After creating a rescue bootable USB, I've been able to clone both a MacBook Air and an old Toshiba L-300 without a single problem. However, I simply can't start up a late-2009 iMac using the same procedure. The screen turns black and the cursor starts endlessly blinking.
I find it quite surprising, since the iMac has a very simple partitional structure in comparison with my Macbook Air, which has several partitions (hfs+, bootcamp), and the Toshiba, which houses both Windows and Linux partitions.
By the moment being, I am dealing with the issue by using Clonezilla instead, but it's a pain in the neck. R-Drive manages partitions automatically, whereas this process is totally manual with Clonezilla. Thus, hard drives must be managed beforehand using, for instance, gparted, so the whole process becomes clumsier. That's why I finally went for R-Drive.
Thanks from Spain and congratulations on a great tool. I'm loving R-Drive so far