The external HDD is recognized in device manager, but does not show up in the Disk Management section, nor does my internal HD. If I unplug the External HD then the internal HD shows up in Disk Management. How do I set or turn on the external HDD volume. I tried the solution listed on Nov 19,2012 but after typing in "diskpart" the dialog box opens but I am not able to enter the next command. ???. Help!
The external HD is a new Sony 1TB USB 3.0 model HD-E1
Uninstall the drivers for the External Hard Drive in "Device Manager" and then disconnect the Hard Drive. Restart the computer and then re-connect the Hard Drive. Wait for the drivers to load, now check in the Disk Management if the Hard Drive is detected.
Have you updated the USB 3.0 drivers for your computer? If not, please update the same. If you have difficulty finding the drivers, please reply with the exact Model Number of the computer or the Motherboard in the machine.
From your system description I see that you have a LENOVO desktop IdeaCentre K300. This computer has Two USB 2.0 Front ports and Six USB 2.0 Rear ports. Have you added any add-on cards for USB 3.0 functionality?