I think I may have identified it by running dmesg -w however I am only a basic beginner at linux. This is what the output was look at what I put in bold from the output. If this is my external hard drive what do I do next? Thanks a lot.
2.553153] usb 1-1: New USB device found, idVendor=13fe, idProduct=6300, bcdDevice= 1.00
[ 2.553162] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 2.553165] usb 1-1: Product: USB DISK 3.0
[ 2.553167] usb 1-1: Manufacturer:
[ 2.553169] usb 1-1: SerialNumber: 07001BCF18F30027
[ 2.679110] usb 1-2: new full-speed USB device number 3 using xhci_hcd
[ 2.830437] usb 1-2: New USB device found, idVendor=1ea7, idProduct=0066, bcdDevice= 2.00
[ 2.830461] usb 1-2: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[ 2.830469] usb 1-2: Product: 2.4G Keyboard & Mouse
[ 2.958991] usb 1-4: new full-speed USB device number 4 using xhci_hcd
[ 3.108500] usb 1-4: New USB device found, idVendor=13d3, idProduct=3529, bcdDevice= 1.10
[ 3.108520] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 3.108528] usb 1-4: Product: Bluetooth Radio
[ 3.108533] usb 1-4: Manufacturer: Realtek
[ 3.108538] usb 1-4: SerialNumber: 00e04c000001
[ 3.239101] usb 1-5: new high-speed USB device number 5 using xhci_hcd
[ 3.414497] usb 1-5: New USB device found, idVendor=0408, idProduct=3046, bcdDevice= 0.03
[ 3.414517] usb 1-5: New USB device strings: Mfr=3, Product=1, SerialNumber=2
[ 3.414524] usb 1-5: Product: USB2.0 VGA UVC WebCam
[ 3.414530] usb 1-5: Manufacturer: Quanta
[ 3.414535] usb 1-5: SerialNumber: 0x0001
[ 3.435810] usb-storage 1-1:1.0: USB Mass Storage device detected
[ 3.438518] scsi host1: usb-storage 1-1:1.0
[ 3.438952] usbcore: registered new interface driver usb-storage