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- OS X EL CAPITAN BOOTABLE USB INSTALL
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So my conclusion is that it’s not possible to build a bootable external SSD which has the SAT SMART kext installed to allow checking the health of external SSDs.
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Although the kext was installed in /Library/Extensions, macOS wouldn’t invite me to allow it to be loaded, as my Mac was running from an external SSD.
OS X EL CAPITAN BOOTABLE USB INSTALL
When I tried to install the kext, nothing happened in the Security & Privacy pane. As DriveDx advises, before installing the SAT SMART kext, you must eject all external disks. This is where my plan fell apart, though. Once that’s run, you should be prompted to allow the kernel extension in the General tab of the Security & Privacy pane. In this case, the good folk at Binary Fruit provide an installer from within DriveDx.
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With security downgraded, you can now install the kernel extension. Tick the upper, then set it and restart back into normal user mode.
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Once you have elected to downgrade security there, two options become available: the upper one allows the user to have third-party kernel extensions loaded the lower is the equivalent for remotely managed systems. You next select Options, and once you’ve worked your way to the main Recovery window, select the Startup Security Utility from the menu. That means ensuring you’re running the correct system, shutting down, then starting up with the Power button held to engage Recovery mode. With Monterey, you must do this in the Recovery volume paired with the system you want to downgrade. This has changed in Monterey: in Big Sur, the only Recovery system available was that in its own container on the internal SSD. You have to do those before trying to install a kext, or an app which installs a kext. With my external system up and running, the next step was to downgrade its security and enable the loading of third-party kernel extensions. Sure enough, after reformatting the SSD and running the Installer again, with the SSD connected to a Thunderbolt port the first phase of installation completed successfully, following which came the sequence of black screens and white-on-black progress bars until the new system had to be personalised and configured. Connecting the SSD to one of the Thunderbolt ports is a much better bet. While you might be luckier than me, I wouldn’t bother trying to use one of the front USB-C ports, or one on the back of the Studio Display, for a bootable external disk. There had been no mention of any preparation taking place, and this was an initial installation not an update.Īccording to this notification, the external SSD had been disconnected without being properly ejected, which was news to me as it was still physically connected to the port. This error message is inevitably confused and confusing. The end of the first phase requires long waiting, in which the claimed “about 43 seconds” translates into ten minutes or more. Using the current Monterey 12.3.1 Installer app downloaded from the App Store with a freshly formatted SSD, I launched the installation process as normal, and selected the SSD as its target.Īs expected, this worked through the process of setting the owner of the new bootable system. Having discovered that SATA/USB-C SSDs are faster when connected to either of the front USB-C ports on a Mac Studio Max, that was my starting point. As I’ve lost count of the number of times that I’ve tried doing this over the past year and a bit, it’s now a well-worn path. The first step is to create an external bootable SSD, something I’ve already walked through, although I’m aware of many users who report that they can’t get it to work. So my plan was to build an external bootable SSD which runs at reduced security with SAT SMART installed, and to start up from that when I want to perform periodic checks on those SSDs. To do that on my Mac Studio, I’d have to reduce its security and allow the loading of third-party kernel extensions, something I’m not prepared to do with my production macOS. As several of those connect via USB-C, that means installing the SAT SMART kernel extension. One of my essential tools is DriveDx, which I use to check the health of my many external SSDs.
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I’m now in the middle of the long migration from my trusty iMac Pro to my flashy new Mac Studio Max, complete with its Studio Display.