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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