I know I can't expect quality of SO on SU, but moderators deleting answers for no reason at all? That's going too far.
It's not a duplicate, it's on-topic, it's an valid answer. So why was it deleted?
Your post has been deleted because it doesn't meet up with the quality of a top question.
You are talking about expecting quality, but your answer
Toggle off bootable flag for the Windows partition (fix is obviously turning it on again)
isn't really of any quality as it
Hence, your answer misses quality and is considered to be not constructive and thus not useful.
I really don't see how your answer educates upcoming system administrators...
What Moderation and Stack Exchange are about.
Having moderators decide which answers are good is exact opposite of StackExchange. Moderators of SO know it, moderators of Programmers know it, so do the ones on ServerFault. I can see that here at least 3 moderators totally don't get the idea. If you feel answer is bad, you down vote it, as any other user, not abuse moderator privileges to delete answer, which hadn't had a single down vote.
Not really, one of the tasks of a moderator is to
guide the community. And Stack Exchange is all about learning. So, in order to learn something useful from that question, we need answers that are of quality and not a list of one-liners that are quickly typed out and don't educate the user much. If three moderators totally don't get the idea, feel free to contact the Stack Exchange team. But honestly, I think they did the right thing.
One of the preconditions on the question:
One-liner answers, that fail to explain how they work or what the do, will be converted to comments.
Post was flagged for onliner & insufficient info... and was deleted by me. Also, similar answer was posted prior to your post.