2008 iMac running OS 10.7.5 doesn't recognize 2 LaCie external drives.

I recently upgraded my iMac's OS from 10.6.8 to 10.7.5.  Now it won't recognize 2 external hard drives.  The 4T LaCie is plugged in to a USB port on the mac.
The 5T LaCie is plugged in to a USB port in a 'Pluggable" USB 2.0 10-port powered hub.  What could be the problem?

Iphone 5 lightning port charging problem - SOLUTION!
- Inspect the dock connector on the iPod for bent or missing contacts, foreign material, corroded contacts, broken, missing or cracked plastic.
- Make an appointment at the Genius Bar of an Apple store.
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