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QuickLookUIService prevents me from ejecting disk

When I use Finder to view some videos on an SDCard plugged into my macBook Pro, and I then close all Finder and video-player windows, I still can't eject my SDCard. Using the "lsof" command, I noticed that a process called QuickLook still has file descriptors open on folders located on my SDCard, which would explain why the card can't be unmounted. In "ps" the process that won't let go of these files and folders is called "/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/QuickLookUI.framework/Versions/A/XPCServices/QuickLookUIService.xpc/Contents/MacOS/QuickLookUIService".


I can't even terminate that process with "killall QuickLookUIService". Only "killall -9 QuickLookUIService" (or logging out and logging back in again) allows me to eject my SDCard without resorting to "force eject".


What am I doing wrong? Or is this just a bug in QuickLookUIService?


This is on macOS Catalina 10.15.7 on a MacBook Pro (Retina, 13-inch, Early 2013).



MacBook Pro 13″, macOS 10.15

Posted on May 29, 2022 3:39 AM

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Jun 12, 2022 7:22 PM in response to mgk25

QuickLook is the Finder's Preview service for files. So not only when you control-mouse click or right mouse click a file to do QuickLook or use the Finder to do a QuickLook, but also when multi-column Finder is attempting to preview the image for you, the QuickLook service is activated. To avoid all QuickLook, close all Finder windows, and all Open/Save dialog boxes in all open programs before ejecting the SD card. Alternatively if it is still being picky about that, shut down your Mac to remove the SD card.

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QuickLookUIService prevents me from ejecting disk

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