When a website's homepage literally doesn't exist, that's usually all you need to know. The domain sedo.keydisk.ru returns a 404 error, meaning the site isn't even running. That alone makes it a non-starter for any legitimate purpose. No business, no blog, no service can function when its front door is missing.
Beyond that, the ownership is completely hidden — the WHOIS database returns no registrant details. For any kind of site that might one day handle user data or transactions, this is a dealbreaker. There are no contact pages, no privacy policy, no terms of service, and no social media presence. There is nothing here to evaluate except what's absent.
The one silver lining is that the domain hasn't been flagged by Google or blacklisted by security services. But that's like saying a boarded-up storefront hasn't been robbed yet — it's not a recommendation. If you came across this domain in any context, from an ad to an email, do not click further. There is no functional website here, and what exists behind the scenes is completely untraceable. Skip it entirely.