I am not sure to have understood everything about bootcamp but here is the situation:

  • I have an internal HD I want to keep.
  • I have an external HD with two partitions:
    • Partition 1: Time machine
    • Partition 2: I want to install Win10 with bootcamp But apparently, this needs to be bootable.

So, are external partitions bootable?

  • Windows will have problems with this configuration. Windows will detect that Windows is being run from an external drive, and adjust itself accordingly. You will not be able to install any major updates, and your product key might not be valid, as booting from external drive requires Windows 10 Enterprise – Matthew Barclay Oct 9 '19 at 1:03

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