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I have 2 identical Western Digital WDBACW0030HBK USB 3.0 hard drives.

My computer will read drive #1 when its plugged in by itself, it gets assigned drive letter X My computer will read drive #2 when its plugged in by itself, it gets assigned letter x too

But when I plug them both in, it will only show one of them in My Computer, and not both

Whats the deal?

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Do you have the WD software installed? – Dave M Mar 22 '12 at 1:24
Are there enough free drive letters? Does it matter in which order you plug them in? – Synetech Mar 22 '12 at 1:30
Doesnt matter what order I plug them in. I installed the WD SES Driver for x64. I read the drive only keeps the popups from appearing though. I did not install the WD SmartWare Setup, which I think is just some software used to back stuff up with. – Joshua Hazel Mar 22 '12 at 1:34
Do both USB ports share a spot on the motherboard, and does one of them require less power? – soandos Mar 22 '12 at 1:35
Both USB drive have their own power supply, and both USB ports are on the same USB controller – Joshua Hazel Mar 22 '12 at 1:35
up vote 1 down vote accepted

Go into Disk Management and look for a hdd listed as "offline" right click on it and select "online" and then it will appear in My Computer... problem solved

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