Comment on Carbon Copy Cloner

I was once a big pusher of CCC, and used it for backups regularly. Today I used CCC to copy a smaller external to a larger external HD, and when I returned neither the original disk nor the new one were recognizable by my computer. Why it was necessary to alter the disk being read to copy from it, I don't know. I hope I can recover my files.

Note: running 10.6.2 and CCC 3.3