MacOS on an external drive, Boot Camp not working!

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Level 1

8 points

MacOS on an external drive, Boot Camp not working!

Everywhere on the Internet people's asking how to install Windows via Boot Camp on an external drive.

My problem is different: I installed Catalina on an external SSD because it's like 400% faster, but I can't proceed with Boot Camp procedure since the first thing it asks me is to remove any external drive.

Which obviously I cannot.

Is there any way around this?

iMac 21.5", macOS 10.14

Posted on Mar 30, 2020 3:06 AM

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Answer 1

Loner T

Level 9

59,536 points

Mar 30, 2020 5:36 AM in response to MatteKingo

What is the year/model of your Mac (do not post the serial number)?

What is the current macOS version?

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Answer 2

MatteKingo Author

Level 1

8 points

Apr 2, 2020 8:59 AM in response to Loner T

iMac (21.5-inch, Late 2015), updated to the latest version of Catalina.

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Answer 3

Loner T

Level 9

59,536 points

Apr 3, 2020 4:02 PM in response to MatteKingo

On your model, OSXRESERVED is created on your macOS disk. When macOS is on external disk, this causes errors.

Install macOS on internal disk, if it does not exist right now.
Disconnect all external storage, run SMC and NVRAM Reset.
Install Windows on the internal disk.
Connect the external macOS disk and boot from it and test.

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MacOS on an external drive, Boot Camp not working!

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