9478 Views 2 Replies Latest reply: Nov 24, 2007 1:54 PM by Wayne T
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:
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.