Zourous Posted December 16, 2021 Share Posted December 16, 2021 I have Imac's in our Media Suite with MacOS (recently upgraded to Catalina) and Windows 10 installed on a separate partition.Since the upgrade to Catalina it seems that my Rufus made USB sticks that I boot off into a WinPE (NTFS ISO) using Acronis true image to restore and upgrade the Windows partitions has stopped working.Suspiciously the USB sticks now show up as a Hard drive icon and not as a USB icon like before on the boot screen. When you try to boot you get the "Non bootable device -- insert boot disk..." message The same stick boots fine on another imac with no MacOS or an older MacOS on it.Anyone know what's going on here? I suspect it's something to do with NTFS. I can find content regarding NTFS and newer mac OS's that has changed but that relates to using within mac OS and not booting from it. Quote Link to comment https://www.insanelymac.com/forum/topic/349991-catalina-on-imac-late-2013s-not-booting-usb-sticks/ Share on other sites More sharing options...
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