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An external storage-device has four major components:
* the USB cable
* the power-adapter
* the disk-drive inside the enclosure
* the USB-to-disk-drive adapter inside the enclosure.
One of these components has failed.
Try a different USB cable.
Try connecting to a different USB port on your computer.
Try connecting to a USB port on a different computer.
Take a "multi-meter" and measure both the voltage and amperage output from the AC adapter, and compare with the specifications on the label on the adapter.
Open the enclosure, and remove the disk-drive, and then connect it as a "slave" disk-drive in a desktop computer, to see if it works at all.
Purchase a new, compatible, disk-drive, and install it in the enclosure, to "revive" your external storage device.
Get the part-number and serial-number from the label on your disk-drive, and access the manufacturer's web-site, and use "check warranty status", to see if they will replace the device, at minimal cost to you.
Note that W.D. has a "Customer Loyalty" program -- you can buy a new W.D. device, through the W.D. web-site, at a significant discount.
Not sure how new your computer is but on some older ones there is not enough power from just one USB port to power the drive correctly. If your drive spins up (sounds like it is revving up) then you should be getting enough power but if not then you will need to purchase a Y USB cable to properly power the drive.
I had this same issue. Found it to be a sequencing issue. Plug the USB into the router with the power off to the HDD. Power on the HDD and you should be able to get to it fine. Also make sure you have the latest firmware on the router.
In general, you need to install the correct drivers for the enclosure, not for the hard disk. Seeing as you have XP Pro, this is probably unnecessary though.
Also, 0.7A is 700 mA, and this exceeds the USB port maximum current which is 500 mA.
Most (not all!) laptop drives will run even if under a slight undercurrent, but this depends on USB port electronics and enclosure electronics.
Chances are that you won't be able to run the disk unless you plug it into an externally powered USB hub supplying at least 750 mA per port. The 100-500 mA supplied by your PC's USB port is enough to power the enclosure electronics and the host controller, but not enough to get the HD to spin properly. As a result, the HD can not be initialised and the enclosure will report an error.
Some hard disk enclosures come with a "USB Y Cable" or "double power cable" which joins two USB ports to get double the current, and can support HD up to 1.0A. If your enclosure comes with one of them, try that first.
Most portable HDDs show up without drivers being required, so, assuming other drives or USB devices show up the general assumption is that either the circuit board in the enclosure has failed or the HDD has failed.
Assuming it doesn't work on other PCs and that other USB devices do, take the external drive to your local computer shop and ask to have the drive tested and moved into a new enclosure. If the drive is OK then the people at the computer store can simply transfer the drive into a new enclosure and it will work. If it fails testing you will likely need to send the drive to a Pro, I would recommend Armor-IT Data Recovery(listed in the FixYa directory).
You can swap the enclosures yourself if you have basic hand tools and are feeling handy but it might be nice to have the techs at the local shop test the drive.
If you need any further instructions add a comment on this post and included the make and model# of the failed external drive and I will offer further assistance.
It's probably NOT the voltage, but the current available at a given USB port. You might try using a USB cable that has two "A" connectors on one end that connect to the computer, one for power and data, the other is just for extra power. The other end of the cable should have the appropriate connector for your external drive. By connecting the second "A" plug to the computer, you double the current available to the external drive.