Avast free av 4.1,selective hard drive scanning

Hi,we have 2 hard drives on our computer.We notice when avast scans for viruses,it scans both hard drives--doubling the scan time.Is there a setting in avast that we can set to SPECIFY which hard drive to scan?
The second hard drive is a clone of our first and it does`nt have to be scanned every time.We just installed avast 4.1 today and we don`t see a setting for selective hard drive virus scans.
Thank you for any information

 

If you go into folder selection you should be able to uncheck the drive that you don’t want scanned.