it's called a "mini-usb" and is fairly standard. if it works with your hard drive it should work no problem with your reader.
there are some "mini-usb" connectors that supply power only and they will work for charging, but not for transferring data. they usually come with things like bluetooth headphones. if you plug your reader into these they will charge but you'll be wondering why it doesn't show up on your computer. try a different cable.
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