Just got a new 27” 5K iMac. I transferred about two thousand photos, via USB flash drive , from a W7 machine to the iMac. The total file size on the drive was 32GB. After the transfer, the total file size on the iMac was about 2GB????? Also, all the TIFF files were converted to JPEG??? I want to transfer CS6, including about three thousand more photos to the new Mac, will I encounter problems???