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Partition Failed -- Could not unmount disk

9176 Views 2 Replies Latest reply: Nov 24, 2007 1:54 PM by Wayne T RSS
Sean M Level 1 Level 1 (115 points)
Currently Being Moderated
Oct 29, 2007 7:20 PM
I partitioned my external hard drive into two parts. Now I want to change it back to one partition (500 gb).

I backed up all the data.

When I use disk utility and try to re-partition to create one partition from the two existing partitions, I get the error message:

Partition failed
Could not unmount disk.

What am I doing wrong??

THANKS.
MacBook Pro 17" 100gb 2.16 ghz 2GB sdram, Mac OS X (10.4.7)
  • Joe Gordon Level 4 Level 4 (1,985 points)
    Currently Being Moderated
    Oct 29, 2007 7:30 PM (in response to Sean M)
    Try Erasing it first and see if that will solve the issue, if not try running Disk Repair. Also, if it is to have a cloned OS be sure to choose Partition/Option/GUID Partition Table.

    Joe
    Mac Pro 2.66 Ghz, Mac OS X (10.4.10), Scratch (RAID 0), PM G4 (10.3.9, PM 6500 (10.2.8)
  • Wayne T Level 4 Level 4 (2,235 points)
    Currently Being Moderated
    Nov 24, 2007 1:54 PM (in response to Sean M)
    Sean M wrote:
    I partitioned my external hard drive into two parts. Now I want to change it back to one partition (500 gb).

    I backed up all the data.

    When I use disk utility and try to re-partition to create one partition from the two existing partitions, I get the error message:

    Partition failed
    Could not unmount disk.


    What are you booting from Sean ?

    You could always startup with the external Off, runn DU then turn external ON.. and try.
    orig g4 733, many others thru (the luvly) Macintels, New & old Macs, Wintels, MacIntels, other systems...

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