It is very difficult to create a disk partition of the exact same size as an existing partition of another disk using Apple’s Disk Utility. Whenever I try that, I always find the size of the partition created by Disk Utility is slightly different from the partition I’m trying to clone. Here’s a way using the command line that allows you to get the size precisely right.

The standard warning applies: Be very careful. This will wipe

the entire disk that you are repartitioning. One small typo could aftereffect in the wrong disk being wiped!
Here’s how to do it:

1. Open Terminal, and whether your history doesn’t have administrator privileges, su to the administrator user.
2. Type diskutil info /Volumes/partition_to_clone/ to find the size of the partition you want to clone. The output should include something like that …

   

   

   Original post by Michael Rose

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