Bad Partition on external hard drive: format the bad Partition or format the entire disk?

I am confused how to proceed.

I have an external hard drive 3 TB with partitions (3). One of the parititons cannot be verified. I saved the partition and tried to repair disk. Repair disk failed and invited me to reformat the hard drive.

How can I reformat the partition without affecting other partitions (2) good bad?

Or do I have to save all the external drive (all 3 partitions) and then to reformat all the external drive?

Thank you

Retina 5 k

10.10.5 OS

32 GB of Ram

Back up the entire disc (as a precaution), select the partition in disk utility, click on the tab erase or Format and erase it.

(140323)

Tags: Mac

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