Hi, I've got a mid-2012 MBP with a 750GB HD. I used CCC to clone the original 750GB to a larger, 1.5TB HD. I swapped the drive and it went smoothly (after I renamed the new drive to have the same name as the og drive so the Home directory could be found). I just checked the used space, and the original drive uses 12GB more space than the new drive. Any reason why this could be? Thanks.