Problem with 2 1 TB external drives

Joined
Jan 24, 2007
Messages
726
Hey guys, I just picked up 2 1 TB Western Digital Essentials external drives and they both work and are recognized when plugged into my PC alone but when they are both plugged in at the same time only one shows up in My Computer. Although, when I go to device manager both drives show up. I'm running windows 7 ultimate and my specs are below. Does anyone know what could be causing this?
 
Anybody? I'd really like to get this fixed I dont want to have to keep switching which one is plugged in to use them.
 
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