Partitioning w/out Losing Data on External HDD

Hello All,
I have a WD My Studio External HDD of 500GB. It contains invaluable data, however I need to temporarily create a bootable partition. The main goal is NOT to lose any data. Is this feasible through Disk Utility? Many thanks!

If the data is truly invaluable as you say, the chances for data while small are probably too large to take a chance. Since drive are relatively cheap, get another one for this project and don't take a chance.
|___________________
Allan

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