I have downgraded RST to 12.9.0.1001 and I still cannot mirror my drive but the behaviour is is slightly different now.
- If I select the drive a I want to mirror the question "do you want to keep data from one of the selected disks?" appears but without the radio buttons required to answer the question.
- If I select the unallocated drive no option to keep data appears (as expected).
- If I select a third, formated, drive the option to keep data appears with the required radio buttons (as expected).
I have attached screenshots illustrating the three states.
By the way, I followed the link from this RST support page to this compatibility sheet to determine chipset compatibility for RST, but it is somewhat old and doesn't have a version-to-version compatibility matrix. Is there some way to look up the latest version of RST for a specific chipset (or family)?