How do i brig two external hard drives??

I was told you could brig two external hard drives together. i tried to do so but as soon as i connect them to my computer they shut off, does any one know if it can actually be done, if it can how do you do it? i have two Western Digital ( my books).

By "bridge" do you mean just connecting two external hard drives to a computer or do you mean a "RAID" system where they operate as one drive with enough info to rebuild the files if one drive fails?
If you have two unused USB ports on your computer you should be able to connect each drive to a port.
Tracy

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