Spotlight won't search external hard drive
I have recently upgraded to Yosemite but when I use Spotlight to search for a file spotlight does not search or include any files on my external hard drive. I have had one community member suggest to explicitly check the Spotlight index via command line. I tried to follow his instructions but my limited skills produced a zero. Unfortunately, he hasn't replied back for further instruction.
Can anyone else please shed some light on this annoying problem?
iMac, OS X Yosemite (10.10.1)