[edit - sorry but this didn't file in the correct section, and I can't move or delete the post. Would some admin kindly move it to the High Sierra Laptop or Mac OS section, whichever is applicable? Thanks!) Hi All! Thanks for this highly informative forum The Issue: - I've just installed a Gmyle expresscard34 USB3.0 adaptor on a MacBookPro-17" mid-2010, running High Sierra 10.13.2; but it fails to see any USB3 drives connected to the card. - As well, MultiBeast installs FakeSMC.kext and GenericUSBXHCI.kext to /Volumes/Library/Extensions/ - BUT - when FakeSMC.kext is in the /Volumes/Library/Extensions/ folder, the system hangs on startup (click thumbnail to see large pic). - If I move the FakeSMC to a /Unsupported subfolder, the computer boots normally. How I installed: - disabled CSRUtil while in Recovery Mode - In Multibeast ver.10.2.0, under "Quick Start" - selected Legacy Boot Mode - In /Drivers/USB, selected "3rd Party USB 3.0" - In the "Bootloaders" tab, saw that "Clover Legacy Boot Mode" had been pre-selected - In the "Customize" tab, changed the system definition to MacBookPro 6,1 (it was showing as "iMac 14,1") - Build/Install/Reboot. - No luck. Observations: - The installed GenericUSBXHCI.kext appears not to affect booting - Other than the little icon in the menubar (pic), no recognition of the card or any connected USB drives/sticks - I checked the version of FakeSMC is current/latest to the version on RehabMan's cloud repository Question: - How can I get FakeSMC to work? Do I need it? If not, why is the card not recognizing any media? Any help would be greatly appreciated! Art PS: FYI, although I'm somewhat of an initiate with terminal, I can follow instructions, and generally understand what I'm doing.