Your experience may vary, but I found that when I did not add the extra 262144 blocks, the new partition - the one I wanted to use for the clone - was too small by exactly 262144 blocks. I verified this both with the diskutil info command, and also by looking at the disk size in the Finder.

I wonder if perhaps the partition size used to be exactly what was requested, but Apple have changed it for some reason so that the 262144 blocks of this reserved space is now carved out of the request.

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i was able to just copy+paste the log byte number in the disk utility, and it came out EXACTLY the same as the original disk size. Even if the number is long, just paste it in the box, it'll format appropriately! ;)

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