Some Mac users running macOS Ventura have reported encountering a series of “operation can’t be completed because an unexpected error occurred” errors when trying to drag and drop files in the Finder from macOS Ventura to a virtual volume, such as those commonly used on a Micro:bit, Raspberry Pi Pico, AdaFruit, CircuitPython / Pyboard, DAPLink, or other RP2040-based boards, and even some USB flash drives.

The complete error message that appears when attempting to drag and drop UF2 or hex files in the Finder to the target volume is typically “The operation can’t be completed because an unexpected error occurred (error code 100093).”, with the same 100093 error code.

However, there is a workaround available for Raspberry Pi Pico users. It involves using the command line cp command to manually copy files through Terminal.

Use this command syntax to copy the file blink.uf2 to the Raspberry Pi volume (if your file or volume has a different name, adjust the syntax accordingly):

cp -X blink.uf2 /Volumes/RPI-RP2/

Since copying files via Terminal works, it suggests that the issue lies within the Finder of MacOS Ventura, and is likely a bug that will be addressed in a future macOS system software update.

If using the command line is inconvenient or not feasible for you, and you frequently use a Raspberry Pi Pico or Micro:bit, you may want to consider avoiding macOS Ventura at this time.

Raspberry Pi has provided the following additional information and speculation about the cause of the problem:

If you connect a Raspberry Pi Pico or another RP2040-based board to a Mac running Ventura, the RPI-RP2 “virtual” volume mounts as expected. Unfortunately, if you attempt to drag-and-drop a UF2 file onto the volume, the process fails and displays a kPOSIXErrorENOATTR (“Attribute not found”) error.

Why is this happening? Our current theory is that Apple has made a change in how the macOS Finder handles extended attributes.

For what it's worth, rsync and pcp also work from the command line for this task.

So if you're working with a Raspberry Pi and experiencing issues with macOS Ventura, and you’re seeing that frustrating “The operation can’t be completed because an unexpected error occurred (error code 100093)” message, turn to the command line for now, and you’ll get things moving again.

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