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Win10 version 1903 beta upgrade halted if you have a plugged-in USB drive or SD card
Catalin Cimpanu at ZDNet reported on this yesterday:
Microsoft has published a support document today warning Windows 10 users that the impending May 2019 Update may not install on their systems if they use external USB storage devices or SD cards.
The OS maker cited problems with “inappropriate drive reassignment” as the main reason for blocking the May 2019 Update.
The solution’s simple: Yank the USB drive or SD card, if you can.
The block only happens on 1803 – to 1903 and 1809 – to -1903 upgrades. And you don’t have to worry about it unless you’re trying to upgrade as part of the Insider Program, or using one of the MSDN copies.
Thx @abbodi86