation! )

  • BDAqua Level 10 Level 10 (114,670 points)
    Currently Being Moderated
    Jan 20, 2013 3:41 PM (in response to Oli0157)

    If you highlight that top empty partition, can you resize it to say zero?

  • BDAqua Level 10 Level 10 (114,670 points)
    Currently Being Moderated
    Jan 20, 2013 6:27 PM (in response to Oli0157)

    Did you original Format it for that Free Space?


    Did you maybe Sector clone from a smaller drive to this one?


    Can you highlight your Lion Client & expabd it to the Frre Space?

  • den.thed Level 7 Level 7 (23,325 points)
    Currently Being Moderated
    Jan 20, 2013 7:54 PM (in response to Oli0157)

    You need to clone everything to an External HD using CarbonCopyCloner or Disk Utility, then erase and return the Internal Hard Drive to 1 Partition. Then clone back from the External Hard Drive using CarbonCopyCloner or optionally reinstall OS X and migrate back from the External Hard Drive using the setup assistant.

  • den.thed Level 7 Level 7 (23,325 points)
    Currently Being Moderated
    Jan 20, 2013 9:16 PM (in response to Oli0157)

    iPartition at $47 might be the ticket, although I've never used it or would without the aforementioned Backup just to be safe.


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