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boot up and "mark partitition as active"

In "computer management", under "disk management" in Windows Server 2003, i meant to "change drive letters and paths", and accidentally clicked on "mark partition as active".  The partition I marked as active is an extrernal disk.  I am afraid that on reboot, my server won't boot up.  As of now, my PC is still on, and is working as usual.  

How do I unmark the external disk as the active partition?  Will my system boot up and work normally if I don't unmark it?

As always, thank you for your time.    
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favoretti
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I'd mark the "real" active partition as active again and remove the active flag from the external disk.
If you can't remove the external flag, don't worry, your server is still configured to use internal disk as a primary boot device, so that's where it will look for active partition. It doesn't normally search for "all available active partitions".

favoretti
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The "mark active partition" option for the system boot partition is greyed out.
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... the only impact having the active partition on the external drive will have is IF you were to change the boot order and put the external disk ahead of the internal disks, the system would attempt to boot from the external disk (since it has an active partition).
Thanks to favoretti for the answer, and garycase for the great explanation.