Can not unmount, or erase partioned external hard drive

I replaced a 1 TB external drive partiotioned in 2 with a 3 TB extrnal drive run/store my corbon copy cloner back up and time machine.
The 3 TB drive was successfully partitioned through the disk utility and both back ups are installed and the initial back up is complete.
My question is about the 1 TB drive. I want to completely erase all data from the drive in order to use it for a different use.
Using disk utility one of the partitions deleted without incident when following the same protocol the second partition produced error messages.
Volume erase failed
Volume Erase failed with the error:
Couldn’t unmount disk.
If I try to eject the disk
It says it will not eject becaus e a program may be using it...
The only program that utilized this partition is Carbon Copy Cloner which is not being utilized on the new 3TB drive.
I do not see where there is a option to have more than on disk chosen for this purpose so am unsure why the disk utility is seeing the old partion as still in use.
Any assistance to clear this external drive would be appreciated.

Be sure you've actually Quit CCC. Try ejecting the drive. Wait one minute then reconnect it. Open Disk Utility and try again. Be sure you use the Partition Scheme dropdown menu to set the new partition scheme, choose the Format Type, then click on the Apply button.
If it still doesn't want to unmount, then open Spotlight preferences, click on the Privacy tab, then drag the drive's Desktop icon into the list. Quit preferences and try Disk Utility again.

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Message was edited by: Fortuny

Can not unmount, or erase partioned external hard drive

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