Then, restart your Mac and slowly replug the external drive into your Mac to check if it shows up in your Finder this time. You can unplug the external drive and wait a moment. Sometimes, the disk may be checked by the OS prior to mounting fully. A temporary bug or slow reaction of the operating system can prevent the external drive from showing up on your Mac. Maybe there are no problems with the USB cables and ports. Restart your Mac and reconnect the external drive slowly and deliberately Therefore, if you can't find the external drive on your Mac, check to see if the external hard disk is properly connected with the following steps:ġ. But if the connection fails, your external drive won't be recognized in macOS Monterey or any other OS for that matter. Fix 1: Check the connections of the external hard driveĮxternal hard drives like the Buffalo MiniStation, WD, Samsung, Seagate, and Lacie are connected to Mac using USB cables and ports. If you don't know where to start, just follow the step-by-step guide below to find and access an external hard drive on your Mac. Or, it is triggered by your hidden settings. As the differences are not clear, feel free to try them out, to see which one works best for your hardware.As mentioned earlier, sometimes, a hard drive not showing up on Mac is caused by an unrecognized file system. For some models no hardware test could be found, while others seem to have multiple AHT. Note that there is no one-to-one correspondence between hardware model and AHT. To convert it to a newer format, open Disk Utility, in the menu Images click on Convert and select the dmg to convert and save it under a new name. When trying to open an old dmg you may get the error 'legacy image should be converted'. This is also the preferred way on OS X 10.11 or later, where the System Integrity Protection (SIP) no longer allows writing to system folders. Alternatively you may try with a bootable USB stick, as described below. The rest were obtained by scraping for all the links of the form 0(18|22)-\d'ĭownload the AHT for your computer model and use the contents to restore the /System/Library/CoreServices/.diagnostics folder, then reboot while holding d to start the diagnostic tools. Various blogs and forums, mostly Riven by Five and MacForum.ro have gathered a list of download links. It happens that Apple provides disk images with AHT for most computers, but does not make the links publicly available. Unless you have the original disks that came with your computer, there seems to be no way to restore the AHT. If however, you reinstalled an older computer from scratch, the diagnostic tools might no longer be available. Consult the reference codes to interpret the results. Apple redesigned the AHT, now called Apple Diagnostics, for Macs introduced after June 2013. Refer to the official Apple documentation for details: Using AHT on Intel-based Macs, Mountain Lion, Mavericks and Yosemite. Newer models support holding option d to load AHT over the internet. In principle you can start them by holding the d key while booting. Perhaps my Terminal commands are wrong?Īpple computers ship with a pre-installed suite of hardware diagnostic tools, known as Apple Hardware Test (AHT). I haven't been able to place this "invisible" file the the folder. Several Terminal attempts to move this file also fail diagnostics folder in System/Library/CoreServices, so after determining the model and board ID,Ĭommand-Shift-Dot reveals the. Tried again using option-D during restart, same result. Result:Įrror: 0x8000000000000003, Cannot load 'EFI/Driver/TestSupport.efi'Įthernet cable connected. While on wifi, I tried to run Apple Hardware Test with a restart while pressing D and it would not load. I ran Safe Boot, and First Aid from Disk Utility, SMART status was verified. It could not put some simple screenshots in the trash. Sometimes Finder windows will leave the topmost item out of reach unless the window is expanded. Cannot run Apple Hardware Test, MBPr, High Sierra 10.13.6 My MBPr has been acting a bit funky lately.
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