I can´t set partition as Active, why?

Why would you need to set an active partition ? there's no BIOS on Wii.

"Active" flag is a way computers use to know which partition you want to boot your OS.
It has zero effect on Wii.

Well, that's not normal you can't do it at all, but if it's only for the Wii, don't worry.

 

After seeing these sorts of posts for the 5,000th time, I've been considering submitting a patch for Nintendont that causes it to only look at active partitions. It seems everyone wants this anti-feature so badly, so might as well implement it. :V

Also, the problem is most likely that the disk is partitioned using GPT. GPT doesn't have a concept of an "active" partition.

 

ahah, I thought about doing it too.

 

The active partition flag is used by the MBR bootloader on IBM PCs (and compatible systems) to determine which partition to boot on startup.

That's it.

Anyone who claims that it's needed for anything on Wii is either lying, incompetent, or intentionally added a check for the active bit for no good reason. (Or added a check because they're tired of people constantly repeating this.)