If you have unplugged the USB in which the High Sierra installer is placed, plug it back into your Mac. Once the high sierra installer file has been placed in the USB, open up the terminal application in order to create a boot disk. So let’s dive into how we discovered the MemTest bug, devised a reliable work-around, and get into some nitty gritty details of MemTest86 operation. Install the High Sierra installer with Terminal. Navigate to the macOS High Sierra application page and click the Get button. But there is good news: while normal operation of MemTest86 is limited under these new EFI updates, we also discovered some simple workarounds for testing your Apple’s memory in MemTest86. Connect a 8GB or larger USB key to your computer then launch the Mac App Store from your dock. In short, the newly updated EFI causes MemTest86 to incorrectly fail certain tests. At Beetstech, we use a long-time industry standard, MemTest86 to perform a comprehensive test of each computer’s RAM.īut never the type to blindly accept test results, strange testing outcomes led us to discover a bug in MemTest86 affecting computers running the new EFI firmware. However, these EFI updates can cause some unwanted behavior when you test your Apple computer’s memory. Several of the changes include: the introduction of the Apple File System, support for NVMe drives, and the usual batch of security updates. With macOS 10.13, otherwise known as High Sierra, Apple introduced an ambitious EFI update.
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