How do I encrypt an existing external disk?

I have two G-Raid Thunderbolt RAID disks. Each is set up as a RAID 1 stripe (2 disks into one volume).
I have my system disk encrypted with filevault, and would like to enable full disk encryption for the external disks as well.
I tried the "Right click on disk in finder, select encrypt" option, but after I enter my choice of PW, I just get the error:
"A partition, not a whole disk, is required for this operation."
Is this possible? Preferably, without formatting my disks all over again and enabling the encrypted FS at that time?

Grr, I think I just found my answer:
"FileVault disk encryption cannot be used with some highly partitioned disk configurations, such as RAID disk sets."
That's too bad.

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VKP90 wrote:
When I tried to encrypt a single file within the hard drive itself, I got the following: Disk Utility Progress: Unable to create "Name of my file" (Permission Denied).
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