HP Desktop recognizes usb flash drives but not large external hard drives

suzyduke67

Honorable
Oct 3, 2013
1
0
10,510
My HP desktop will recognize all usb flash drives and I can use them but when I try to use any large external hard drive, 500gb-1tb, the computer shows it, it "sees" it under Devices but not under Computer.

I can't open it or move anything onto it.

I have tried both Western Digital 500gb and 1tb and Iomega 1tb. It does the same for all. I have tried different usb ports

All work on my other computers. All computers OS windows 7

Any advice is appreciated.