external hard drive not detected

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http://forums.fedoraforum.org – Hi: A couple of days ago, I put a USB stick drive in my fedora 17.0 linux machine and downloaded some data and it worked fine. But, since then, I've been trying to backup some files using my external hard drive ( iomega ) and it isn't detected. I've gone through iomega technical support and they told me to do as root: modprobe hid modprobe usb-hid modprobe usb-storage then I rebooted but the extermal hard drive is still not detected. I'm pretty certain that this problem has to do with me inserting the usb stick drive a couple of days ago because the external hard drive was alway (HowTos)