3Tb Hard drive and Bootcamp

Hi everyone.

I recently updated my iMac to a 3Tb hard drive, replacing the old one. Restoring MacOSX partition worked like a charm: I booted using moutain lion installer on an SD card and used disk utility to transfer partitions from the ond disk (in a USB external enclosure) to the new one.

I did the same with the bootcamp partition, but it failed miserably, as the partition isn't recognized anymore when pressing ALT at boot time.

I scavenged the whole Web, searching for a solution. I found out that my problem can't be solved, and that both bootcamp and W7 are guilty. I tried using rEFIt (or rEFInd), it led to the same failure.

Interesting fact: new iMacs can be shipped with a 3Tb hard drive...

The question, summing all my disappointment: has someone succeeded where I failed?

Thanks a lot for your help!