How to create a JBOD without formatting one of the hard drives

Hi,
I'm using a QWC Mercury Elite Pro external hard drive with 2 500Gb hard disks as my video scratch disk. I have configured them as 2 separate disks and been using CCC to copy the 1st drives content to 2nd drive. Now, the 1st drive is almost full. I'm planning to JBOD these 2 drives into a single drive but I don't want to format the drive with 500GB of video in it. Is it possible to do that?
Basically, I would like to add another 500GB hard disk to my current 500 Gb disk (which is full) and see them as a single drive without formatting the current drive.
Thanks.
Ucan

to JBOD these 2 drives into a single drive
You just said a nonsequitor.
to JBOD two drives
is to make them into two separate distinct drives with no RAID configuration applied to them.
Do you want them to act as a single cohesive drive unit, or one where files get copied automatically between the two of them in some RAID configuration? I know JBOD configurations quite well, but RAID I'm not too familiar with.

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