WD320 GB 2.0 USB external hard drive is not working.

Check that the USB cable can provide enough power to the hdd. Check that the USB port is powered. Older USB slots may not have enough power to run larger external HDDs, there you may require separate power to be plugged into the hdd. Are you using the original USB cable provided with the external HDD?

The usb device not recognized error generally means the right drivers are not present on the computer. I would expect that Windows 7 can recognize most external HDD automatically, but you might need to install a driver for it.
But try the disk on a different USB port, or even computer, to see if it still works properly.

Probably not the right answer for your problem. Mine is an external 1 TB Simple Drive. Mine wouldn't respond at all. I unplugged the power cable from the back of the hard drive and replugged it in and instantly it worked. I had tried rebooting the computer, plugging/unplugging over and over into the computer and that didn't work.

Some usb input ports on dvd players, projectors, etc. have a limit to what size it will read from. Right now it's usually 4 gb to 32 gb.

have you try with the other usb cable and the usb port.

check the Hdd on a another usb slots uninstall and reinstall the drivers and also check the usb compatibilty if it is 2.0 or not

hi ,

looks like u primary hard drive is inside the laptop and so should be displayed as c : drive ,

and the reason , the external hard drive is not displayed seperately is csue ., the external HD  may be added as slave to the internal HD .,

can u tell me ,make a right click on c:/ drive and choose properties : and tell the totalsize dispalyed 

My External HDD of Western Digital (500 GB) not detecting by Win-XP SP-2. But at the same machine another External HDD of Western Digital (160 GB) is detecting and functioning well.
What is the problem? & what to do to get back my necessary files stored in the 500 GB HDD.
Can any one help me, please? URGENT.My External HDD of Western Digital (500 GB) not detecting by Win-XP SP-2. But at the same machine another External HDD of Western Digital (160 GB) is detecting and functioning well.
What is the problem? & what to do to get back my necessary files stored in the 500 GB HDD.
Can any one help me, please? URGENT.

I have a Western External Hard Drive 320 and when I plug it in the computer will recognize it and allow me to access my files but after a short while if I go to click on a file t open it the WD 320 will click off for a minute and then reappear in the auto run mode.

Yes. The case doesn't care what size the drive is. The computer is just asking for the USB driver for the case. Check the WD site for the driver for the model of MyBook that you have. That should cover it.