This is an intricate thing to try to describe so here goes. I have 2 Toshiba external hard drives no model number (I assume they are identical). Plugged in one to USB and it was immediately recognized and assigned H drive. Plugged the other into another USB and this one is not recognized at all in the window This PC/Devices and Drives. Same thing if I try all other 5 USB inputs on CPU. The first one stays recognized throughout and all content is accessible. If I unplug the first one and then plug in the second one, the second one is immediately recognized and assigned the H and all content is accessible. Try adding the first one back in, both plugged in at same time, same problem no dice. I leave them both plugged in and I go to control panel/devices and printers. It shows icons for the two external usb 3.0 devices connected. If I right/click on the icons and choose browse files for each it shows exactly the same content (content from whichever device was first device connected). So it appears while it is at some level sensing two devices, when I try to access from the devices and printers window it's treating the two icons as the same device. I also have a Seagate external hard drive. If I plug the Seagate to USB and one of the Toshiba to another USB, they are both recognized and assigned G and H and all content is accessible. So Windows thinking two drives are the same one, is this fixable? I tried renaming one drive (right click/rename in This PC) but it didn't fix it. Also would anyone know were I to buy an external hub and have all three of the external HD thus coming in through one USB slot, if this would fix or get around the problem. thanks for any help