Instructions for Reverting Your Mac to a Normal Configuration Check that the output from the command reads:.To confirm that your NVRAM settings have been changed, relaunch the Terminal application and type the following command:.Restart your Mac normally, without any keys being pressed.In the Terminal window, type the following command:.In the Finder, select Utilities under the Go menu and then launch the Terminal application.Select “Restart” from the Apple menu to restart your Mac.Successfully disabled System Integrity Protection. Afterward, the Terminal should display this message:.In the Terminal, type the following command:.Launch the Terminal application by selecting it from the Utilities menu. When the menu bar says: “macOS Utilities,” you are booted into Recovery mode.Keep holding the keys down until the Apple logo appears (this may take up to 90 seconds). Restart the computer and then press the Command + R keys simultaneously, once you hear the startup chime.Steps to Change NVRAM so That Hangs Are Prevented Instructions for Preventing the Hang in macOS 10.15.4Ĭhanging the NVRAM setting requires that you disable SIP. I recommend that after you disable SIP and change the setting in NVRAM, you attach a sticky note to your monitor, reminding you to revert these changes once Apple fixes this problem. The instructions at the bottom of this post show you how to revert NVRAM to the original (default) settings and how to re-enable SIP. By disabling SIP, you could be making your Mac more susceptible to malware infections. SIP is a feature of macOS which offers advanced protection from malware. Note: To enable this setting, you will have to disable SIP ( System Integrity Protection). This could result in a 5 – 10% slower read and write performance but will prevent the hang from occurring. One of these debug features allows you to disable the part of macOS which is causing the hang. NVRAM settings are saved in a dedicated chip in your Mac and determines settings such as the audio volume your Mac starts from, the output volume for sound, and which, if any, debugging features are enabled. If you want to prevent this hang, there is a setting in the computer’s NVRAM, which can be changed as a temporary fix. We Discovered a Temporary Work-Around for macOS 10.15.4 We will update this blog post once we have confirmed that this hang has been fixed in a future release of macOS. I can’t say when Apple will release the fix for this problem, but in the past, when they have been alerted to a hang or kernel panic, they had it resolved in the next update to macOS. Once we proved the hang was not a problem with the SoftRAID driver, we alerted Apple engineers to the issue and collected further information to help them with their investigation. We then were able to reproduce the hang on an AppleRAID volume, using the AJA System Test Lite test application. Using a kernel debugger, we determined that the hang was not caused by an error in the SoftRAID driver. Anytime we hear about this type of problem, we immediately start looking for a cause.Ī day later, we were able to reproduce the problem 100% of the time by copying 300 GB of large (10 GB) files from one SoftRAID RAID volume to another. They were having their Macs stall when transferring hundreds of gigabytes of video from their 4K and 8K camera cards to their OWC ThunderBlades and ThunderBays. Investigating the HangĪ few days after the macOS 10.15 update was released, we began to hear of “Finder hangs” from DITs (Digital Imaging Technician) on movie sets. When you encounter the hang we are discussing, you can still move your mouse but are no longer able to copy files. If so, you may have already encountered hangs copying files after you upgraded to macOS 10.15.4. UPDATE: This issue was fixed in macOS 10.15.5Īre you working on a movie set, transferring hundreds of gigabytes from a camera card to a RAID array? Are you a photographer trying to copy a large project from one volume to another?
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