It's not. The Boot partition is the partition containing the OS installation not the partition the containing the boot files - blame MS for that naming snafu. The system boots from the system partition, in this case F:
Now normally the boot and system partitions are in the same place but in the OP's case they're not. This is why you should only have one HDD connected when you install Windows, that way you don't get things spread across multiple disks.
Now normally the boot and system partitions are in the same place but in the OP's case they're not. This is why you should only have one HDD connected when you install Windows, that way you don't get things spread across multiple disks.