I have few external USB 3 Hard Drives 2 - 5 TB which don't mount. I have tried different power sources, USB-cables and USB-ports. Disk Utility don't see but System Information, lsusb and ls sees drives. All drives turn led on and some spins plates but some not. Is there any app or unix thing which can mount these or can copy data out? MBPR 10.13.5.